focus-EXPID

Summary:

Raw images from focus cameras.

Naming Convention:

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

Regex:

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

File Type:

FITS, 91 MB

Contents

Number	EXTNAME	Type	Contents
HDU0	FOCUS	Empty HDU	Header keywords only
HDU1	FOCUS4	Compressed IMAGE	Focus image 4
HDU2	FOCUS4T	BINTABLE	Focus image 4 metadata
HDU3	FOCUS1	Compressed IMAGE	Focus image 1
HDU4	FOCUS1T	BINTABLE	Focus image 1 metadata
HDU5	FOCUS9	Compressed IMAGE	Focus image 9
HDU6	FOCUS9T	BINTABLE	Focus image 9 metadata
HDU7	FOCUS6	Compressed IMAGE	Focus image 6
HDU8	FOCUS6T	BINTABLE	Focus image 6 metadata

Raw images from focus cameras. The data are deliberately out of focus with one half positive out of focus and the other half negative. There is a region in between that vignetted by the filter holder.

The FOCUSn data will be 3D[nframes, ny, nx] such that data[i] is the 2D GFA frame number i. Row i of the FOCUSnT table will contain the metadata about that frame, e.g. the DATE-OBS and EXPTIME.

Note that other than the blank data primary HDU, the order of the other HDUs is arbitrary and some FOCUSn(T) HDUs may even be missing. The nominal set (1,4,6,9) is the plan for full DESI, but particularly during commissioning other combinations will appear in the data. Always access by EXTNAME not HDU number.

Other than the name and number of the HDUs, the structure of this format is identical to the guide GFA raw data.

FITS Header Units

HDU0

EXTNAME = FOCUS

Header keywords only.

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
MODULE	FOCUS	str	Image Sources/Component
EXPID	118526	int	Exposure number
FRAMES	9	int	Number of Frames in Archive
TILEID	4403	int	DESI Tile ID
FLAVOR	science	str	Observation type
PURPOSE	Main Survey	str	Purpose of observing night
PROGRAM	DARK	str	Program name
NIGHT	20220113	int	Observing night
ACQTIME	None	Unknown	[s] acqusition image exposure time
GUIDTIME	None	Unknown	[s] guider GFA exposure time
FOCSTIME	60.0	float	[s] focus GFA exposure time
SKYTIME	None	Unknown	[s] sky camera exposure time (acquisition)
REQRA	170.239	float	[deg] Requested right ascension (observer input
REQDEC	-7.093	float	[deg] Requested declination (observer input)
DELTARA	0.0	float	[arcsec] Offset], right ascension, observer inp
DELTADEC	0.0	float	[arcsec] Offset], declination, observer input
FOCUS	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
TRUSTEMP	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP	11.675	float	[deg] Average primary mirror temperature (nit,e
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)
ACQCAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
ADC1PHI	None	Unknown	[deg] ADC 1 angle
ADC2PHI	None	Unknown	[deg] ADC 2 angle
HEXPOS	946.7,-231.6,-83.4,-18.3,9.9,138.8	str	Hexapod position
DOSVER	trunk	str	DOS software version
CONSTVER	DESI:CURRENT	str	Constants version
ARCHIVE	/exposures/desi/20220113/00118526/focus-00118526.fits.fz	str
CHECKSUM	FAA2H992FAA2F772	str	HDU checksum updated 2022-01-14T11:13:59
DATASUM	0	str	data unit checksum updated 2022-01-14T11:13:59

Empty HDU.

HDU1

EXTNAME = FOCUS4

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	8	int	width of table in bytes
NAXIS2	9288	int	number of rows in table
ZTILE3	1	int	size of tiles to be compressed
BZERO	32768	int	offset data range to that of unsigned short
BSCALE	1	int	default scaling factor
DEVICE	FOCUS4	str	Device/controller name
UNIT	4	int	Unit number/letter
UNITTYPE	FOCUS	str	Image Sources/Component
EXPID	118526	int	Exposure number
FRAMES	9	int	Number of Frames in Archive
TILEID	4403	int	DESI Tile ID
FIBASSGN	/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	2022-01-14T11:03:58.542861	str	[UTC] Observation data and start time
MJD-OBS	59593.46109425	float	Modified Julian Date of observation
OPENSHUT	2022-01-14T11:03:58.542861	str	Time shutter opened
ST	11:14:12.2376	str	Local Sidereal time at observation start (HH:MM
FOCSTIME	60.0	float	[s] focus GFA exposure time
REQRA	170.239	float	[deg] Requested right ascension (observer input
REQDEC	-7.093	float	[deg] Requested declination (observer input)
DELTARA	None	Unknown	[arcsec] Offset], right ascension, observer inp
DELTADEC	None	Unknown	[arcsec] Offset], declination, observer input
FOCUS	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
TRUSTEMP	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP	11.675	float	[deg] Average primary mirror temperature (nit,e
EPOCH	2000.0	float	Epoch of observation
EQUINOX	2000.0	float	Equinox of selected coordinate reference frame
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
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)
USEETC	T	bool	ETC data available if true
ACQCAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
ADC1PHI	None	Unknown	[deg] ADC 1 angle
USESKY	T	bool	DOS Control: use Sky Monitor
USEFOCUS	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	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
USEGUIDR	T	bool	DOS Control: use guider
USEDONUT	T	bool	DOS Control: use donuts
WCSAXES	2	int
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
CTYPE1	RA—TAN	str
CTYPE2	DEC–TAN	str
CD1_1	5.6335e-05	float
CD1_2	1.6773e-05	float
CD2_1	1.8252e-05	float
CD2_2	-5.1774e-05	float
SHAPE	1032,2248	str
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
ADCPHI2	None	Unknown
ROI	None	Unknown
ROIWIDTH	None	Unknown
GEXPMODE	normal	str	GFA readout mode (loop/normal)
DEVICEID	dev07	str	GFA device id (serial number)
REQTIME	1860.0	float	[s] Requested exposure time
CHECKSUM	4hDA7hAA4hAA4hAA	str	HDU checksum updated 2022-01-14T11:13:59
DATASUM	1294762993	str	data unit checksum updated 2022-01-14T11:13:59

Data: FITS image [int16 (compressed), 2248x1032x9]

HDU2

EXTNAME = FOCUS4T

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	242	int	width of table in bytes
NAXIS2	9	int	number of rows in table
CHECKSUM	RNb1SLa0RLa0RLa0	str	HDU checksum updated 2022-01-14T11:13:59
DATASUM	1194419227	str	data unit checksum updated 2022-01-14T11:13:59

Required Data Table Columns

Name	Type	Units	Description
EXPTIME	float64		TODO: description needed
REQTIME	float64		TODO: description needed
NIGHT	int64		TODO: description needed
DATE-OBS	char[*]		TODO: description needed
TIME-OBS	char[*]		TODO: description needed
MJD-OBS	float64		TODO: description needed
OPENSHUT	char[*]		TODO: description needed
ST	char[*]		TODO: description needed
HEXPOS	char[*]		TODO: description needed
GAMBNTT	float64		TODO: description needed
GFPGAT	float64		TODO: description needed
GFILTERT	float64		TODO: description needed
GCOLDTEC	float64		TODO: description needed
GHOTTEC	float64		TODO: description needed
GCCDTEMP	float64		TODO: description needed
GCAMTEMP	float64		TODO: description needed
GHUMID2	float64		TODO: description needed
GHUMID3	float64		TODO: description needed
CRPIX1	float64		TODO: description needed
CRPIX2	float64		TODO: description needed
CRVAL1	float64		TODO: description needed
CRVAL2	float64		TODO: description needed

HDU3

EXTNAME = FOCUS1

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	8	int	width of table in bytes
NAXIS2	9288	int	number of rows in table
ZTILE3	1	int	size of tiles to be compressed
BZERO	32768	int	offset data range to that of unsigned short
BSCALE	1	int	default scaling factor
DEVICE	FOCUS1	str	Device/controller name
UNIT	1	int	Unit number/letter
UNITTYPE	FOCUS	str	Image Sources/Component
EXPID	118526	int	Exposure number
FRAMES	9	int	Number of Frames in Archive
TILEID	4403	int	DESI Tile ID
FIBASSGN	/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	2022-01-14T11:03:58.542861	str	[UTC] Observation data and start time
MJD-OBS	59593.46109425	float	Modified Julian Date of observation
OPENSHUT	2022-01-14T11:03:58.542861	str	Time shutter opened
ST	11:14:12.2376	str	Local Sidereal time at observation start (HH:MM
FOCSTIME	60.0	float	[s] focus GFA exposure time
REQRA	170.239	float	[deg] Requested right ascension (observer input
REQDEC	-7.093	float	[deg] Requested declination (observer input)
DELTARA	None	Unknown	[arcsec] Offset], right ascension, observer inp
DELTADEC	None	Unknown	[arcsec] Offset], declination, observer input
FOCUS	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
TRUSTEMP	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP	11.675	float	[deg] Average primary mirror temperature (nit,e
EPOCH	2000.0	float	Epoch of observation
EQUINOX	2000.0	float	Equinox of selected coordinate reference frame
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
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)
USEETC	T	bool	ETC data available if true
ACQCAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
ADC1PHI	None	Unknown	[deg] ADC 1 angle
USESKY	T	bool	DOS Control: use Sky Monitor
USEFOCUS	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	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
USEGUIDR	T	bool	DOS Control: use guider
USEDONUT	T	bool	DOS Control: use donuts
WCSAXES	2	int
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
CTYPE1	RA—TAN	str
CTYPE2	DEC–TAN	str
CD1_1	-3.4711e-05	float
CD1_2	4.4105e-05	float
CD2_1	4.8013e-05	float
CD2_2	3.1893e-05	float
SHAPE	1032,2248	str
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
ADCPHI2	None	Unknown
ROI	None	Unknown
ROIWIDTH	None	Unknown
GEXPMODE	normal	str	GFA readout mode (loop/normal)
DEVICEID	dev05	str	GFA device id (serial number)
REQTIME	1860.0	float	[s] Requested exposure time
CHECKSUM	4NNh7NNg4NNg4NNg	str	HDU checksum updated 2022-01-14T11:13:59
DATASUM	3152869116	str	data unit checksum updated 2022-01-14T11:13:59

Data: FITS image [int16 (compressed), 2248x1032x9]

HDU4

EXTNAME = FOCUS1T

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	242	int	width of table in bytes
NAXIS2	9	int	number of rows in table
CHECKSUM	jaafmSWfjYafjYUf	str	HDU checksum updated 2022-01-14T11:13:59
DATASUM	626101938	str	data unit checksum updated 2022-01-14T11:13:59

Required Data Table Columns

Name	Type	Units	Description
EXPTIME	float64		TODO: description needed
REQTIME	float64		TODO: description needed
NIGHT	int64		TODO: description needed
DATE-OBS	char[*]		TODO: description needed
TIME-OBS	char[*]		TODO: description needed
MJD-OBS	float64		TODO: description needed
OPENSHUT	char[*]		TODO: description needed
ST	char[*]		TODO: description needed
HEXPOS	char[*]		TODO: description needed
GAMBNTT	float64		TODO: description needed
GFPGAT	float64		TODO: description needed
GFILTERT	float64		TODO: description needed
GCOLDTEC	float64		TODO: description needed
GHOTTEC	float64		TODO: description needed
GCCDTEMP	float64		TODO: description needed
GCAMTEMP	float64		TODO: description needed
GHUMID2	float64		TODO: description needed
GHUMID3	float64		TODO: description needed
CRPIX1	float64		TODO: description needed
CRPIX2	float64		TODO: description needed
CRVAL1	float64		TODO: description needed
CRVAL2	float64		TODO: description needed

HDU5

EXTNAME = FOCUS9

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	8	int	width of table in bytes
NAXIS2	9288	int	number of rows in table
ZTILE3	1	int	size of tiles to be compressed
BZERO	32768	int	offset data range to that of unsigned short
BSCALE	1	int	default scaling factor
DEVICE	FOCUS9	str	Device/controller name
UNIT	9	int	Unit number/letter
UNITTYPE	FOCUS	str	Image Sources/Component
EXPID	118526	int	Exposure number
FRAMES	9	int	Number of Frames in Archive
TILEID	4403	int	DESI Tile ID
FIBASSGN	/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	2022-01-14T11:03:58.542861	str	[UTC] Observation data and start time
MJD-OBS	59593.46109425	float	Modified Julian Date of observation
OPENSHUT	2022-01-14T11:03:58.542861	str	Time shutter opened
ST	11:14:12.2376	str	Local Sidereal time at observation start (HH:MM
FOCSTIME	60.0	float	[s] focus GFA exposure time
REQRA	170.239	float	[deg] Requested right ascension (observer input
REQDEC	-7.093	float	[deg] Requested declination (observer input)
DELTARA	None	Unknown	[arcsec] Offset], right ascension, observer inp
DELTADEC	None	Unknown	[arcsec] Offset], declination, observer input
FOCUS	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
TRUSTEMP	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP	11.675	float	[deg] Average primary mirror temperature (nit,e
EPOCH	2000.0	float	Epoch of observation
EQUINOX	2000.0	float	Equinox of selected coordinate reference frame
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
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)
USEETC	T	bool	ETC data available if true
ACQCAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
ADC1PHI	None	Unknown	[deg] ADC 1 angle
USESKY	T	bool	DOS Control: use Sky Monitor
USEFOCUS	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	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
USEGUIDR	T	bool	DOS Control: use guider
USEDONUT	T	bool	DOS Control: use donuts
WCSAXES	2	int
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
CTYPE1	RA—TAN	str
CTYPE2	DEC–TAN	str
CD1_1	-5.6317e-05	float
CD1_2	-1.6905e-05	float
CD2_1	-1.8398e-05	float
CD2_2	5.1751e-05	float
SHAPE	1032,2248	str
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
ADCPHI2	None	Unknown
ROI	None	Unknown
ROIWIDTH	None	Unknown
GEXPMODE	normal	str	GFA readout mode (loop/normal)
DEVICEID	dev03	str	GFA device id (serial number)
REQTIME	1860.0	float	[s] Requested exposure time
CHECKSUM	gjaCgjZBgjaBgjWB	str	HDU checksum updated 2022-01-14T11:13:59
DATASUM	1001490193	str	data unit checksum updated 2022-01-14T11:13:59

Data: FITS image [int16 (compressed), 2248x1032x9]

HDU6

EXTNAME = FOCUS9T

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	242	int	width of table in bytes
NAXIS2	9	int	number of rows in table
CHECKSUM	79AXA97X79AXA97X	str	HDU checksum updated 2022-01-14T11:14:00
DATASUM	2395983219	str	data unit checksum updated 2022-01-14T11:14:00

Required Data Table Columns

Name	Type	Units	Description
EXPTIME	float64		TODO: description needed
REQTIME	float64		TODO: description needed
NIGHT	int64		TODO: description needed
DATE-OBS	char[*]		TODO: description needed
TIME-OBS	char[*]		TODO: description needed
MJD-OBS	float64		TODO: description needed
OPENSHUT	char[*]		TODO: description needed
ST	char[*]		TODO: description needed
HEXPOS	char[*]		TODO: description needed
GAMBNTT	float64		TODO: description needed
GFPGAT	float64		TODO: description needed
GFILTERT	float64		TODO: description needed
GCOLDTEC	float64		TODO: description needed
GHOTTEC	float64		TODO: description needed
GCCDTEMP	float64		TODO: description needed
GCAMTEMP	float64		TODO: description needed
GHUMID2	float64		TODO: description needed
GHUMID3	float64		TODO: description needed
CRPIX1	float64		TODO: description needed
CRPIX2	float64		TODO: description needed
CRVAL1	float64		TODO: description needed
CRVAL2	float64		TODO: description needed

HDU7

EXTNAME = FOCUS6

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	8	int	width of table in bytes
NAXIS2	9288	int	number of rows in table
ZTILE3	1	int	size of tiles to be compressed
BZERO	32768	int	offset data range to that of unsigned short
BSCALE	1	int	default scaling factor
DEVICE	FOCUS6	str	Device/controller name
UNIT	6	int	Unit number/letter
UNITTYPE	FOCUS	str	Image Sources/Component
EXPID	118526	int	Exposure number
FRAMES	9	int	Number of Frames in Archive
TILEID	4403	int	DESI Tile ID
FIBASSGN	/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	2022-01-14T11:03:58.542861	str	[UTC] Observation data and start time
MJD-OBS	59593.46109425	float	Modified Julian Date of observation
OPENSHUT	2022-01-14T11:03:58.542861	str	Time shutter opened
ST	11:14:12.2376	str	Local Sidereal time at observation start (HH:MM
FOCSTIME	60.0	float	[s] focus GFA exposure time
REQRA	170.239	float	[deg] Requested right ascension (observer input
REQDEC	-7.093	float	[deg] Requested declination (observer input)
DELTARA	None	Unknown	[arcsec] Offset], right ascension, observer inp
DELTADEC	None	Unknown	[arcsec] Offset], declination, observer input
FOCUS	946.6,-231.6,-83.4,-18.3,9.8,139.4	str	Telescope focus settings
TRUSTEMP	12.267	float	[deg] Average Telescope truss temperature (only
PMIRTEMP	11.675	float	[deg] Average primary mirror temperature (nit,e
EPOCH	2000.0	float	Epoch of observation
EQUINOX	2000.0	float	Equinox of selected coordinate reference frame
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
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)
USEETC	T	bool	ETC data available if true
ACQCAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Acquisition cameras used
GUIDECAM	GUIDE0,GUIDE2,GUIDE3,GUIDE5,GUIDE7,GUIDE8	str	Guide cameras used for t
FOCUSCAM	FOCUS1,FOCUS4,FOCUS6,FOCUS9	str	Focus cameras used for this exposure
SKYCAM	SKYCAM0,SKYCAM1	str	Sky cameras used for this exposure
ADC1PHI	None	Unknown	[deg] ADC 1 angle
USESKY	T	bool	DOS Control: use Sky Monitor
USEFOCUS	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	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
USEGUIDR	T	bool	DOS Control: use guider
USEDONUT	T	bool	DOS Control: use donuts
WCSAXES	2	int
RADESYS	FK5	str	Coordinate reference frame of major/minor axes
CTYPE1	RA—TAN	str
CTYPE2	DEC–TAN	str
CD1_1	3.496e-05	float
CD1_2	-4.3929e-05	float
CD2_1	-4.782e-05	float
CD2_2	-3.2123e-05	float
SHAPE	1032,2248	str
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
ADCPHI2	None	Unknown
ROI	None	Unknown
ROIWIDTH	None	Unknown
GEXPMODE	normal	str	GFA readout mode (loop/normal)
DEVICEID	dev13	str	GFA device id (serial number)
REQTIME	1860.0	float	[s] Requested exposure time
CHECKSUM	Uf34ac13Vc13ac13	str	HDU checksum updated 2022-01-14T11:14:00
DATASUM	1884870740	str	data unit checksum updated 2022-01-14T11:14:00

Data: FITS image [int16 (compressed), 2248x1032x9]

HDU8

EXTNAME = FOCUS6T

TODO: description needed

Required Header Keywords

Required Header Keywords Table

KEY	Example Value	Type	Comment
NAXIS1	242	int	width of table in bytes
NAXIS2	9	int	number of rows in table
CHECKSUM	K2DmK0BjK0BjK0Bj	str	HDU checksum updated 2022-01-14T11:14:00
DATASUM	2998174015	str	data unit checksum updated 2022-01-14T11:14:00

Required Data Table Columns

Name	Type	Units	Description
EXPTIME	float64		TODO: description needed
REQTIME	float64		TODO: description needed
NIGHT	int64		TODO: description needed
DATE-OBS	char[*]		TODO: description needed
TIME-OBS	char[*]		TODO: description needed
MJD-OBS	float64		TODO: description needed
OPENSHUT	char[*]		TODO: description needed
ST	char[*]		TODO: description needed
HEXPOS	char[*]		TODO: description needed
GAMBNTT	float64		TODO: description needed
GFPGAT	float64		TODO: description needed
GFILTERT	float64		TODO: description needed
GCOLDTEC	float64		TODO: description needed
GHOTTEC	float64		TODO: description needed
GCCDTEMP	float64		TODO: description needed
GCAMTEMP	float64		TODO: description needed
GHUMID2	float64		TODO: description needed
GHUMID3	float64		TODO: description needed
CRPIX1	float64		TODO: description needed
CRPIX2	float64		TODO: description needed
CRVAL1	float64		TODO: description needed
CRVAL2	float64		TODO: description needed