Category B

Version 3.0.1

FITS Keyword

Levels

SPC Variable

Description

BITPIX

0/1

BITPIX

This sets the flag in SPC for how many bits to treat the data. Everything is eventually converted into unsigned integer. For ORex, the level 0 data is 16. The camera is a 14-bit imager, but the SPOC will pad the leading bits to 0 to make it a simple unsigned 16-bit integer. IF a LUT (look-up-table) is used, the SPOC will convert the 8-bit LUT into the standard 16-bit integers. For level 1, it is set to -32, which is 32-bit signed.

DATE_OBS

0/1

UTC0

The UTC time of the observation. This is converted within SPC via SPICE into ET, setting both ET0 and ET.

EXPTIME

0/1

EXP

The duration of the exposure. It is used to calculate the midpoint of the exposure. This is _ used for OREx.

SCLK_STR

0/1

CLK0 and CKLUSE

This is the spacecraft clock. If this value is set in the FITS headers, it is the primary time used to calculate the midpoint of the exposure.

NAXIS1

0/1

NPX

Number of pixels wide (the x value)

NAXIS2

0/1

NLN

Number of pixels tall (the y value)

CAMERAID

0/1

CAM

Which camera is being used. Values are 0-Map, 1-Sam, 2-Poly

MTR_POS

0/1

FLT

Defines the position of the PolyCam motor, which is used to calculate its focal position. For MapCam and SamCam, it provides the position of the filter wheel in degrees.

LUT

0

LUT

If LUT is defined, this tells what LUT was used on the spacecraft. No processing is done via SPC because the SPOC has already done it. This variable isn't used

MCFWHTMP

0/1

NTX (1,1)

MapCam temperature. The final algorithm has not been decided yet. However, the weighting of each temperature can be adjusted in the file DN2TEMP.TXT. This assumes a linear mixing of the four camera temperatures. Level 0 is in DN. Level 1 is in degrees C

MCFWMTMP

0/1

NTX (1,2)

see above

MCLENTMP

0/1

NTX (1,3)

see above

MCROETMP

0/1

NTX (1,4)

see above

SCFWHTMP

0/1

NTX (2,1)

SamCam temperature. The final algorithm has not been decided yet. However, the weighting of each temperature can be adjusted in the file DN2TEMP.TXT. This assumes a linear mixing of the four camera temperatures. Level 0 is in DN. Level 1 is in degrees C

SCFWMTMP

0/1

NTX (2,2)

see above

SCLENTMP

0/1

NTX (2,3)

see above

SCROETMP

0/1

NTX (2,4)

see above

PCFWHTMP

0/1

NTX (3,1)

PolyCam temperature. The final algorithm has not been decided yet. However, the weighting of each temperature can be adjusted in the file DN2TEMP.TXT. This assumes a linear mixing of the four camera temperatures. Level 0 is in DN. Level 1 is in degrees C

PCFWMTMP

0/1

NTX (3,2)

see above

PCLENTMP

0/1

NTX (3,3)

see above

PCROETMP

0/1

NTX (3,4)

see above

NCCHTEMP

0

NTX (4,0) and NTX (4,1)

NavCam temperature.

TCCHTEMP

0

NTX (5,0) and NTX (5,1)

TAGCam temperature

SC_QA

0/1

QT(0)

Quadterians. OREx will write the spacecraft pointing information, as of when the image was taken, into the FITS header. process_fits will output them in the file quaternions.txt in the format PICNM, QT(I), I=0,3

SC_QX

0/1

QT(1)

see above

SC_QY

0/1

QT(2)

see above

SC_QZ

0/1

QT(3)

see above

BZERO

0

DDN and SIGNED

FORTRAN reads all integers as signed. Because the data is unsigned, then the DN values less than zero are converted into high-bit values.

INSTRUME

0/1

INAME and NC

Level 0 has OCAMS, so NC is set via CAMERAID-1. This is the name of the instrument in human-readable form. It sets the variable NC as follows: