desi-EXPID

Summary:

Raw data from the DESI spectrographs, with one fpack-compressed HDU per spectrograph camera, plus additional telemetry data.

Naming Convention:

desi-EXPID.fits.fz, where EXPID is the zero-padded 8-digit exposure ID.

Regex:

desi-[0-9]{8}\.fits\.fz

File Type:

FITS, 500 MB

Contents

There is one HDU per spectrograph camera with EXTNAMEs like B0, B1, … R0, R1, … Z8, Z9. The structure of each of these is the same; only one is explicitly documented below. These could appear in any order and individual cameras could be missing from a data file depending upon the state of the hardware and the ICS configuration.

Number	EXTNAME	Type	Contents
HDU00		IMAGE	Empty HDU
HDU01	SPEC	Compressed IMAGE	Global header keywords
HDU02	Z0	Compressed IMAGE	Raw data from the Z0 spectrograph
HDU03 – HDU31	various	Compressed IMAGE	Raw data similar to Z0 spectrograph.
HDU32	SPECTCONS	BINTABLE	Telemetry data

FITS Header Units

HDU00

This HDU has no non-standard required keywords.

Empty HDU.

Early commissioning data and simulated data may have had EXTNAME = SPS as well as header keywords that now appear in HDU01.

HDU01

EXTNAME = SPEC

This HDU should be treated as the primary HDU. In particular, this HDU contains header keywords that should be treated as belonging to the entire file.

The data contents are a dummy payload that should not be used. The dummy value is typically [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] in compressed format.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	8	int	width of table in bytes
NAXIS2	1	int	number of rows in table
BZERO	32768	int	offset data range to that of unsigned short
BSCALE	1	int	default scaling factor
MODULE	CI	str	Image Sources/Component
EXPID	118526	int	Exposure number
EXPFRAME	0	int	Frame number
FRAMES	None	Unknown	Number of Frames in Archive
COSMSPLT	T	bool	Cosmics split exposure if true
MAXSPLIT	0	int	Number of allowed exposure splits
VISITIDS [1]	118524,118525,118526	str	List of expids for a visit (same tile)
TILEID [1]	4403	int	DESI Tile ID
FIBASSGN [1]	/data/tiles/SVN_tiles/004/fiberassign-004403.fits.gz	str	Fiber assign
FLAVOR	science	str	Observation type
OBSTYPE	SCIENCE	str	Spectrograph observation type
SEQUENCE	_Split	str	OCS Sequence name
MANIFEST	F	bool	DOS exposure manifest
OBJECT		str	Object name
PURPOSE	Main Survey	str	Purpose of observing night
PROGRAM	DARK	str	Program name
NTSSURVY	main	str	NTS survey name
NTSPROG [1]	DARK	str	NTS program name
SBPROF [1]	ELG	str	Profile used by ETC
MAXTIME [1]	5400.0	float	[s] Maximum exposure time for entire visit (fro
ESTTIME [1]	3705.79	float	[s] Estimated exposure time for visit (from ETC
MINTIME [1]	300.0	float	[s] Minimum exposure time (from NTS, used by ET
MIDTIME [1]	915.0	float	[s] Exposure midpoint time used by PlateMaker
PROPID	2020B-5000	str	Proposal ID
OBSERVER	Jessica Chellino, Corentin Ravoux	str	Names of observers
LEAD	Martin Landriau	str	Lead observer
INSTRUME	DESI	str	Instrument name
OBSERVAT	KPNO	str	Observatory name
OBS-LAT	31.96403	str	[deg] Observatory latitude
OBS-LONG	-111.59989	str	[deg] Observatory east longitude
OBS-ELEV	2097.0	float	[m] Observatory elevation
TELESCOP	KPNO 4.0-m telescope	str	Telescope name
CORRCTOR	DESI Corrector	str	Corrector Identification
SEQID	5 requests	str	Exposure sequence identifier
SEQNUM	1	int	Number of exposure in sequence
SEQTOT	5	int	Total number of exposures in sequence
NIGHT	20220113	int	Observing night
SEQSTART	2022-01-14T11:03:08.447408	str	Start time of sequence processing
TIMESYS	UTC	str	Time system used for date-obs
DATE-OBS	2022-01-14T11:04:17.830044160	str	[UTC] Observation data and start tim
TIME-OBS	2022-01-14T11:04:17.830044160	str	[UTC] Observation start time
MJD-OBS	59593.461317476	float	Modified Julian Date of observation
STARTADJ [1]	2022-01-14T11:03:22.140652	str	Time sequence starts adjusting the inst
OPENSHUT	2022-01-14T11:04:18.577390	str	Time shutter opened
CAMSHUT	open	str	Shutter status during observation
ST	11:13:28.582000	str	Local Sidereal time at observation start (HH:MM
EXPTIME	579.1588	float	[s] Actual exposure time
DELTARA		float	[arcsec] Offset], right ascension, observer inp
DELTADEC		float	[arcsec] Offset], declination, observer input
ACQTIME [1]	15.0	float	[s] acqusition image exposure time
GUIDTIME [1]	5.0	float	[s] guider GFA exposure time
FOCSTIME [1]	60.0	float	[s] focus GFA exposure time
SKYTIME [1]	60.0	float	[s] sky camera exposure time (acquisition)
REQRA [1]	170.239	float	[deg] Requested right ascension (observer input
REQDEC [1]	-7.093	float	[deg] Requested declination (observer input)
WHITESPT	F	bool	Telescope is at whitespot
ZENITH	F	bool	Telescope is at zenith
SEANNEX	F	bool	Telescope is at SE annex
BEYONDP	F	bool	Telescope is beyond pole
FIDUCIAL	off	str	Fiducials status during observation
BACKLIT [1]	off	str	Fibers are backlit if True
AIRMASS	1.287912	float	Airmass
FOCUS	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
VCCD [1]	ON	str	True (ON) if CCD voltage is on
TRUSTEMP [1]	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP [1]	11.675	float	[deg] Average primary mirror temperature (nit,e
PMREADY	T	bool	Primary mirror ready
PMCOVER [1]	open	str	Primary mirror cover
PMCOOL [1]	off	str	Primary mirror cooling
DOMSHUTU [1]	open	str	Upper dome shutter
DOMSHUTL [1]	open	str	Lower dome shutter
DOMLIGHH [1]	off	str	High dome lights
DOMLIGHL [1]	off	str	Low dome lights
DOMEAZ	180.062	float	[deg] Dome azimuth angle
DOMINPOS	T	bool	Dome is in position
EPOCH	2000.0	float	Epoch of observation
GUIDOFFR	-0.659376	float	[arcsec] Cummulative guider offset (RA)
GUIDOFFD	0.003783	float	[arcsec] Cummulative guider offset (dec)
SUNRA	296.151203	float	[deg] Sun RA at start of exposure
SUNDEC	-21.264137	float	[deg] Sun declination at start of exposure
MOONDEC	23.960888	float	[deg] Moon declination at start of exposure
MOONRA	73.944051	float	[deg] Moon RA at start of exposure
MOONSEP	99.032	float	[deg] Moon Separation
MOUNTAZ	176.725567	float	[deg] Mount azimuth angle
MOUNTDEC	-7.102329	float	[deg] Mount declination
MOUNTEL	50.883914	float	[deg] Mount elevation angle
MOUNTHA	-2.081118	float	[deg] Mount hour angle
INCTRL	T	bool	DESI in control
INPOS	T	bool	Mount in position
MNTOFFD	75.86	float	[arcsec] Mount offset (dec)
MNTOFFR	-31.1	float	[arcsec] Mount offset (RA)
PARALLAC	-2.510103	float	[deg] Parallactic angle
SKYDEC	-7.102329	float	[deg] Telescope declination (pointing on sky)
SKYRA	170.24163	float	[deg] Telescope right ascension (pointing on sk
TARGTDEC	-7.102329	float	[deg] Target declination (to TCS)
TARGTRA	170.24163	float	[deg] Target right ascension (to TCS)
TARGTAZ	177.063681	float	[deg] Target azimuth
TARGTEL	50.893802	float	[deg] Target elevation
TRGTOFFD	0.0	float	[arcsec] Telescope target offset (dec)
TRGTOFFR	0.0	float	[arcsec] Telescope target offset (RA)
ZD	39.106198	float	[deg] Telescope zenith distance
TILERA [1]	170.239	float	RA of tile given in fiberassign file
TILEDEC [1]	-7.093	float	DEC of tile given in fiberassign file
TCSST	11:13:30.164	str	Local Sidereal time reported by TCS (HH:MM:SS)
TCSMJD	59593.461771	float	MJD reported by TCS
USETURB [1]	T	bool	Turbulence corrections are applied if true
USEETC [1]	T	bool	ETC data available if true
REQTEFF [1]	1000.0	float	[s] Requested effective exposure time
ACTTEFF [1]	1.113899	float	[s] Actual effective exposure time
TOTTEFF [1]	936.3194	float	[s] Total effective exposure time for visit
SEEING	None	Unknown	[arcsec] ETC/PM seeing
TRANSPAR	None	Unknown	ETC/PM transparency
SKYLEVEL [1]	7.516	float	[unit?] PM/ETC sky level
PMSEEING	None	Unknown	[arcsec] PlateMaker GFAPROC seeing
PMTRANSP	None	Unknown	[%] PlateMaker GFAPROC transparency
ETCSEENG [1]	1.1695	float	[arcsec] ETC seeing
ETCTEFF [1]	1.113899	float	[s] ETC effective exposure time
ETCREAL [1]	580.104492	float	[s] ETC real open shutter time
ETCPREV [1]	454.940948	float	[s] ETC cummulative t_eff for visit
ETCSPLIT [1]	3	int	ETC split sequence number for this visit
ETCPROF [1]	ELG	str	ETC source brightness profile
ETCTRANS [1]	0.10543	float	ETC avg. TRANSP normalized to 1
ETCTHRUP [1]	0.10793	float	ETC avg. thruput (PSF profile)
ETCTHRUE [1]	0.10457	float	ETC avg. thruput (ELG profile)
ETCTHRUB [1]	0.101061	float	ETC avg. thruput (BGS profile)
ETCFRACP [1]	0.575305	float	ETC transp. weighted avg. FFRAC (PSF)
ETCFRACE [1]	0.408837	float	ETC transp. weighted avg. FFRAC (ELG)
ETCFRACB [1]	0.181983	float	ETC transp. weighted avg. FFRAC (BGS)
ETCSKY [1]	6.882767	float	ETC averaged, normalized sky camera flux
ACQFWHM [1]	1.169528	float	[arcsec] FWHM of guide star PSF in acq. image
ACQCAM [1]	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM [1]	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM [1]	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM [1]	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
REQADC [1]	334.05,26.06	str	[deg] requested ADC angles
ADCCORR	T	bool	Correct pointing for ADC setting if True
ADC1PHI	334.049995	float	[deg] ADC 1 angle
ADC2PHI	26.058728	float	[deg] ADC 2 angle
ADC1HOME	F	bool	ADC 1 at home position if True
ADC2HOME	F	bool	ADC 2 at home position if True
ADC1NREV	-1.0	float	ADC 1 number of revs
ADC2NREV	1.0	float	ADC 2 number of revs
ADC1STAT	STOPPED	str	ADC 1 status
ADC2STAT	STOPPED	str	ADC 2 status
USESKY [1]	T	bool	DOS Control: use Sky Monitor
USEFOCUS [1]	T	bool	DOS Control: use focus
HEXPOS	946.7,-231.6,-83.4,-18.3,9.9,138.8	str	Hexapod position
HEXTRIM	0.0,0.0,0.0,0.0,0.0,0.0	str	Hexapod trim values
USEROTAT [1]	T	bool	DOS Control: use rotator
ROTOFFST	138.8	float	[arcsec] Rotator offset
ROTENBLD	T	bool	Rotator enabled
ROTRATE	0.513	float	[arcsec/min] Rotator rate
RESETROT	F	bool	DOS Control: reset hex rotator
SPLITEXP [1]	T	bool	Split exposure part of a visit
USESPLIT [1]	T	bool	Exposure splits are allowed
USEPOS [1]	T	bool	Fiber positioner data available if true
PETALS [1]	PETAL0,PETAL1,PETAL2,PETAL3,PETAL4,PETAL5,PETAL6,PETAL7,PETAL8,PETAL9	str	Participating petals
POSCYCLE [1]	None	Unknown	Number of current iteration
POSONTGT [1]	None	Unknown	Number of positioners on target
POSONFRC [1]	None	Unknown	Fraction of positioners on target
POSDISAB [1]	None	Unknown	Number of disabled positioners
POSENABL [1]	None	Unknown	Number of enabled positioners
POSRMS [1]	None	Unknown	[mm] RMS of positioner accuracy
POSITER [1]	1	int	Positioning Control: max. number of pos. cycles
POSFRACT [1]	0.95	float
POSTOLER [1]	0.005	float	Positioning Control: in_position tolerance (mm)
POSMVALL [1]	T	bool	Positioning Control: move all positioners
USEGUIDR [1]	T	bool	DOS Control: use guider
GUIDMODE	catalog	str	Guider mode
USEAOS [1]	T	bool	DOS Control: AOS data available if true
USEDONUT [1]	T	bool	DOS Control: use donuts
USESPCTR [1]	T	bool	DOS Control: use spectrographs
SPCGRPHS	SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9	str	Participating spectrograph
ILLSPECS	SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9	str	Participating illuminate s
CCDSPECS	SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9	str	Participating ccd spectrog
TDEWPNT [1]	-32.86	float	Telescope air dew point
TAIRFLOW [1]	0.0	float	Telescope air flow
TAIRITMP [1]	12.5	float	[deg] Telescope air in temperature
TAIROTMP [1]	12.7	float	[deg] Telescope air out temperature
TAIRTEMP [1]	11.05	float	[deg] Telescope air temperature
TCASITMP [1]	6.6	float	[deg] Telescope Cass Cage in temperature
TCASOTMP [1]	12.2	float	[deg] Telescope Cass Cage out temperature
TCSITEMP [1]	12.1	float	[deg] Telescope center section in temperature
TCSOTEMP [1]	12.3	float	[deg] Telescope center section out temperature
TCIBTEMP [1]	0.0	float	[deg] Telescope chimney IB temperature
TCIMTEMP [1]	0.0	float	[deg] Telescope chimney IM temperature
TCITTEMP [1]	0.0	float	[deg] Telescope chimney IT temperature
TCOSTEMP [1]	0.0	float	[deg] Telescope chimney OS temperature
TCOWTEMP [1]	0.0	float	[deg] Telescope chimney OW temperature
TDBTEMP [1]	12.4	float	[deg] Telescope dec bore temperature
TFLOWIN [1]	0.0	float	Telescope flow rate in
TFLOWOUT [1]	0.0	float	Telescope flow rate out
TGLYCOLI [1]	12.8	float	[deg] Telescope glycol in temperature
TGLYCOLO [1]	12.6	float	[deg] Telescope glycol out temperature
THINGES [1]	12.1	float	[deg] Telescope hinge S temperature
THINGEW [1]	22.3	float	[deg] Telescope hinge W temperature
TPMAVERT [1]	11.658	float	[deg] Telescope mirror averagetemperature
TPMDESIT [1]	6.0	float	[deg] Telescope mirror desired temperature
TPMEIBT [1]	12.1	float	[deg] Telescope mirror EIB temperature
TPMEITT [1]	11.5	float	[deg] Telescope mirror EIT temperature
TPMEOBT [1]	12.3	float	[deg] Telescope mirror EOB temperature
TPMEOTT [1]	12.0	float	[deg] Telescope mirror EOT temperature
TPMNIBT [1]	11.9	float	[deg] Telescope mirror NIB temperature
TPMNITT [1]	11.4	float	[deg] Telescope mirror NIT temperature
TPMNOBT [1]	12.3	float	[deg] Telescope mirror NOB temperature
TPMNOTT [1]	12.0	float	[deg] Telescope mirror NOT temperature
TPMRTDT [1]	11.67	float	[deg] Telescope mirror RTD temperature
TPMSIBT [1]	12.1	float	[deg] Telescope mirror SIB temperature
TPMSITT [1]	11.5	float	[deg] Telescope mirror SIT temperature
TPMSOBT [1]	12.0	float	[deg] Telescope mirror SOB temperature
TPMSOTT [1]	11.7	float	[deg] Telescope mirror SOT temperature
TPMSTAT [1]	ready	str	Telescope mirror status
TPMWIBT [1]	11.9	float	[deg] Telescope mirror WIB temperature
TPMWITT [1]	11.3	float	[deg] Telescope mirror WIT temperature
TPMWOBT [1]	11.9	float	[deg] Telescope mirror WOB temperature
TPMWOTT [1]	11.8	float	[deg] Telescope mirror WOT temperature
TPCITEMP [1]	12.1	float	[deg] Telescope primary cell in temperature
TPCOTEMP [1]	12.0	float	[deg] Telescope primary cell out temperature
TPR1HUM [1]	0.0	float	Telescope probe 1 humidity
TPR1TEMP [1]	0.0	float	[deg] Telescope probe1 temperature
TPR2HUM [1]	0.0	float	Telescope probe 2 humidity
TPR2TEMP [1]	0.0	float	[deg] Telescope probe2 temperature
TSERVO [1]	40.0	float	Telescope servo setpoint
TTRSTEMP [1]	11.9	float	[deg] Telescope top ring S temperature
TTRWTEMP [1]	11.7	float	[deg] Telescope top ring W temperature
TTRUETBT [1]	-1.5	float	[deg] Telescope truss ETB temperature
TTRUETTT [1]	11.6	float	[deg] Telescope truss ETT temperature
TTRUNTBT [1]	11.7	float	[deg] Telescope truss NTB temperature
TTRUNTTT [1]	11.6	float	[deg] Telescope truss NTT temperature
TTRUSTBT [1]	11.7	float	[deg] Telescope truss STB temperature
TTRUSTST [1]	10.8	float	[deg] Telescope truss STS temperature
TTRUSTTT [1]	11.7	float	[deg] Telescope truss STT temperature
TTRUTSBT [1]	12.2	float	[deg] Telescope truss TSB temperature
TTRUTSMT [1]	12.2	float	[deg] Telescope truss TSM temperature
TTRUTSTT [1]	12.2	float	[deg] Telescope truss TST temperature
TTRUWTBT [1]	11.6	float	[deg] Telescope truss WTB temperature
TTRUWTTT [1]	11.6	float	[deg] Telescope truss WTT temperature
ALARM [1]	F	bool	UPS major alarm or check battery
ALARM-ON [1]	F	bool	UPS active alarm condition
BATTERY [1]	100.0	float	[%] UPS Battery left
SECLEFT [1]	6312.0	float	[s] UPS Seconds left
UPSSTAT	System Normal - On Line(7)	str	UPS Status
INAMPS [1]	68.3	float	[A] UPS total input current
OUTWATTS [1]	4800.0,7200.0,4500.0	str	[W] UPS Phase A, B, C output watts
COMPDEW [1]	-10.3	float	[deg C] Computer room dewpoint
COMPHUM [1]	13.9	float	[%] Computer room humidity
COMPAMB [1]	25.2	float	[deg C] Computer room ambient temperature
COMPTEMP [1]	17.6	float	[deg C] Computer room hygrometer temperature
DEWPOINT [1]	-36.9	float	[deg C] (outside) dewpoint
HUMIDITY [1]	2.0	float	[%] (outside) humidity
PRESSURE [1]	793.2	float	[torr] (outside) air pressure
OUTTEMP [1]	11.0	float	[deg C] outside temperature
WINDDIR [1]	264.5	float	[deg] wind direction
WINDSPD [1]	11.7	float	[m/s] wind speed
GUST [1]	10.8	float	[m/s] Wind gusts speed
AMNIENTN [1]	16.8	float	[deg C] ambient temperature north
CFLOOR [1]	11.6	float	[deg C] temperature on C floor
NWALLIN [1]	17.3	float	[deg C] temperature at north wall inside
NWALLOUT [1]	11.1	float	[deg C] temperature at north wall outside
WWALLIN [1]	16.5	float	[deg C] temperature at west wall inside
WWALLOUT [1]	11.5	float	[deg C] temperature at west wall outside
AMBIENTS [1]	17.6	float	[deg C] ambient temperature south
FLOOR [1]	15.7	float	[deg C] temperature at floor (LCR)
EWALLCMP [1]	11.9	float	[deg C] temperature at east wall, computer room
EWALLCOU [1]	11.6	float	[deg C] temperature at east wall, Coude room
ROOF [1]	10.9	float	[deg C] temperature on roof
ROOFAMB [1]	11.1	float	[deg C] ambient temperature on roof
DOMEBLOW [1]	11.2	float	[deg C] temperature at dome back, lower
DOMEBUP [1]	11.3	float	[deg C] temperature at dome back, upper
DOMELLOW [1]	11.1	float	[deg C] temperature at dome left, lower
DOMELUP [1]	10.9	float	[deg C] temperature at dome left, upper
DOMERLOW [1]	11.1	float	[deg C] temperature at dome right, lower
DOMERUP [1]	10.7	float	[deg C] temperature at dome right, upper
PLATFORM [1]	10.6	float	[deg C] temperature at platform
SHACKC [1]	16.7	float	[deg C] temperature at shack ceiling
SHACKW [1]	16.6	float	[deg C] temperature at shack wall
STAIRSL [1]	10.9	float	[deg C] temperature at stairs, lower
STAIRSM [1]	10.7	float	[deg C] temperature at stairs, mid
STAIRSU [1]	10.9	float	[deg C] temperature at stairs, upper
TELBASE [1]	11.6	float	[deg C] temperature at telescope base
UTILWALL [1]	11.4	float	[deg C] temperature at utility room wall
UTILROOM [1]	10.1	float	[deg C] temperature in utilitiy room
SP0NIRT [1]	139.96	float	[K] SP0 NIR temperature
SP0REDT [1]	139.99	float	[K] SP0 red temperature
SP0BLUT [1]	163.02	float	[K] SP0 blue temperature
SP0NIRP [1]	7.36e-08	float	[mb] SP0 NIR pressure
SP0REDP [1]	5.492e-08	float	[mb] SP0 red pressure
SP0BLUP [1]	1.001e-07	float	[mb] SP0 blue pressure
SP1NIRT [1]	139.96	float	[K] SP1 NIR temperature
SP1REDT [1]	139.96	float	[K] SP1 red temperature
SP1BLUT [1]	163.02	float	[K] SP1 blue temperature
SP1NIRP [1]	6.622e-08	float	[mb] SP1 NIR pressure
SP1REDP [1]	6.033e-08	float	[mb] SP1 red pressure
SP1BLUP [1]	8.599e-08	float	[mb] SP1 blue pressure
SP2NIRT [1]	139.96	float	[K] SP2 NIR temperature
SP2REDT [1]	139.96	float	[K] SP2 red temperature
SP2BLUT [1]	163.02	float	[K] SP2 blue temperature
SP2NIRP [1]	5.556e-08	float	[mb] SP2 NIR pressure
SP2REDP [1]	6.013e-08	float	[mb] SP2 red pressure
SP2BLUP [1]	8.897e-08	float	[mb] SP2 blue pressure
SP3NIRT [1]	140.03	float	[K] SP3 NIR temperature
SP3REDT [1]	139.96	float	[K] SP3 red temperature
SP3BLUT [1]	163.04	float	[K] SP3 blue temperature
SP3NIRP [1]	4.3e-08	float	[mb] SP3 NIR pressure
SP3REDP [1]	7.066e-08	float	[mb] SP3 red pressure
SP3BLUP [1]	8.324e-08	float	[mb] SP3 blue pressure
SP4NIRT [1]	139.96	float	[K] SP4 NIR temperature
SP4REDT [1]	139.99	float	[K] SP4 red temperature
SP4BLUT [1]	163.04	float	[K] SP4 blue temperature
SP4NIRP [1]	6.921e-08	float	[mb] SP4 NIR pressure
SP4REDP [1]	4.505e-08	float	[mb] SP4 red pressure
SP4BLUP [1]	6.846e-08	float	[mb] SP4 blue pressure
SP5NIRT [1]	139.99	float	[K] SP5 NIR temperature
SP5REDT [1]	139.99	float	[K] SP5 red temperature
SP5BLUT [1]	163.02	float	[K] SP5 blue temperature
SP5NIRP [1]	7.886e-08	float	[mb] SP5 NIR pressure
SP5REDP [1]	4.383e-08	float	[mb] SP5 red pressure
SP5BLUP [1]	1.003e-07	float	[mb] SP5 blue pressure
SP6NIRT [1]	139.96	float	[K] SP6 NIR temperature
SP6REDT [1]	139.96	float	[K] SP6 red temperature
SP6BLUT [1]	163.04	float	[K] SP6 blue temperature
SP6NIRP [1]	2.688e-07	float	[mb] SP6 NIR pressure
SP6REDP [1]	6.65e-08	float	[mb] SP6 red pressure
SP6BLUP [1]	9.062e-08	float	[mb] SP6 blue pressure
SP7NIRT [1]	139.96	float	[K] SP7 NIR temperature
SP7REDT [1]	140.03	float	[K] SP7 red temperature
SP7BLUT [1]	162.97	float	[K] SP7 blue temperature
SP7NIRP [1]	6.073e-08	float	[mb] SP7 NIR pressure
SP7REDP [1]	4.807e-08	float	[mb] SP7 red pressure
SP7BLUP [1]	1.066e-07	float	[mb] SP7 blue pressure
SP8NIRT [1]	139.96	float	[K] SP8 NIR temperature
SP8REDT [1]	139.96	float	[K] SP8 red temperature
SP8BLUT [1]	163.04	float	[K] SP8 blue temperature
SP8NIRP [1]	1.257e-07	float	[mb] SP8 NIR pressure
SP8REDP [1]	4.635e-08	float	[mb] SP8 red pressure
SP8BLUP [1]	8.912e-08	float	[mb] SP8 blue pressure
SP9NIRT [1]	139.96	float	[K] SP9 NIR temperature
SP9REDT [1]	139.96	float	[K] SP9 red temperature
SP9BLUT [1]	163.02	float	[K] SP9 blue temperature
SP9NIRP [1]	5.325e-08	float	[mb] SP9 NIR pressure
SP9REDP [1]	6.124e-08	float	[mb] SP9 red pressure
SP9BLUP [1]	1.236e-07	float	[mb] SP9 blue pressure
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
SIMGFAP [1]	F	bool	DOS Control: simulate GFAPROC
USEFVC [1]	T	bool	DOS Control: use fvc
USEFID [1]	T	bool	DOS Control: use fiducials
USEILLUM [1]	T	bool	DOS Control: use illuminator
USEXSRVR [1]	T	bool	DOS Control: use exposure server
USEOPENL [1]	T	bool	DOS Control: use open loop move
USEMIDPT [1]	T	bool	Use exposure midpoint if true
STOPGUDR [1]	T	bool	DOS Control: stop guider
STOPFOCS [1]	T	bool	DOS Control: stop focus
STOPSKY [1]	T	bool	DOS Control: stop sky monitor
KEEPGUDR [1]	F	bool	DOS Control: keep guider running
KEEPFOCS [1]	F	bool	DOS Control: keep focus running
KEEPSKY [1]	F	bool	DOS Control: keep sky mon. running
REACQUIR [1]	F	bool	DOS Control: reacquire same files
FILENAME	/exposures/desi/20220113/00118526/desi-00118526.fits.fz	str	Name of (F
EXCLUDED		str	Components excluded from this exposure
DOSVER	trunk	str	DOS software version
OCSVER	1.2	float	OCS software version
PMVER [1]	desi-138368	str	PlateMaker/Dervish version
ETCVERS [1]	0.1.14	str	ETC version
CONSTVER	DESI:CURRENT	str	Constants version
INIFILE	/data/msdos/dos_home/architectures/kpno/desi.ini	str	DOS Configuration
REQTIME	1860.0	float	[s] Requested exposure time
SIMGFACQ [1]	F	bool
TCSKRA	0.01 0.04 0.01	str	TCS Kalman (RA)
TCSKDEC	0.01 0.04 0.01	str	TCS Kalman (dec)
TCSGRA	0.15	float	TCS simple gain (RA)
TCSGDEC	0.15	float	TCS simple gain (dec)
TCSMFRA	2	int	TCS moving filter length (RA)
TCSMFDEC	2	int	TCS moving filter length (dec)
TCSPIRA	0.9,0.0,0.0,0.0	str	TCS PI settings (P, I (gain, error window, satu
TCSPIDEC	0.9,0.0,0.0,0.0	str	TCS PI settings (P, I (gain, error window, satu
GUIEXPID [1]	118526	int	Guider exposure id at start of spectro exp.
IGFRMNUM [1]	2	int	Guider frame number at start of spectro exp.
FOCEXPID [1]	118526	int	Focus exposure id at start of spectro exp.
IFFRMNUM [1]	0	int	Focus frame number at start of spectro exp.
SKYEXPID [1]	118526	int	Sky exposure id at start of spectro exp.
ISFRMNUM [1]	0	int	Sky frame number at start of spectro exp.
FGFRMNUM [1]	72	int	Guider frame number at end of spectro exp.
FFFRMNUM [1]	9	int	Focus frame number at end of spectro exp.
FSFRMNUM [1]	7	int	Sky frame number at end of spectro exp.
ETCSKYLV [1]	7.8081	float	[unit?] ETC skylevel
CHECKSUM	OlYZPlXZOlXZOlXZ	str	HDU checksum updated 2022-01-14T11:15:03
DATASUM	306780459	str	data unit checksum updated 2022-01-14T11:15:03

[1] (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,257,258,259,260,261,262,263,264,265,266,267,268,269,270,271,272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287,288,289,290,291,292,293,294,295,296,297,298,299,300,301,302,303,304,305,306,307,308,309,310,311,312,313,314,315,316,317,318,319,320,321,322,323,324)

Optional

Data: FITS image [int16 (compressed), 10]

HDU02

EXTNAME = Z0

Unprocessed spectrograph raw data, including overscans, from camera Z0.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	8	int	width of table in bytes
NAXIS2	4194	int	number of rows in table
BZERO	32768	int	offset data range to that of unsigned short
BSCALE	1	int	default scaling factor
EXPID	118526	int	Exposure number
EXPFRAME	0	int	Frame number
FRAMES [1]	None	Unknown	Number of Frames in Archive
TILEID [1]	4403	int	DESI Tile ID
FIBASSGN [1]	/data/tiles/SVN_tiles/004/fiberassign-004403.fits.gz	str	Fiber assign
FLAVOR	science	str	Observation type
SEQUENCE	_Split	str	OCS Sequence name
PURPOSE	Main Survey	str	Purpose of observing night
PROGRAM	DARK	str	Program name
PROPID	2020B-5000	str	Proposal ID
OBSERVER	Jessica Chellino, Corentin Ravoux	str	Names of observers
LEAD	Martin Landriau	str	Lead observer
INSTRUME	DESI	str	Instrument name
OBSERVAT	KPNO	str	Observatory name
OBS-LAT	31.96403	str	[deg] Observatory latitude
OBS-LONG	-111.59989	str	[deg] Observatory east longitude
OBS-ELEV	2097.0	float	[m] Observatory elevation
TELESCOP	KPNO 4.0-m telescope	str	Telescope name
CORRCTOR	DESI Corrector	str	Corrector Identification
NIGHT	20220113	int	Observing night
TIMESYS	UTC	str	Time system used for date-obs
DATE-OBS	2022-01-14T11:04:17.790636032	str	[UTC] Observation data and start tim
TIME-OBS	2022-01-14T11:04:17.790636032	str	[UTC] Observation start time
MJD-OBS	59593.46131702	float	Modified Julian Date of observation
OPENSHUT	2022-01-14T11:04:18.577390	str	Time shutter opened
ST	11:13:28.540000	str	Local Sidereal time at observation start (HH:MM
EXPTIME	579.193	float	[s] Actual exposure time
DELTARA		float	[arcsec] Offset], right ascension, observer inp
DELTADEC		float	[arcsec] Offset], declination, observer input
REQRA [1]	170.239	float	[deg] Requested right ascension (observer input
REQDEC [1]	-7.093	float	[deg] Requested declination (observer input)
FOCUS [1]	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
VCCD	ON	str	True (ON) if CCD voltage is on
VCCDON	2022-01-10T20:55:43.758808	str	Time when CCD voltage was turned on
VCCDSEC	310751.8	float	[s] CCD on time in seconds
TRUSTEMP [1]	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP [1]	11.675	float	[deg] Average primary mirror temperature (nit,e
EPOCH	2000.0	float	Epoch of observation
MOUNTAZ [1]	176.725567	float	[deg] Mount azimuth angle
MOUNTDEC [1]	-7.102329	float	[deg] Mount declination
MOUNTEL [1]	50.883914	float	[deg] Mount elevation angle
MOUNTHA [1]	-2.081118	float	[deg] Mount hour angle
SKYDEC [1]	-7.102329	float	[deg] Telescope declination (pointing on sky)
SKYRA [1]	170.24163	float	[deg] Telescope right ascension (pointing on sk
TARGTDEC [1]	-7.102329	float	[deg] Target declination (to TCS)
TARGTRA [1]	170.24163	float	[deg] Target right ascension (to TCS)
USEETC [1]	T	bool	ETC data available if true
USESKY [1]	T	bool	DOS Control: use Sky Monitor
USEFOCUS [1]	T	bool	DOS Control: use focus
HEXTRIM [1]	0.0,0.0,0.0,0.0,0.0,0.0	str	Hexapod trim values
USEROTAT [1]	T	bool	DOS Control: use rotator
ROTOFFST [1]	138.8	float	[arcsec] Rotator offset
ROTENBLD [1]	T	bool	Rotator enabled
ROTRATE [1]	0.513	float	[arcsec/min] Rotator rate
USEGUIDR [1]	T	bool	DOS Control: use guider
USEDONUT [1]	T	bool	DOS Control: use donuts
SPECGRPH	0	int	Spectrograph logical name (SP)
SPECID	4	int	Spectrograph serial number (SM)
FEEBOX	lbnl082	str	CCD Controller serial number
VESSEL	17	int	Cryostat serial number
FEEVER	v20160312	str	CCD Controller version
DETFLVER	FAILED: invalid argument for get command	str	CCD Controller detector f
FEEPOWER	ON	str	FEE power status
FEEDMASK	2134851391	int	FEE dac mask
FEECMASK	1048575	int	FEE clk mask
CCDTEMP	-137.5647	float	[deg C] CCD controller CCD temperature
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
DOSVER	trunk	str	DOS software version
OCSVER	1.2	float	OCS software version
CONSTVER	DESI:CURRENT	str	Constants version
INIFILE	/data/msdos/dos_home/architectures/kpno/desi.ini	str	DOS Configuration
CAMERA	z0	str	Camera name
DAC2	-9.0002,-8.8271	str	[V] set value, measured value
DATASECA	[8:2064, 2:2065]	str	Data section for quadrant A
CLOCK6	9.9999,0.0	str	[V] high rail, low rail
DIGITIME	56.4524	float	[s] Time to digitize image
DAC17	20.0008,11.834	str	[V] set value, measured value
CLOCK15	9.9992,2.9993	str	[V] high rail, low rail
DETSECB	[2058:4114, 1:2064]	str	Detector section for quadrant B
CLOCK0	9.9999,0.0	str	[V] high rail, low rail
CRYOPRES	7.360e-08	str	[mb] Cryostat pressure (IP)
AMPSECC	[1:2057, 4128:2065]	str	AMP section for quadrant C
CCDTMING	flatdark_lbnl_timing.txt	str	CCD timing file
CLOCK8	9.9992,2.9993	str	[V] high rail, low rail
CLOCK4	9.9999,0.0	str	[V] high rail, low rail
PRESECB	[4250:4256, 2:2065]	str	Prescan section for quadrant B
DAC1	-9.0002,-8.8683	str	[V] set value, measured value
PRRSECC	[8:2064, 4194:4194]	str	Row prescan section for quadrant C
DAC10	-25.0003,-24.7976	str	[V] set value, measured value
OFFSET2	0.4000000059604645,-8.8271	str	[V] set value, measured value
CLOCK14	9.9992,2.9993	str	[V] high rail, low rail
DAC16	39.9961,39.039	str	[V] set value, measured value
ORSECB	[2193:4249, 2066:2097]	str	Row overscan section for quadrant B
AMPSECA	[1:2057, 1:2064]	str	AMP section for quadrant A
DAC14	0.0,0.1039	str	[V] set value, measured value
DAC11	-25.0003,-24.0556	str	[V] set value, measured value
CLOCK7	-2.0001,3.9999	str	[V] high rail, low rail
PGAGAIN	3	int	Controller gain
ORSECA	[8:2064, 2066:2097]	str	Row overscan section for quadrant A
DAC15	0.0,0.089	str	[V] set value, measured value
DETSECD	[2058:4114, 2065:4128]	str	Detector section for quadrant D
ORSECD	[2193:4249, 2098:2129]	str	Row bias section for quadrant D
OFFSET0	0.4000000059604645,-8.7962	str	[V] set value, measured value
OFFSET6	2.0,6.0911	str	[V] set value, measured value
PRRSECD	[2193:4249, 4194:4194]	str	Row prescan section for quadrant D
DAC13	0.0,0.1187	str	[V] set value, measured value
OFFSET3	0.4000000059604645,-8.8786	str	[V] set value, measured value
AMPSECD	[4114:2058, 4128:2065]	str	AMP section for quadrant D
DAC9	-25.0003,-24.946	str	[V] set value, measured value
DELAYS	20, 20, 25, 40, 7, 3000, 7, 7, 400, 7	str	[10] Delay settings
SETTINGS	detectors_sm_20210128.json	str	Name of DESI CCD settings file
DETSECA	[1:2057, 1:2064]	str	Detector section for quadrant A
CLOCK5	9.9999,0.0	str	[V] high rail, low rail
PRRSECB	[2193:4249, 1:1]	str	Row prescan section for quadrant B
DETECTOR	M1-53	str	Detector (ccd) identification
CLOCK12	9.9992,2.9993	str	[V] high rail, low rail
DAC12	0.0,0.1039	str	[V] set value, measured value
TRIMSECA	[8:2064, 2:2065]	str	Trim section for quadrant A
DATASECB	[2193:4249, 2:2065]	str	Data section for quadrant B
CDSPARMS	400, 400, 8, 2000	str	CDS parameters
TRIMSECC	[8:2064, 2130:4193]	str	Trim section for quadrant C
DAC3	-9.0002,-8.8683	str	[V] set value, measured value
BIASSECA	[2065:2128, 2:2065]	str	Bias section for quadrant A
TRIMSECB	[2193:4249, 2:2065]	str	Trim section for quadrant B
CASETEMP	60.1833	float	[deg C] CCD controller case temperature
CPUTEMP	59.5781	float	[deg C] CCD controller CPU temperature
OFFSET5	2.0,6.0806	str	[V] set value, measured value
CCDSECD	[2058:4114, 2065:4128]	str	CCD section for quadrant D
CCDNAME	CCDSM4Z	str	CCD name
DAC4	5.9998,6.0648	str	[V] set value, measured value
BLDTIME	0.3529	float	[s] Time to build image
CLOCK13	9.9992,2.9993	str	[V] high rail, low rail
CLOCK1	9.9999,0.0	str	[V] high rail, low rail
PRESECA	[1:7, 2:2065]	str	Prescan section for quadrant A
CCDSIZE	4194,4256	str	CCD size in pixels (rows, columns)
DATASECC	[8:2064, 2130:4193]	str	Data section for quadrant C
CLOCK18	9.0,0.9999	str	[V] high rail, low rail
CLOCK10	9.9992,2.9993	str	[V] high rail, low rail
CRYOTEMP	139.962	float	[deg K] Cryostat CCD temperature
CLOCK3	-2.0001,3.9999	str	[V] high rail, low rail
DAC0	-9.0002,-8.7962	str	[V] set value, measured value
CCDSECA	[1:2057, 1:2064]	str	CCD section for quadrant A
CLOCK11	9.9992,2.9993	str	[V] high rail, low rail
CLOCK2	9.9999,0.0	str	[V] high rail, low rail
CLOCK9	9.9992,2.9993	str	[V] high rail, low rail
CLOCK17	9.0,0.9999	str	[V] high rail, low rail
ORSECC	[8:2064, 2098:2129]	str	Row overscan section for quadrant C
CCDSECC	[1:2057, 2065:4128]	str	CCD section for quadrant C
PRESECD	[4250:4256, 2130:4193]	str	Prescan section for quadrant D
BIASSECD	[2129:2192, 2130:4193]	str	Bias section for quadrant D
AMPSECB	[4114:2058, 1:2064]	str	AMP section for quadrant B
CCDCFG	default_lbnl_20210128.cfg	str	CCD configuration file
BIASSECB	[2129:2192, 2:2065]	str	Bias section for quadrant B
BIASSECC	[2065:2128, 2130:4193]	str	Bias section for quadrant C
CLOCK16	9.9999,3.0	str	[V] high rail, low rail
CCDPREP	purge,clear	str	CCD prep actions
DAC8	-25.0003,-24.8273	str	[V] set value, measured value
PRRSECA	[8:2064, 1:1]	str	Row prescan section for quadrant A
DATASECD	[2193:4249, 2130:4193]	str	Data section for quadrant D
DAC5	5.9998,6.0806	str	[V] set value, measured value
PRESECC	[1:7, 2130:4193]	str	Prescan section for quadrant C
OFFSET1	0.4000000059604645,-8.8786	str	[V] set value, measured value
OFFSET4	2.0,6.0595	str	[V] set value, measured value
DAC7	5.9998,5.9964	str	[V] set value, measured value
DAC6	5.9998,6.0963	str	[V] set value, measured value
OFFSET7	2.0,5.9911	str	[V] set value, measured value
DETSECC	[1:2057, 2065:4128]	str	Detector section for quadrant C
TRIMSECD	[2193:4249, 2130:4193]	str	Trim section for quadrant D
CCDSECB	[2058:4114, 1:2064]	str	CCD section for quadrant B
REQTIME	1860.0	float	[s] Requested exposure time
OBSID	kp4m20220114t110417	str	Unique observation identifier
PROCTYPE	RAW	str	Data processing level
PRODTYPE	image	str	Data product type
CHECKSUM	mqJSonIQmnIQmnIQ	str	HDU checksum updated 2022-01-14T11:15:05
DATASUM	3453799606	str	data unit checksum updated 2022-01-14T11:15:05

Data: FITS image [int16 (compressed), 4256x4194]

HDU03 – HDU31

EXTNAME = B0, R0, B1, R1, Z1, B2, R2, Z2, B3, R3, Z3, B4, R4, Z4, B5, R5, Z5, B6, R6, Z6, B7, R7, Z7, B8, R8, Z8, B9, R9, Z9

Data: See Z0.

Note: any combination of B0..Z9 could exist in any order.

HDU32

EXTNAME = SPECTCONS

This is a telemetry table. This table contains variable-length arrays, whose length depends on the exact number of HDUs included in this file.

Note: this is the last HDU, but its exact number will depend upon the number of cameras in included in the file.

The smid column is not present for exposures before expid 172920.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	352	int	width of table in bytes
NAXIS2	10	int	number of rows in table
EXPID	118526	int	Exposure number
EXPFRAME	0	int	Frame number
FRAMES [1]	None	Unknown	Number of Frames in Archive
TILEID [1]	4403	int	DESI Tile ID
FIBASSGN [1]	/data/tiles/SVN_tiles/004/fiberassign-004403.fits.gz	str	Fiber assign
FLAVOR	science	str	Observation type
SEQUENCE	_Split	str	OCS Sequence name
PURPOSE	Main Survey	str	Purpose of observing night
PROGRAM	DARK	str	Program name
PROPID	2020B-5000	str	Proposal ID
OBSERVER	Jessica Chellino, Corentin Ravoux	str	Names of observers
LEAD	Martin Landriau	str	Lead observer
INSTRUME	DESI	str	Instrument name
OBSERVAT	KPNO	str	Observatory name
OBS-LAT	31.96403	str	[deg] Observatory latitude
OBS-LONG	-111.59989	str	[deg] Observatory east longitude
OBS-ELEV	2097.0	float	[m] Observatory elevation
TELESCOP	KPNO 4.0-m telescope	str	Telescope name
CORRCTOR	DESI Corrector	str	Corrector Identification
NIGHT	20220113	int	Observing night
TIMESYS	UTC	str	Time system used for date-obs
DELTARA		float	[arcsec] Offset], right ascension, observer inp
DELTADEC		float	[arcsec] Offset], declination, observer input
REQRA [1]	170.239	float	[deg] Requested right ascension (observer input
REQDEC [1]	-7.093	float	[deg] Requested declination (observer input)
FOCUS [1]	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
TRUSTEMP [1]	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP [1]	11.675	float	[deg] Average primary mirror temperature (nit,e
EPOCH	2000.0	float	Epoch of observation
MOUNTAZ [1]	176.725567	float	[deg] Mount azimuth angle
MOUNTDEC [1]	-7.102329	float	[deg] Mount declination
MOUNTEL [1]	50.883914	float	[deg] Mount elevation angle
MOUNTHA [1]	-2.081118	float	[deg] Mount hour angle
SKYDEC [1]	-7.102329	float	[deg] Telescope declination (pointing on sky)
SKYRA [1]	170.24163	float	[deg] Telescope right ascension (pointing on sk
TARGTDEC [1]	-7.102329	float	[deg] Target declination (to TCS)
TARGTRA [1]	170.24163	float	[deg] Target right ascension (to TCS)
USEETC [1]	T	bool	ETC data available if true
USESKY [1]	T	bool	DOS Control: use Sky Monitor
USEFOCUS [1]	T	bool	DOS Control: use focus
HEXTRIM [1]	0.0,0.0,0.0,0.0,0.0,0.0	str	Hexapod trim values
USEROTAT [1]	T	bool	DOS Control: use rotator
ROTOFFST [1]	138.8	float	[arcsec] Rotator offset
ROTENBLD [1]	T	bool	Rotator enabled
ROTRATE [1]	0.513	float	[arcsec/min] Rotator rate
USEGUIDR [1]	T	bool	DOS Control: use guider
USEDONUT [1]	T	bool	DOS Control: use donuts
SPCGRPHS	SP4, SP9, SP8, SP2, SP0, SP5, SP7, SP6, SP1, SP3	str	Participating spe
DEVICES	SPECTCON4, SPECTCON9, SPECTCON8, SPECTCON2, SPECTCON0, SPECTCON5, SPECTCON7, SPECTCON6, SPECTCON1, SPECTCON3	str	Participating devices (spectro controller)
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
DOSVER	trunk	str	DOS software version
OCSVER	1.2	float	OCS software version
CONSTVER	DESI:CURRENT	str	Constants version
INIFILE	/data/msdos/dos_home/architectures/kpno/desi.ini	str	DOS Configuration
REQTIME	1860.0	float	[s] Requested exposure time
OBSID	kp4m20220114t110417	str	Unique observation identifier
PROCTYPE	RAW	str	Data processing level
PRODTYPE	image	str	Data product type
CHECKSUM	0YhA1VZ30VfA0VZ3	str	HDU checksum updated 2022-01-14T11:15:09
DATASUM	2915472531	str	data unit checksum updated 2022-01-14T11:15:09

Required Data Table Columns

Name	Type	Units	Description
unit	int64		spectrograph ID (SP notation)
specid	int64		spectrograph ID (SP notation)
smid [1]	int64		spectrograph hardware ID (SM notation)
EXPTIME [1]	float64	s	exposure time for this spectrograph
DATE-OBS	char stream		timestamp (date and time of observation for this spectrograph)
TIME-OBS	char stream		timestamp (time of observation for this spectrograph)
MJD-OBS	float64	d	MJD time of observation for this spectrograph
ST	char stream		timestamp (local sidereal time for this spectrograph)
OPENSHUT [1]	char stream		timestamp (shutter open time for this spectrograph)
CLOSSHUT [1]	float64	s	time to close shutter for this spectrograph
OBSID	char stream		unique identifier for this exposure
STATUS	char stream		Overall spectro-controller status
HARTL	char stream		Status of left Hartmann door (open, closed, error)
HARTLP	char stream		Left Hartmann door power (on, off, error)
HARTR	char stream		Status of right Hartmann door (open, closed, error)
HARTRP	char stream		Right Hartmann door power (on, off, error)
WAGO	char stream		Status of WAGO PLC (ready, error)
NIRSHUT	char stream		Status of NIR shutter (open, closed, error)
NIRSEAL	char stream		NIR shutter seal (inflated, deflated, error)
NIRPOW	char stream		NIR shutter power (ON, OFF)
EXPSHUT	char stream		Status of EXP shutter (open, closed, error)
EXPSEAL	char stream		EXP shutter seal (inflated, deflated, error)
EXPPOW	char stream		EXP shutter power (ON, OFF)
ILLUM	char stream		Fiber illuminator (on, off, notready, ready, error, flashing)
ZTEMP	float64		[degrees] NIR camera temperature
ZHUMID	float64		[%] NIR camera humidity
BTEMP	float64		[degrees] blue camera temperature
BHUMID	float64		[%] blue camera humidity
RTEMP	float64		[degrees] red camera temperature
RHUMID	float64		[%] red camera humidity
IEBTEMP	float64		[degrees] electronics board temperature
COLLTEMP	float64		[degrees] enclosure temperature near collimator
CRYOTEMP	float64		[degrees] enclosure temperature near cryostat
BZTEMP	float64		[degrees] enclosure temperature near NIR shutter
MIRROR	char stream		Serial number for this hardware component
MOUNT	char stream		Serial number for this hardware component
EXPMEC	char stream		Serial number for this hardware component
ZDICHR	char stream		Serial number for this hardware component
NIRMEC	char stream		Serial number for this hardware component
RDICHR	char stream		Serial number for this hardware component
BVPHG	char stream		Serial number for this hardware component
ZVPHG	char stream		Serial number for this hardware component
RVPHG	char stream		Serial number for this hardware component
BCAM	char stream		Serial number for this hardware component
ZCAM	char stream		Serial number for this hardware component
RCAM	char stream		Serial number for this hardware component

Notes and Examples

Known Issues

• The compressed SPEC HDU contains the ZSIMPLE keyword. This would be appropriate in a compressed primary HDU but not in a compressed extension.

• Some header keywords contain empty values. These will produce warnings when files of this type are examined with fitsverify.

Provenance

• 2019-02-21: Revised based on headers from spectrograph functional verification files.

• 2019-04-03: Revised based on raw data files created from spectrograph functional verification files.

• 2023-03-21: Revised in preparation for first public data release.