EXOSAT RAW LE Catalog FITS File

This file serves as a summary of all Low Energy (LE) instrument observations stored within a FOT (Final Observation Tape) file. This FITS file contains a single binary table extension. The content is based on the screen output of the LISTD command from the Interactive Analysis - LE package.

Column Description:

• START : Start time in sec (SHF)
• STOP : Stop time in sec (SHF)
• MJDSTART : Start time in MJD (days)
• MJDSTOP : Stop time in MJD (days)
• RA_OBJ : Object Right Ascension (deg) measured in degrees in the B1950.0 system of coordinates (0°, 360°). Taken from the Auxiliary Data File (ADF): Observation Description Record 2.
• DEC_OBJ : Object Declination (deg) measured in degrees in the same system as above (-90°, +90°) from ADF.
• RA_PNT : Pointing Right Ascension (deg) desired pointing direction in degrees as above also from ADF.
• DEC_PNT : Pointing Declination (deg) desired pointing direction in degrees as above also from ADF.
• SUBMODE : Submode from LISTD. Obtained from the Observation Directory Record. These are the function selections set for particular On Board Computer (OBC) programs. Typical values are (comb1, comb2, hsr1, inactive). The setting determines which type of data records was generated by the OBC program.
• FILTER : Filters values (clsd, PPL, 4Lx, OPEN, Fe Cal, Al/P, 3Lx, Bor, UV) correspond to the Filter Wheel Position Numbers 1 through 9. The filters, in order, are: closed, polypropilene, 4000Å Lexan (thick), open, Fe⁵⁵ calibration source, Aluminum-parylene, 3000Å Lexan (thin), Boron, and Magnesium Fluoride. These are from the LE Telecommand Readouts in the Observation Directory.
• FILENAME : Associated product file prefix (suffixes .hk, .fits) the filenaming convention is ``exYYMMDD_HHMM_HHMM_submode_filter''.
• GRATING : Transmission Grating in place (in/out). From the LE Telecommand Readouts in the Observation Directory.
• DETECTOR : Detector (cma1, cma2). The Channel Multiplier Array Detector with the LE1 telescope (cma1) or with the LE2 telescope (cma2)
• HIGH_TENSION : High tension parameter or AGC setting. When using the CMA detector this is the HV1 & HV2 settings. When the PSD detector is used this is the AGC setting (1.0, 0.66, 0.5, 0.33). From Telecommand Readouts in the Observation Directory.
• POINTING_CODE : Pointing code from LISTD. ``s'' - slewing, pointing of 1 is most stable.
• BACKGND_FILT : Background rejection filter types OFF, DIAMOND, SQUARE. These filters mask part of the detector field of view.
• FIELD_VIEW : For the DIAMOND filter the column element contains, x & y coordinate of origin of diamond and size of the diamond from the origin to the vertex, (range -512,511). For the SQUARE filter the field contains, lower limit for x, upper limit for x, lower limit for y, upper limit for y, (range -512,511). For no filter the field contains ``ALL''.
• SOURCE_NAME : Source name from ADF