fiberflatexp-CAMERA-EXPID.fits

Summary:

This file contains the fiberflat to use for a specific exposure such that newflux = rawflux/fiberflat.

Naming Convention:

fiberflatexp-{CAMERA}-{EXPID}.fits, where {camera} is the camera name (e.g. b0, r1, z9) and {EXPID} is the zero padded 8-digit exposure ID.

Regex:

fiberflatexp-[brz][0-9]-[0-9]{8}\.fits

File Type:

FITS, 15 MB

Contents

Number

EXTNAME

Type

Contents

HDU0

FIBERFLAT

IMAGE

fiberflat[nspec, nwave]

HDU1

IVAR

IMAGE

inverse variance of fiberflat

HDU2

MASK

IMAGE

bitmask of fiberflat (0=good)

HDU3

MEANSPEC

IMAGE

average spectrum[nwave]

HDU4

WAVELENGTH

IMAGE

wavelength grid[nwave] in Angstroms

HDU5

FIBERMAP

BINTABLE

Target photometry, metadata, and what fibers they are assigned to

FITS Header Units

HDU0

EXTNAME = FIBERFLAT

Fiber flat field correction to homogeneize the response among fibers of the same camera, for each wavelength. 2D array of dimension [nspec, nwave]. nspec is the number of fibers per camera. nwave in the length of the wavelength array. The fiber flat field of all fibers share the same wavelength grid (given in HDU WAVELENGTH). This file is valid for a specific exposure as it comprises a correction based on the humidity in the spectrograph enclosure.

Required Header Keywords

Required Header Keywords Table

KEY

Example Value

Type

Comment

NAXIS1

2326

int

NAXIS2

500

int

EXPID

68978

int

Exposure number

EXPFRAME

0

int

Frame number

FLAVOR

science

str

Observation type

SEQUENCE

Spectrographs

str

OCS Sequence name

PURPOSE

Commissioning

str

Purpose of observing night

PROGRAM

CALIB DESI-CALIB-00 LEDs only

str

Program name

PROPID

2019B-5000

str

Proposal ID

OBSERVER

DESIObserver

str

Names of observers

LEAD

RunManager

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

20201220

int

Observing night

TIMESYS

UTC

str

Time system used for date-obs

DATE-OBS

2020-12-20T22:21:08.680251

str

[UTC] Observation data and start time

TIME-OBS

22:21:08.680251

str

[UTC] Observation start time

MJD-OBS

59203.93135047

float

Modified Julian Date of observation

ST

20:54:33.840

str

Local Sidereal time at observation start (HH:MM

EXPTIME

120.042

float

[s] Actual exposure time

DELTARA

0.0

float

[arcsec] Offset], right ascension, observer inp

DELTADEC

0.0

float

[arcsec] Offset], declination, observer input

VCCD

ON

str

True (ON) if CCD voltage is on

VCCDON

2020-12-09T21:23:19.320868

str

Time when CCD voltage was turned on

VCCDSEC

954038.9

float

[s] CCD on time in seconds

EQUINOX [1]

2000.0

float

Epoch of observation

SPECGRPH

0

int

Spectrograph logical name (SP)

SPECID

4

int

Spectrograph serial number (SM)

FEEBOX

lbnl078

str

CCD Controller serial number

VESSEL

14

int

Cryostat serial number

FEEVER

v20160312

str

CCD Controller version

FEEPOWER

ON

str

FEE power status

FEEDMASK

2134851391

int

FEE dac mask

FEECMASK

1048575

int

FEE clk mask

CCDTEMP

-142.1871

float

[deg C] CCD controller CCD temperature

RADESYS

FK5

str

Coordinate reference frame of major/minor axes

FILENAME

/exposures/desi/specs/20201220/00068978/sp0-00068978.fits.fz

str

Name

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

CASETEMP

57.3533

float

[deg C] CCD controller case temperature

OFFSET1

0.4000000059604645,-8.858

str

[V] set value, measured value

CLOCK18

9.0,0.9999

str

[V] high rail, low rail

BIASSECC

[2065:2128, 2130:4193]

str

Bias section for quadrant C

CLOCK12

9.9992,2.9993

str

[V] high rail, low rail

CLOCK9

9.9992,2.9993

str

[V] high rail, low rail

AMPSECC

[1:2057, 4128:2065]

str

AMP section for quadrant C

DAC9

-25.0003,-24.5305

str

[V] set value, measured value

CLOCK15

9.9992,2.9993

str

[V] high rail, low rail

CLOCK8

9.9992,2.9993

str

[V] high rail, low rail

PRESECA

[1:7, 2:2065]

str

Prescan section for quadrant A

CCDPREP

purge,clear

str

CCD prep actions

DAC16

39.9961,39.5934

str

[V] set value, measured value

OFFSET3

0.4000000059604645,-8.9095

str

[V] set value, measured value

DETSECB

[2058:4114, 1:2064]

str

Detector section for quadrant B

BIASSECA

[2065:2128, 2:2065]

str

Bias section for quadrant A

PGAGAIN

3

int

Controller gain

DAC13

0.0,0.0148

str

[V] set value, measured value

CLOCK6

9.9999,0.0

str

[V] high rail, low rail

DAC10

-25.0003,-24.3376

str

[V] set value, measured value

DAC7

5.9998,6.028

str

[V] set value, measured value

CLOCK1

9.9999,0.0

str

[V] high rail, low rail

CLOCK5

9.9999,0.0

str

[V] high rail, low rail

CLOCK11

9.9992,2.9993

str

[V] high rail, low rail

ORSECC

[8:2064, 2098:2129]

str

Row overscan section for quadrant C

DAC15

0.0,-0.0148

str

[V] set value, measured value

DETSECA

[1:2057, 1:2064]

str

Detector section for quadrant A

CDSPARMS

400, 400, 8, 2000

str

CDS parameters

PRRSECC

[8:2064, 4194:4194]

str

Row prescan section for quadrant C

BLDTIME

0.3509

float

[s] Time to build image

DAC11

-25.0003,-24.3673

str

[V] set value, measured value

OFFSET2

0.4000000059604645,-8.9301

str

[V] set value, measured value

BIASSECB

[2129:2192, 2:2065]

str

Bias section for quadrant B

DELAYS

20, 20, 25, 40, 7, 3000, 7, 7, 7, 7

str

[10] Delay settings

CLOCK0

9.9999,0.0

str

[V] high rail, low rail

OFFSET5

2.0,6.028

str

[V] set value, measured value

CLOCK10

9.9992,2.9993

str

[V] high rail, low rail

DATASECD

[2193:4249, 2130:4193]

str

Data section for quadrant D

DAC1

-9.0002,-8.858

str

[V] set value, measured value

DIGITIME

47.5334

float

[s] Time to digitize image

CAMERA

r0

str

Camera name

CCDNAME

CCDSM4R

str

CCD name

DAC6

5.9998,6.0017

str

[V] set value, measured value

CCDSIZE

4194,4256

str

CCD size in pixels (rows, columns)

CLOCK4

9.9999,0.0

str

[V] high rail, low rail

CCDSECD

[2058:4114, 2065:4128]

str

CCD section for quadrant D

CCDSECB

[2058:4114, 1:2064]

str

CCD section for quadrant B

DAC8

-25.0003,-24.9164

str

[V] set value, measured value

CLOCK14

9.9992,2.9993

str

[V] high rail, low rail

CLOCK2

9.9999,0.0

str

[V] high rail, low rail

CCDCFG

default_lbnl_20190717.cfg

str

CCD configuration file

PRESECD

[4250:4256, 2130:4193]

str

Prescan section for quadrant D

DETSECD

[2058:4114, 2065:4128]

str

Detector section for quadrant D

DATASECA

[8:2064, 2:2065]

str

Data section for quadrant A

CLOCK13

9.9992,2.9993

str

[V] high rail, low rail

ORSECB

[2193:4249, 2066:2097]

str

Row overscan section for quadrant B

DATASECC

[8:2064, 2130:4193]

str

Data section for quadrant C

AMPSECA

[1:2057, 1:2064]

str

AMP section for quadrant A

ORSECD

[2193:4249, 2098:2129]

str

Row bias section for quadrant D

PRRSECA

[8:2064, 1:1]

str

Row prescan section for quadrant A

CCDSECA

[1:2057, 1:2064]

str

CCD section for quadrant A

DAC3

-9.0002,-8.9095

str

[V] set value, measured value

SETTINGS

detectors_sm_20191211.json

str

Name of DESI CCD settings file

AMPSECB

[4114:2058, 1:2064]

str

AMP section for quadrant B

CRYOTEMP [1]

163.044

float

[deg K] Cryostat CCD temperature

DAC17

20.0008,11.9804

str

[V] set value, measured value

CLOCK7

-2.0001,3.9999

str

[V] high rail, low rail

TRIMSECB

[2193:4249, 2:2065]

str

Trim section for quadrant B

CCDSECC

[1:2057, 2065:4128]

str

CCD section for quadrant C

PRRSECB

[2193:4249, 1:1]

str

Row prescan section for quadrant B

DATASECB

[2193:4249, 2:2065]

str

Data section for quadrant B

PRESECC

[1:7, 2130:4193]

str

Prescan section for quadrant C

DAC5

5.9998,6.028

str

[V] set value, measured value

DAC14

0.0,-0.0148

str

[V] set value, measured value

PRESECB

[4250:4256, 2:2065]

str

Prescan section for quadrant B

PRRSECD

[2193:4249, 4194:4194]

str

Row prescan section for quadrant D

AMPSECD

[4114:2058, 4128:2065]

str

AMP section for quadrant D

DAC12

0.0,0.0

str

[V] set value, measured value

TRIMSECC

[8:2064, 2130:4193]

str

Trim section for quadrant C

CLOCK17

9.0,0.9999

str

[V] high rail, low rail

TRIMSECD

[2193:4249, 2130:4193]

str

Trim section for quadrant D

DETSECC

[1:2057, 2065:4128]

str

Detector section for quadrant C

CRYOPRES [1]

9.322e-08

str

[mb] Cryostat pressure (IP)

OFFSET0

0.4000000059604645,-8.9198

str

[V] set value, measured value

CPUTEMP

56.9941

float

[deg C] CCD controller CPU temperature

CLOCK16

9.9999,3.0

str

[V] high rail, low rail

OFFSET4

2.0,6.0174

str

[V] set value, measured value

CCDTMING

default_lbnl_timing_20180905.txt

str

CCD timing file

TRIMSECA

[8:2064, 2:2065]

str

Trim section for quadrant A

DAC4

5.9998,6.0174

str

[V] set value, measured value

OFFSET7

2.0,6.0332

str

[V] set value, measured value

CLOCK3

-2.0001,3.9999

str

[V] high rail, low rail

ORSECA

[8:2064, 2066:2097]

str

Row overscan section for quadrant A

OFFSET6

2.0,6.0017

str

[V] set value, measured value

DETECTOR

M1-49

str

Detector (ccd) identification

DAC0

-9.0002,-8.9198

str

[V] set value, measured value

DAC2

-9.0002,-8.9301

str

[V] set value, measured value

BIASSECD

[2129:2192, 2130:4193]

str

Bias section for quadrant D

REQTIME

120.0

float

[s] Requested exposure time

OBSID

kp4m20201220t222108

str

Unique observation identifier

PROCTYPE

RAW

str

Data processing level

PRODTYPE

image

str

Data product type

CHECKSUM

oo3Aon02on08on08

str

HDU checksum updated 2022-01-29T01:26:43

DATASUM

424075550

str

data unit checksum updated 2022-01-29T01:26:43

GAINA

1.655

float

e/ADU (gain applied to image)

SATULEVA

65535.0

float

saturation or non lin. level, in ADU, inc. bias

OSTEPA [1]

0.7301409887440968

float

ADUs (max-min of median overscan per row)

OMETHA [1]

AVERAGE

str

use average overscan

OVERSCNA

1978.069214285938

float

ADUs (gain not applied)

OBSRDNA

2.798159188935688

float

electrons (gain is applied)

SATUELEA

105186.7204503568

float

saturation or non lin. level, in electrons

GAINB

1.488

float

e/ADU (gain applied to image)

SATULEVB

65535.0

float

saturation or non lin. level, in ADU, inc. bias

OSTEPB [1]

0.7607557420124067

float

ADUs (max-min of median overscan per row)

OMETHB [1]

AVERAGE

str

use average overscan

OVERSCNB

1987.133968648987

float

ADUs (gain not applied)

OBSRDNB

2.557416670656615

float

electrons (gain is applied)

SATUELEB

94559.2246546503

float

saturation or non lin. level, in electrons

GAINC

1.583

float

e/ADU (gain applied to image)

SATULEVC

65535.0

float

saturation or non lin. level, in ADU, inc. bias

OSTEPC [1]

0.6293911971442867

float

ADUs (max-min of median overscan per row)

OMETHC [1]

AVERAGE

str

use average overscan

OVERSCNC

1966.939262512987

float

ADUs (gain not applied)

OBSRDNC

2.703494293725218

float

electrons (gain is applied)

SATUELEC

100628.2401474419

float

saturation or non lin. level, in electrons

GAIND

1.507

float

e/ADU (gain applied to image)

SATULEVD

65535.0

float

saturation or non lin. level, in ADU, inc. bias

OSTEPD [1]

0.6596786995360162

float

ADUs (max-min of median overscan per row)

OMETHD [1]

AVERAGE

str

use average overscan

OVERSCND

1994.41783538263

float

ADUs (gain not applied)

OBSRDND

2.441905057216482

float

electrons (gain is applied)

SATUELED

95755.65732207838

float

saturation or non lin. level, in electrons

FIBERMIN

0

int

LONGSTRN [1]

OGIP 1.0

str

The OGIP Long String Convention may be used.

MODULE

CI

str

Image Sources/Component

FRAMES

None

Unknown

Number of Frames in Archive

COSMSPLT

F

bool

Cosmics split exposure if true

MAXSPLIT

0

int

Number of allowed exposure splits

SPLITIDS [1]

68978

str

List of expids for split exposures

OBSTYPE

FLAT

str

Spectrograph observation type

MANIFEST

F

bool

DOS exposure manifest

OBJECT

str

Object name

SEQID

3 requests

str

Exposure sequence identifier

SEQNUM

1

int

Number of exposure in sequence

SEQTOT

3

int

Total number of exposures in sequence

OPENSHUT

None

Unknown

Time shutter opened

CAMSHUT

open

str

Shutter status during observation

WHITESPT [1]

T

bool

Telescope is at whitespot

ZENITH [1]

F

bool

Telescope is at zenith

SEANNEX [1]

F

bool

Telescope is at SE annex

BEYONDP [1]

F

bool

Telescope is beyond pole

FIDUCIAL [1]

off

str

Fiducials status during observation

AIRMASS [1]

1.521306

float

Airmass

FOCUS [1]

1163.9,-689.8,370.4,13.8,24.2,-0.0

str

Telescope focus settings

TRUSTEMP [1]

13.2

float

[deg] Average Telescope truss temperature (only

PMIRTEMP [1]

7.3

float

[deg] Average primary mirror temperature (nit,e

PMREADY [1]

F

bool

Primary mirror ready

PMCOVER [1]

open

str

Primary mirror cover

PMCOOL [1]

on

str

Primary mirror cooling

DOMSHUTU [1]

not open

str

Upper dome shutter

DOMSHUTL [1]

not open

str

Lower dome shutter

DOMLIGHH [1]

off

str

High dome lights

DOMLIGHL [1]

off

str

Low dome lights

DOMEAZ [1]

253.289

float

[deg] Dome azimuth angle

DOMINPOS [1]

F

bool

Dome is in position

GUIDOFFR [1]

0.0

float

[arcsec] Cummulative guider offset (RA)

GUIDOFFD [1]

-0.0

float

[arcsec] Cummulative guider offset (dec)

MOONDEC [1]

-9.840963

float

[deg] Moon declination at start of exposure

MOONRA [1]

350.487504

float

[deg] Moon RA at start of exposure

MOUNTAZ [1]

73.494042

float

[deg] Mount azimuth angle

MOUNTDEC [1]

31.962725

float

[deg] Mount declination

MOUNTEL [1]

41.035784

float

[deg] Mount elevation angle

MOUNTHA [1]

-58.479517

float

[deg] Mount hour angle

INCTRL [1]

F

bool

DESI in control

INPOS [1]

T

bool

Mount in position

MNTOFFD [1]

-0.0

float

[arcsec] Mount offset (dec)

MNTOFFR [1]

-0.0

float

[arcsec] Mount offset (RA)

PARALLAC [1]

-73.492831

float

[deg] Parallactic angle

SKYDEC [1]

31.962725

float

[deg] Telescope declination (pointing on sky)

SKYRA [1]

12.118172

float

[deg] Telescope right ascension (pointing on sk

TARGTDEC [1]

31.9633

float

[deg] Target declination (to TCS)

TARGTRA [1]

6.305085

float

[deg] Target right ascension (to TCS)

TARGTAZ [1]

75.317651

float

[deg] Target azimuth

TARGTEL [1]

45.786076

float

[deg] Target elevation

TRGTOFFD [1]

0.0

float

[arcsec] Telescope target offset (dec)

TRGTOFFR [1]

0.0

float

[arcsec] Telescope target offset (RA)

ZD [1]

48.964216

float

[deg] Telescope zenith distance

TCSST [1]

20:54:33.277

str

Local Sidereal time reported by TCS (HH:MM:SS)

TCSMJD [1]

59203.93178

float

MJD reported by TCS

ADCCORR

F

bool

Correct pointing for ADC setting if True

ADC1PHI [1]

114.980003

float

[deg] ADC 1 angle

ADC2PHI [1]

162.869907

float

[deg] ADC 2 angle

ADC1HOME [1]

F

bool

ADC 1 at home position if True

ADC2HOME [1]

F

bool

ADC 2 at home position if True

ADC1NREV [1]

0.0

float

ADC 1 number of revs

ADC2NREV [1]

-1.0

float

ADC 2 number of revs

ADC1STAT [1]

STOPPED

str

ADC 1 status

ADC2STAT [1]

STOPPED

str

ADC 2 status

HEXPOS [1]

1163.9,-689.8,370.4,13.8,24.2,-0.0

str

Hexapod position

HEXTRIM [1]

0.0,0.0,0.0,0.0,0.0,0.0

str

Hexapod trim values

ROTOFFST [1]

0.0

float

[arcsec] Rotator offset

ROTENBLD [1]

T

bool

Rotator enabled

ROTRATE [1]

0.0

float

[arcsec/min] Rotator rate

RESETROT

F

bool

DOS Control: reset hex rotator

GUIDMODE

catalog

str

Guider mode

USEAOS [1]

F

bool

DOS Control: AOS data available if true

SPCGRPHS

SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9

str

Participating spectrograph

ILLSPECS [1]

SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9

str

Participating illuminate s

CCDSPECS [1]

SP0,SP1,SP2,SP3,SP4,SP5,SP6,SP7,SP8,SP9

str

Participating ccd spectrog

TDEWPNT [1]

-18.063

float

Telescope air dew point

TAIRFLOW [1]

1.121

float

Telescope air flow

TAIRITMP [1]

10.5

float

[deg] Telescope air in temperature

TAIROTMP [1]

5.7

float

[deg] Telescope air out temperature

TAIRTEMP [1]

11.843

float

[deg] Telescope air temperature

TCASITMP [1]

0.0

float

[deg] Telescope Cass Cage in temperature

TCASOTMP [1]

9.6

float

[deg] Telescope Cass Cage out temperature

TCSITEMP [1]

7.4

float

[deg] Telescope center section in temperature

TCSOTEMP [1]

10.2

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]

7.3

float

[deg] Telescope dec bore temperature

TFLOWIN [1]

8.0

float

Telescope flow rate in

TFLOWOUT [1]

8.3

float

Telescope flow rate out

TGLYCOLI [1]

-1.9

float

[deg] Telescope glycol in temperature

TGLYCOLO [1]

0.0

float

[deg] Telescope glycol out temperature

THINGES [1]

12.9

float

[deg] Telescope hinge S temperature

THINGEW [1]

11.9

float

[deg] Telescope hinge W temperature

TPMAVERT [1]

7.295

float

[deg] Telescope mirror averagetemperature

TPMDESIT [1]

7.0

float

[deg] Telescope mirror desired temperature

TPMEIBT [1]

7.4

float

[deg] Telescope mirror EIB temperature

TPMEITT [1]

7.3

float

[deg] Telescope mirror EIT temperature

TPMEOBT [1]

7.4

float

[deg] Telescope mirror EOB temperature

TPMEOTT [1]

7.1

float

[deg] Telescope mirror EOT temperature

TPMNIBT [1]

7.5

float

[deg] Telescope mirror NIB temperature

TPMNITT [1]

7.2

float

[deg] Telescope mirror NIT temperature

TPMNOBT [1]

7.7

float

[deg] Telescope mirror NOB temperature

TPMNOTT [1]

7.5

float

[deg] Telescope mirror NOT temperature

TPMRTDT [1]

7.09

float

[deg] Telescope mirror RTD temperature

TPMSIBT [1]

7.4

float

[deg] Telescope mirror SIB temperature

TPMSITT [1]

7.0

float

[deg] Telescope mirror SIT temperature

TPMSOBT [1]

7.4

float

[deg] Telescope mirror SOB temperature

TPMSOTT [1]

7.1

float

[deg] Telescope mirror SOT temperature

TPMSTAT [1]

soft air

str

Telescope mirror status

TPMWIBT [1]

7.3

float

[deg] Telescope mirror WIB temperature

TPMWITT [1]

7.1

float

[deg] Telescope mirror WIT temperature

TPMWOBT [1]

7.6

float

[deg] Telescope mirror WOB temperature

TPMWOTT [1]

8.1

float

[deg] Telescope mirror WOT temperature

TPCITEMP [1]

7.7

float

[deg] Telescope primary cell in temperature

TPCOTEMP [1]

7.7

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]

7.0

float

Telescope servo setpoint

TTRSTEMP [1]

13.0

float

[deg] Telescope top ring S temperature

TTRWTEMP [1]

13.4

float

[deg] Telescope top ring W temperature

TTRUETBT [1]

-4.8

float

[deg] Telescope truss ETB temperature

TTRUETTT [1]

11.6

float

[deg] Telescope truss ETT temperature

TTRUNTBT [1]

11.0

float

[deg] Telescope truss NTB temperature

TTRUNTTT [1]

11.8

float

[deg] Telescope truss NTT temperature

TTRUSTBT [1]

11.2

float

[deg] Telescope truss STB temperature

TTRUSTST [1]

10.8

float

[deg] Telescope truss STS temperature

TTRUSTTT [1]

12.4

float

[deg] Telescope truss STT temperature

TTRUTSBT [1]

13.5

float

[deg] Telescope truss TSB temperature

TTRUTSMT [1]

13.6

float

[deg] Telescope truss TSM temperature

TTRUTSTT [1]

12.5

float

[deg] Telescope truss TST temperature

TTRUWTBT [1]

11.0

float

[deg] Telescope truss WTB temperature

TTRUWTTT [1]

11.7

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]

5682.0

float

[s] UPS Seconds left

UPSSTAT [1]

System Normal - On Line(7)

str

UPS Status

INAMPS [1]

65.7

float

[A] UPS total input current

OUTWATTS [1]

4700.0,6900.0,4100.0

str

[W] UPS Phase A, B, C output watts

COMPDEW [1]

-12.1

float

[deg C] Computer room dewpoint

COMPHUM [1]

7.7

float

[%] Computer room humidity

COMPAMB [1]

19.3

float

[deg C] Computer room ambient temperature

COMPTEMP [1]

24.9

float

[deg C] Computer room hygrometer temperature

DEWPOINT [1]

5.7

float

[deg C] (outside) dewpoint

HUMIDITY [1]

7.0

float

[%] (outside) humidity

PRESSURE [1]

795.0

float

[torr] (outside) air pressure

OUTTEMP [1]

0.0

float

[deg C] outside temperature

WINDDIR [1]

87.0

float

[deg] wind direction

WINDSPD [1]

19.1

float

[m/s] wind speed

GUST [1]

14.4

float

[m/s] Wind gusts speed

AMNIENTN [1]

13.4

float

[deg C] ambient temperature north

CFLOOR [1]

8.1

float

[deg C] temperature on C floor

NWALLIN [1]

13.6

float

[deg C] temperature at north wall inside

NWALLOUT [1]

8.8

float

[deg C] temperature at north wall outside

WWALLIN [1]

12.8

float

[deg C] temperature at west wall inside

WWALLOUT [1]

9.4

float

[deg C] temperature at west wall outside

AMBIENTS [1]

14.6

float

[deg C] ambient temperature south

FLOOR [1]

12.4

float

[deg C] temperature at floor (LCR)

EWALLCMP [1]

10.2

float

[deg C] temperature at east wall, computer room

EWALLCOU [1]

9.5

float

[deg C] temperature at east wall, Coude room

ROOF [1]

9.9

float

[deg C] temperature on roof

ROOFAMB [1]

9.9

float

[deg C] ambient temperature on roof

DOMEBLOW [1]

12.1

float

[deg C] temperature at dome back, lower

DOMEBUP [1]

12.5

float

[deg C] temperature at dome back, upper

DOMELLOW [1]

14.4

float

[deg C] temperature at dome left, lower

DOMELUP [1]

19.4

float

[deg C] temperature at dome left, upper

DOMERLOW [1]

12.3

float

[deg C] temperature at dome right, lower

DOMERUP [1]

12.8

float

[deg C] temperature at dome right, upper

PLATFORM [1]

15.3

float

[deg C] temperature at platform

SHACKC [1]

15.2

float

[deg C] temperature at shack ceiling

SHACKW [1]

13.2

float

[deg C] temperature at shack wall

STAIRSL [1]

12.6

float

[deg C] temperature at stairs, lower

STAIRSM [1]

13.3

float

[deg C] temperature at stairs, mid

STAIRSU [1]

13.6

float

[deg C] temperature at stairs, upper

TELBASE [1]

8.5

float

[deg C] temperature at telescope base

UTILWALL [1]

11.6

float

[deg C] temperature at utility room wall

UTILROOM [1]

12.4

float

[deg C] temperature in utilitiy room

EXCLUDED

str

Components excluded from this exposure

NSPEC

500

int

Number of spectra

WAVEMIN

5760.0

float

First wavelength [Angstroms]

WAVEMAX

7620.0

float

Last wavelength [Angstroms]

WAVESTEP

0.8

float

Wavelength step size [Angstroms]

SPECTER

0.10.0

str

https://github.com/desihub/specter

IN_PSF

SPECPROD/exposures/20201220/00068978/psf-r0-00068978.fits

str

Input sp

IN_IMG

SPECPROD/preproc/20201220/00068978/preproc-r0-00068978.fits

str

Input image

ORIG_PSF [1]

SPECPROD/calibnight/20201220/psfnight-r0-20201220.fits

str

CHI2PDF

1.088304575350556

float

BUNIT

str

adimensional quantity to divide to flatfield a frame

TCSPIDEC [1]

1.0,0.0,0.0,0.0

str

TCS PI settings (P, I (gain, error window, satu

TCSPIRA [1]

1.0,0.0,0.0,0.0

str

TCS PI settings (P, I (gain, error window, satu

CALTHUM [1]

15.32

float

dome flat humidity from telemetry

TCSGRA [1]

0.3

float

TCS simple gain (RA)

EXPFHUM [1]

17.64312009333441

float

exposure humidity from flat fit

TCSMFRA [1]

1

int

TCS moving filter length (RA)

SEQSTART [1]

2021-03-09T00:34:23.379721

str

Start time of sequence processing

TCSKRA [1]

0.3 0.003 0.00003

str

TCS Kalman (RA)

MOONSEP [1]

171.522

float

[deg] Moon Separation

NTSSURVY [1]

na

str

NTS survey name

TCSKDEC [1]

0.3 0.003 0.00003

str

TCS Kalman (dec)

TCSMFDEC [1]

1

int

TCS moving filter length (dec)

TCSGDEC [1]

0.3

float

TCS simple gain (dec)

SUNDEC [1]

-4.488284

float

[deg] Sun declination at start of exposure

SUNRA [1]

349.569123

float

[deg] Sun RA at start of exposure

CALFHUM [1]

14.32350765258646

float

dome flat humidity from flat fit

EXPTHUM [1]

16.63

float

exposure humidity from telemetry

EPOCH [1]

2000.0

float

Epoch of observation

SKYLEVEL [1]

6.268

float

counts?] ETC sky level

TRANSPAR [1]

None

Unknown

ETC/PM transparency

SEEING [1]

None

Unknown

[arcsec] ETC/PM seeing

Data: FITS image [float32, 2751x500]

HDU1

EXTNAME = IVAR

Inverse variance (1/sigma^2) of the fiber flat field in HDU0.

Required Header Keywords

Required Header Keywords Table

KEY

Example Value

Type

Comment

NAXIS1

2751

int

NAXIS2

500

int

BUNIT

str

inverse variance, adimensional

CHECKSUM

kdmLldmJkdmJkdmJ

str

HDU checksum updated 2022-02-01T22:58:01

DATASUM

4118276244

str

data unit checksum updated 2022-02-01T22:58:01

Data: FITS image [float32, 2751x500]

HDU2

EXTNAME = MASK

Mask of the fiberflat; 0=good. See the bitmask documentation page for the definition of the bits. Prior to desispec/0.24.0 and software release 18.9, the MASK HDU was compressed.

Required Header Keywords

Required Header Keywords Table

KEY

Example Value

Type

Comment

NAXIS1

2751

int

NAXIS2

500

int

BSCALE

1

int

BZERO

2147483648

int

CHECKSUM

RHdLRGcIRGcIRGcI

str

HDU checksum updated 2022-02-01T22:58:02

DATASUM

687834

str

data unit checksum updated 2022-02-01T22:58:02

Data: FITS image [int32, 2751x500]

HDU3

EXTNAME = MEANSPEC

Average flat lamp spectrum of fibers in this camera frame. The fiber flat field is in first approximation the ratio of the measured spectra to this mean spectrum (in practice we use a deconvolved mean spectrum and reconvolve it with the resolution of each fiber). The units are electrons per Angstrom.

Required Header Keywords

Required Header Keywords Table

KEY

Example Value

Type

Comment

NAXIS1

2751

int

BUNIT

electron/Angstrom

str

CHECKSUM

4TMJ6RKJ4RKJ4RKJ

str

HDU checksum updated 2022-02-01T22:58:02

DATASUM

2617283155

str

data unit checksum updated 2022-02-01T22:58:02

Data: FITS image [float32, 2751]

HDU4

EXTNAME = WAVELENGTH

Wavelength grid in Angstrom used by this fiber flat field. Note that contrary to the science frame, this wavelength array is in the observer frame. In consequence, one has to first convert its wavelength to the solar barycenter frame before using this data to flat field a science exposure. See the frame WAVELENGTH documentation for more details.

Required Header Keywords

Required Header Keywords Table

KEY

Example Value

Type

Comment

NAXIS1

2751

int

BUNIT

Angstrom

str

CHECKSUM

5qI85oG75oG75oG7

str

HDU checksum updated 2022-02-01T22:58:02

DATASUM

2458411755

str

data unit checksum updated 2022-02-01T22:58:02

Data: FITS image [float32, 2751]

HDU5

EXTNAME = FIBERMAP

Fibermap with information about the fiber status.

Required Header Keywords

Required Header Keywords Table

KEY

Example Value

Type

Comment

NAXIS1

369

int

length of dimension 1

NAXIS2

500

int

length of dimension 2

ENCODING

ascii

str

CHECKSUM

aBFAbA93aAE9aA99

str

HDU checksum updated 2022-02-01T22:58:02

DATASUM

3386980400

str

data unit checksum updated 2022-02-01T22:58:02

Required Data Table Columns

Name

Type

Units

Description

TARGETID

int64

Unique DESI target ID

PETAL_LOC

int16

Petal location [0-9]

DEVICE_LOC

int32

Device location on focal plane [0-523]

LOCATION

int64

Location on the focal plane PETAL_LOC*1000 + DEVICE_LOC

FIBER

int32

Fiber ID on the CCDs [0-4999]

FIBERSTATUS

int32

Fiber status mask. 0=good

TARGET_RA

float64

deg

Barycentric right ascension in ICRS

TARGET_DEC

float64

deg

Barycentric declination in ICRS

PMRA

float32

mas yr^-1

proper motion in the +RA direction (already including cos(dec))

PMDEC

float32

mas yr^-1

Proper motion in the +Dec direction

REF_EPOCH

float32

yr

Reference epoch for Gaia/Tycho astrometry. Typically 2015.5 for Gaia

LAMBDA_REF

float32

Angstrom

Requested wavelength at which targets should be centered on fibers

FA_TARGET

int64

Targeting bit internally used by fiberassign (linked with FA_TYPE)

FA_TYPE

binary

Fiberassign internal target type (science, standard, sky, safe, suppsky)

OBJTYPE

char[3]

Object type: TGT, SKY, NON, BAD

FIBERASSIGN_X

float32

mm

Fiberassign expected CS5 X location on focal plane

FIBERASSIGN_Y

float32

mm

Fiberassign expected CS5 Y location on focal plane

PRIORITY

int32

Target current priority

SUBPRIORITY

float64

Random subpriority [0-1) to break assignment ties

OBSCONDITIONS

int32

Bitmask of allowed observing conditions

RELEASE

int16

Imaging surveys release ID

BRICKNAME [1]

char[8]

Brick name from tractor input

BRICKID

int64

Brick ID from tractor input

BRICK_OBJID

int64

Imaging Surveys OBJID on that brick

MORPHTYPE

char[4]

Imaging Surveys morphological type from Tractor

EBV

float32

mag

Galactic extinction E(B-V) reddening from SFD98

FLUX_G

float32

nanomaggy

Flux in the Legacy Survey g-band (AB)

FLUX_R

float32

nanomaggy

Flux in the Legacy Survey r-band (AB)

FLUX_Z

float32

nanomaggy

Flux in the Legacy Survey z-band (AB)

FLUX_W1

float32

nanomaggy

WISE flux in W1 (AB)

FLUX_W2

float32

nanomaggy

WISE flux in W2 (AB)

FLUX_IVAR_G

float32

nanomaggy^-2

Inverse variance of FLUX_G (AB)

FLUX_IVAR_R

float32

nanomaggy^-2

Inverse variance of FLUX_R (AB)

FLUX_IVAR_Z

float32

nanomaggy^-2

Inverse variance of FLUX_Z (AB)

FLUX_IVAR_W1

float32

nanomaggy^-2

Inverse variance of FLUX_W1 (AB)

FLUX_IVAR_W2

float32

nanomaggy^-2

Inverse variance of FLUX_W2 (AB)

FIBERFLUX_G

float32

nanomaggy

Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing

FIBERFLUX_R

float32

nanomaggy

Predicted r-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing

FIBERFLUX_Z

float32

nanomaggy

Predicted z-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing

FIBERTOTFLUX_G

float32

nanomaggy

Predicted g-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing

FIBERTOTFLUX_R

float32

nanomaggy

Predicted r-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing

FIBERTOTFLUX_Z

float32

nanomaggy

Predicted z-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing

MASKBITS [1]

int16

Bitwise mask from the imaging indicating potential issue or blending

SERSIC [1]

float32

Power-law index for the Sersic profile model (MORPHTYPE=’SER’)

SHAPE_R [1]

float32

arcsec

Half-light radius of galaxy model (>0)

SHAPE_E1 [1]

float32

Ellipticity component 1 of galaxy model for galaxy type MORPHTYPE

SHAPE_E2 [1]

float32

Ellipticity component 2 of galaxy model for galaxy type MORPHTYPE

REF_ID

int64

Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho-2; sourceid for Gaia DR2

REF_CAT [1]

char[2]

Reference catalog source for star: ‘T2’ for Tycho-2, ‘G2’ for Gaia DR2, ‘L2’ for the SGA, empty otherwise

GAIA_PHOT_G_MEAN_MAG [1]

float32

mag

Gaia G band magnitude

GAIA_PHOT_BP_MEAN_MAG [1]

float32

mag

Gaia BP band magnitude

GAIA_PHOT_RP_MEAN_MAG [1]

float32

mag

Gaia RP band magnitude

PARALLAX [1]

float32

mas

Reference catalog parallax

PHOTSYS

char[1]

‘N’ for the MzLS/BASS photometric system, ‘S’ for DECaLS

PRIORITY_INIT

int64

Target initial priority from target selection bitmasks and OBSCONDITIONS

NUMOBS_INIT

int64

Initial number of observations for target calculated across target selection bitmasks and OBSCONDITIONS

DESI_TARGET

int64

DESI (dark time program) target selection bitmask

BGS_TARGET

int64

BGS (Bright Galaxy Survey) target selection bitmask

MWS_TARGET

int64

Milky Way Survey targeting bits

SCND_TARGET [1]

int64

Target selection bitmask for secondary programs

PLATE_RA [1]

float64

deg

Barycentric Right Ascension in ICRS to be used by PlateMaker

PLATE_DEC [1]

float64

deg

Barycentric Declination in ICRS to be used by PlateMaker

NUM_ITER

int64

Number of positioner iterations

FIBER_X [1]

float64

mm

CS5 X location requested by PlateMaker

FIBER_Y [1]

float64

mm

CS5 Y location requested by PlateMaker

DELTA_X [1]

float64

mm

CS5 X requested minus actual position

DELTA_Y [1]

float64

mm

CS5 Y requested minus actual position

FIBER_RA

float64

deg

RA of actual fiber position

FIBER_DEC

float64

deg

DEC of actual fiber position

EXPTIME [1]

float64

s

Length of time shutter was open

NUMOBS_MORE [1]

int32

Number of additional observations needed

NUMTARGET [1]

int16

Total number of targets that this positioner covered

SPECTROID [1]

int32

Hardware ID of spectrograph (not used)

HPXPIXEL [1]

int64

HEALPixel containing this location at NSIDE=64 in the NESTED scheme

PMDEC_IVAR [1]

float32

yr^2 mas^-2

Inverse variance of PMDEC

MW_TRANSMISSION_Z [1]

float32

Milky Way dust transmission in LS z-band

MW_TRANSMISSION_G [1]

float32

Milky Way dust transmission in LS g-band

MW_TRANSMISSION_R [1]

float32

Milky Way dust transmission in LS r-band

PMRA_IVAR [1]

float32

yr^2 mas^-2

Inverse variance of PMRA