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NOTE: Most of the High Level Science Products are unavailable while unscheduled maintenance is being performed. They will be incrementally restored over the course of this week. We apologize for any inconvenience.

Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE)
Level 0 FIELD Camera Image Data FITS files
March 22, 1994

1.0 Description of the Instrument

The Wisconsin Ultraviolet Photo-Polarimeter Experiment (WUPPE) was one of three ultraviolet telescopes on the ASTRO-1 payload which flew aboard the space shuttle Columbia during a nine day mission in December 1990 (December 2 through December 11). WUPPE is a 0.5m f/10 Cassegrain telescope and spectropolarimeter. It obtained simultaneous spectra and polarization measurements, with a spectral resolution of about 10A, from 1400 to 3200A. A set of halfwave plates at 6 different angles provided spectropolarimetric modulation with 10A resolution on point sources through apertures from 6 to 40 arcsec. A "Lyot" analyzer is used to provide 50-100A spectropolarimetric resolution on faint point targets and diffuse nebulae. The typical diffuse object aperture was 3x50 arcsec.

2.0 WUPPE1 Level 0 Zero Order Detector (ZOD) (ASTRO 1-01C):

Field identification, offsetting, focussing, and pointing trim were accomplished by relaying the zero-order image of the Wisconsin Ultraviolet Photo Polarimeter Experiment (WUPPE) spectrometer grating to a blue-sensitive zero-order detector (ZOD) camera. The ZOD was an intensified RCA 320x512 two-dimensional CCD array. The intensifier was an ITT 18 mm proximity-focussed channel intensifier with P-20 phosphor, quartz faceplate, and S-20 photocathode for blue-sensitivity. The array was uncooled and typically read out every second. There are three types of ZOD data; field, zoom and downfield images. No calibrations have been applied to the ZOD images and thus it is Level 0 data. The individual ZOD images are archived in FITS format. The field mode was used for identification and acquisition of the targets. Its size was 3.3 x 4.4 arcmin, 320 x 256 pixels using a 1-bit display. The zoom mode was used for fine pointing and focus. The size of the zoom image was 24 x 32 arcsec, 30 x 40 pixels using a 6-bit grey scale display. The downfield data is similar to the field data except it used the 6-bit grey scale display and was used to produce a more detailed picture of the field around the object of interest.

The FIELD camera camera data were provided to the NSSDC in FITS files ordered by Object-ID and by Mission Elapsed Time (MET) day number. Each 12 hour time slice of FIELD camera data by MET day number contains hundreds to thousands of field camera images. The FIELD data by Object-ID includes 9 raw field images taken *preceeding* observations of science targets (remember that the field mode is used to acquire the target.)

In Field mode, the 240 readout lines were summed by pairs on the chip and the data were compared in hardware to a threshold register to obtain a display of 320 x 120 black or white pixels. In this data set, to create the 320 x 240 pixel image, the rows were duplicated (i.e. row 1 = row 2; row 3 = row 4,.. row 239 = row 240).

There are 9 targets for which there are associated field camera data (ordered by Object ID):

               Object ID   PointingID P     MET     
               ---------    -------   -    ------- 
               HR1099       350311    H    1/15:25      
               G70D8247     260911    W    1/18:51 
               EZ-CMA       230220    W    3/04:27 
               ALF-HYI      240110    W    4/00:53
               M82          720510    U    4/03:09
               NGC4151      811613    H    5/21:51
               NGC1068      820234    U    6/17:12
               U-GEM        320811    H    7/22:31
               M81          621611    U    8/01:27

3.0 WUPPE FIELD Camera Data FITS File naming convention

There are 10 WUPPE raw FIELD camera images in one level 0 raw FIELD camera data FITS file.

3.1 WUPPE FIELD FITS file names by Object ID

The files are named as follows:

WUPPE1_OBJECTID_PPPPPP_FD_nnnnn.fits

where

OBJECTID = The Mission Target List name. The names are common to the HUT, UIT and WUPPE instruments. The number of characters in OBJECT can vary from 3 to 8 characters. May be a mix of numbers and/or alphabetic information.

PPPPPP = The POINTING_ID is a 6 digit number representing the object identification number which was assigned during the ASTRO1 mission. Each shuttle pointing had a unique POINTING_ID number.

FD = Denotes Level 0 ZOD FIELD camera data.

nnnnn = 5 digit FIELD Starting Image Number

For example, FITS file "WUPPE1_HR1099_350311_FD_00001.fits" contains raw images 1 through 10 for the HR1099 3503-11 observation. "WUPPE1_HR1099_350311_FD_00011.fits" contains raw images 11 through 20 from the HR1099 observation.

3.2 WUPPE FIELD FITS file names by MET Day Number

The files are named as follows:

FITS file name = WUPPE1_DAYyz_FD_nnnnn.FITS

where,

DAYyz = The mission elapsed time (MET) day number times 10 (eg. 00, 05, 10,... 80). Files are grouped into 12-hour periods for each DAYyz (MET time of y.z).

FD = Denotes Level 0 ZOD FIELD camera data.

nnnnn = Starting FIELD image number.

For example, FITS file "WUPPE1_DAY05_FD_0001.FITS" contains raw images 1 through 10 from day 0.5 and "WUPPE1_DAY55_FD_00081.fits" contains images 81 -90 from day 5.5 and were taken during a WUPPE target acquisition.

4.0 Description of WUPPE FIELD Camera FITS files

The FITS files were written on a digital DECstation 5000/240 using DEC FORTRAN for Ultrix RISC Systems, running Ultrix 4.2 at the University of Wisconsin. The FITSIO package, version 3.2, written by William Pence at the Goddard Spaceflight Center, was used to generate the FITS files.

Each FIELD FITS file (by MET Day number) is 777600 bytes in length (1519 VMS blocks).

Each FIELD FITS file (by Object ID) is 780480 bytes in length (1525 VMS blocks).

The set of basic header information includes the primary array keywords and keywords describing the instrument and data arrays and 8 keywords describing the telescope observational and engineering data for each of the 10 raw field camera images in the FITS file.

Sample header FITS FIELD file headers are given below.

Each field image consists of 320x240 8-bit words. The FITS file then contains 320x240x10 8-bit words. If there were not enough field images to complete a 10 image FITS file, zero-filled data were written to the FITS file (a FILLER image). In addition, if the data in the original 12 hour time slice file were so corrupted as to be unreadable, a FILLER image was written in its place.

5.0 Software

The program "fldfitsread.f" was written to verify the contents of the Level 0 FIELD Camera Image FITS files. It also uses the GSFC FITSIO software package. (It only prints out the first 60 data points per row for the first image in the file.) This program, along with other WUPPE1 fortran programs, is available from NDADS. "saoimage" was also used to verify the Field Camera Image FITS file.

6.0 Sample FITS FIELD File Headers

6.1 FIELD FITS File Header by Object ID

INPUT FITS file = WUPPE1_NGC4151_811613_FD_00081.fits

*****************************************************

SIMPLE  =                    T / file does conform to FITS standard             
BITPIX  =                    8 / number of bits per data pixel                  
NAXIS   =                    3 / number of data axes                            
NAXIS1  =                  320 / length of data axis   1                        
NAXIS2  =                  240 / length of data axis   2                        
NAXIS3  =                   10 / length of data axis   3                        
COMMENT   Each field image has 320x240 data points                              
COMMENT   There are 10 field images in each FITS file                           
CTYPE1  = 'Pixel   '           / Pixel Number                                   
CRPIX1  =                  1.0 / Reference pixel location                       
CRVAL1  =                  1.0 / Reference pixel coordinate value               
CDELT1  =                  1.0 / Delta pixel number                             
CTYPE2  = 'Row     '           / Row Number                                     
CRPIX2  =                  1.0 / Reference row location                         
CRVAL2  =                  1.0 / Reference row coordinate value                 
CDELT2  =                  1.0 / Delta row number                               
CTYPE3  = 'Image No.'          / Field Image Number                             
CRPIX3  =                  1.0 / Reference image location                       
CRVAL3  =                 81.0 / Starting image number,=FIELD01                 
CDELT3  =                  1.0 / Delta image number                             
ORIGIN  = 'UW-Space Astronomy Lab' / Creator of FITS file                       
DATE    = 'Wed Jan 12 20:09:12 1994' / Date FITS file was created               
OBSERVAT= 'ASTRO-1 '           / Observatory                                    
TELESCOP= 'WUPPE   '           / Telescope                                      
INSTRUME= 'SPECTROPOLARIMETER' / Instrument Used                                
OBJECT  = 'NGC4151 '           / Object Observed                                
ID      = '8116-13 '           / Target ID                                      
PRIME   = 'HUT     '           / Prime Instrument                               
EQUINOX =              1950.00 / Equinox for coordinates                        
RA      =             182.0044 / Right ascension in degrees                     
DEC     =              39.6839 / Declination in degrees                         
GMTSTART= '90/342/ 5:14:43'    / GMT start time of observation                  
GMTSTOP = '90/342/ 5:23:18'    / GMT stop time of observation                   
METSTART= '5/22:25:42'         / Mission Elapsed Time start time                
METSTOP = '5/22:34:17'         / Mission Elapsed Time stop time                 
FIELD01 =                   81 / Field Image Number                             
CURSEQ01=                  404 / Current Sequence Number                        
STATUS01= '3: LOC  '           / Instrument Status Mode                         
GMTTIM01= '342/ 4:42: 0'       / GMT time of data readout                       
METTIM01= '5/21:52:59'         / MET time of data readout                       
BOS01   =                 25.0 / Bright Object Sensor reading                   
QUAL01  =                    0 / SLDPF Quality Flag (max)                       
IMAGE01 = 'FIELD IMAGE'        / Field Image                                    
FIELD02 =                   82 / Field Image Number                             
CURSEQ02=                  404 / Current Sequence Number                        
STATUS02= '3: LOC  '           / Instrument Status Mode                         
GMTTIM02= '342/ 4:42: 1'       / GMT time of data readout                       
METTIM02= '5/21:53: 0'         / MET time of data readout                       
BOS02   =                 25.0 / Bright Object Sensor reading                   
QUAL02  =                    0 / SLDPF Quality Flag (max)                       
IMAGE02 = 'FIELD IMAGE'        / Field Image                                    
FIELD03 =                   83 / Field Image Number                             
CURSEQ03=                  404 / Current Sequence Number                        
STATUS03= '3: LOC  '           / Instrument Status Mode                         
GMTTIM03= '342/ 4:42: 2'       / GMT time of data readout                       
METTIM03= '5/21:53: 1'         / MET time of data readout                       
BOS03   =                 25.0 / Bright Object Sensor reading                   
QUAL03  =                    0 / SLDPF Quality Flag (max)                       
IMAGE03 = 'FIELD IMAGE'        / Field Image                                    
FIELD04 =                   84 / Field Image Number                             
CURSEQ04=                  404 / Current Sequence Number                        
STATUS04= '3: LOC  '           / Instrument Status Mode                         
GMTTIM04= '342/ 4:42: 3'       / GMT time of data readout                       
METTIM04= '5/21:53: 2'         / MET time of data readout                       
BOS04   =                 25.0 / Bright Object Sensor reading                   
QUAL04  =                    0 / SLDPF Quality Flag (max)                       
IMAGE04 = 'FIELD IMAGE'        / Field Image                                    
FIELD05 =                   85 / Field Image Number                             
CURSEQ05=                  404 / Current Sequence Number                        
STATUS05= '3: LOC  '           / Instrument Status Mode                         
GMTTIM05= '342/ 4:42: 4'       / GMT time of data readout                       
METTIM05= '5/21:53: 3'         / MET time of data readout                       
BOS05   =                 25.0 / Bright Object Sensor reading                   
QUAL05  =                    0 / SLDPF Quality Flag (max)                       
IMAGE05 = 'FIELD IMAGE'        / Field Image                                    
FIELD06 =                   86 / Field Image Number                             
CURSEQ06=                  404 / Current Sequence Number                        
STATUS06= '3: LOC  '           / Instrument Status Mode                         
GMTTIM06= '342/ 4:42: 5'       / GMT time of data readout                       
METTIM06= '5/21:53: 4'         / MET time of data readout                       
BOS06   =                 25.0 / Bright Object Sensor reading                   
QUAL06  =                    0 / SLDPF Quality Flag (max)                       
IMAGE06 = 'FIELD IMAGE'        / Field Image                                    
FIELD07 =                   87 / Field Image Number                             
CURSEQ07=                  404 / Current Sequence Number                        
STATUS07= '3: LOC  '           / Instrument Status Mode                         
GMTTIM07= '342/ 4:42: 6'       / GMT time of data readout                       
METTIM07= '5/21:53: 5'         / MET time of data readout                       
BOS07   =                 25.0 / Bright Object Sensor reading                   
QUAL07  =                    0 / SLDPF Quality Flag (max)                       
IMAGE07 = 'FIELD IMAGE'        / Field Image                                    
FIELD08 =                   88 / Field Image Number                             
CURSEQ08=                  404 / Current Sequence Number                        
STATUS08= '3: LOC  '           / Instrument Status Mode                         
GMTTIM08= '342/ 4:42: 7'       / GMT time of data readout                       
METTIM08= '5/21:53: 6'         / MET time of data readout                       
BOS08   =                 25.0 / Bright Object Sensor reading                   
QUAL08  =                    0 / SLDPF Quality Flag (max)                       
IMAGE08 = 'FIELD IMAGE'        / Field Image                                    
FIELD09 =                   89 / Field Image Number                             
CURSEQ09=                  404 / Current Sequence Number                        
STATUS09= '3: LOC  '           / Instrument Status Mode                         
GMTTIM09= '342/ 4:42: 8'       / GMT time of data readout                       
METTIM09= '5/21:53: 7'         / MET time of data readout                       
BOS09   =                 25.0 / Bright Object Sensor reading                   
QUAL09  =                    0 / SLDPF Quality Flag (max)                       
IMAGE09 = 'FIELD IMAGE'        / Field Image                                    
FIELD10 =                   90 / Field Image Number                             
CURSEQ10=                  404 / Current Sequence Number                        
STATUS10= '3: LOC  '           / Instrument Status Mode                         
GMTTIM10= '342/ 4:42: 9'       / GMT time of data readout                       
METTIM10= '5/21:53: 8'         / MET time of data readout                       
BOS10   =                 25.0 / Bright Object Sensor reading                   
QUAL10  =                    0 / SLDPF Quality Flag (max)                       
IMAGE10 = 'FIELD IMAGE'        / Field Image                                    

6.2 FIELD FITS File Header by MET Day Number

WUPPE1_DAY55_FD_00081.fits

SIMPLE  =                    T / file does conform to FITS standard             
BITPIX  =                    8 / number of bits per data pixel                  
NAXIS   =                    3 / number of data axes                            
NAXIS1  =                  320 / length of data axis   1                        
NAXIS2  =                  240 / length of data axis   2                        
NAXIS3  =                   10 / length of data axis   3                        
COMMENT   Each field image has 320x240 data points                              
COMMENT   There are 10 field images in each FITS file                           
CTYPE1  = 'Pixel   '           / Pixel Number                                   
CRPIX1  =                  1.0 / Reference pixel location                       
CRVAL1  =                  1.0 / Reference pixel coordinate value              
CDELT1  =                  1.0 / Delta pixel number                             
CTYPE2  = 'Row     '           / Row Number                                     
CRPIX2  =                  1.0 / Reference row location                        
CRVAL2  =                  1.0 / Reference row coordinate value                 
CDELT2  =                  1.0 / Delta row number                               
CTYPE3  = 'Image No.'          / Field Image Number                             
CRPIX3  =                  1.0 / Reference field image location number          
CRVAL3  =                 81.0 / Starting field image number = FIELD01          
CDELT3  =                  1.0 / Delta image number                             
ORIGIN  = 'UW-Space Astronomy Lab' / Creator of FITS file                       
DATE    = 'Fri Jul 23 20:33:26 1993' / Date FITS file was created               
OBSERVAT= 'ASTRO-1 '           / Observatory                                    
TELESCOP= 'WUPPE   '           / Telescope                                      
INSTRUME= 'SPECTROPOLARIMETER' / Instrument Used                                
FIELD01 =                   81 / Field Image Number                             
CURSEQ01=                  404 / Current Sequence Number                        
STATUS01= '3: LOC  '           / Instrument Status Mode                         
GMTTIM01= '342/ 4:42: 0'       / GMT time of data readout                       
METTIM01= '5/21:52:59'         / MET time of data readout                       
BOS01   =                 25.0 / Bright Object Sensor reading                   
QUAL01  =                    0 / SLDPF Quality Flag (max)                       
IMAGE01 = 'FIELD IMAGE'        / Field Image                                    
FIELD02 =                   82 / Field Image Number                             
CURSEQ02=                  404 / Current Sequence Number                        
STATUS02= '3: LOC  '           / Instrument Status Mode                         
GMTTIM02= '342/ 4:42: 1'       / GMT time of data readout                       
METTIM02= '5/21:53: 0'         / MET time of data readout                       
BOS02   =                 25.0 / Bright Object Sensor reading                   
QUAL02  =                    0 / SLDPF Quality Flag (max)                       
IMAGE02 = 'FIELD IMAGE'        / Field Image                                    
FIELD03 =                   83 / Field Image Number                             
CURSEQ03=                  404 / Current Sequence Number                        
STATUS03= '3: LOC  '           / Instrument Status Mode                         
GMTTIM03= '342/ 4:42: 2'       / GMT time of data readout                       
METTIM03= '5/21:53: 1'         / MET time of data readout                       
BOS03   =                 25.0 / Bright Object Sensor reading                   
QUAL03  =                    0 / SLDPF Quality Flag (max)                       
IMAGE03 = 'FIELD IMAGE'        / Field Image                                    
FIELD04 =                   84 / Field Image Number                             
CURSEQ04=                  404 / Current Sequence Number                        
STATUS04= '3: LOC  '           / Instrument Status Mode                         
GMTTIM04= '342/ 4:42: 3'       / GMT time of data readout                       
METTIM04= '5/21:53: 2'         / MET time of data readout                       
BOS04   =                 25.0 / Bright Object Sensor reading                   
QUAL04  =                    0 / SLDPF Quality Flag (max)                       
IMAGE04 = 'FIELD IMAGE'        / Field Image                                    
FIELD05 =                   85 / Field Image Number                             
CURSEQ05=                  404 / Current Sequence Number                        
STATUS05= '3: LOC  '           / Instrument Status Mode                         
GMTTIM05= '342/ 4:42: 4'       / GMT time of data readout                       
METTIM05= '5/21:53: 3'         / MET time of data readout                       
BOS05   =                 25.0 / Bright Object Sensor reading                   
QUAL05  =                    0 / SLDPF Quality Flag (max)                       
IMAGE05 = 'FIELD IMAGE'        / Field Image                                    
FIELD06 =                   86 / Field Image Number                             
CURSEQ06=                  404 / Current Sequence Number                        
STATUS06= '3: LOC  '           / Instrument Status Mode                         
GMTTIM06= '342/ 4:42: 5'       / GMT time of data readout                       
METTIM06= '5/21:53: 4'         / MET time of data readout                       
BOS06   =                 25.0 / Bright Object Sensor reading                   
QUAL06  =                    0 / SLDPF Quality Flag (max)                       
IMAGE06 = 'FIELD IMAGE'        / Field Image                                    
FIELD07 =                   87 / Field Image Number                             
CURSEQ07=                  404 / Current Sequence Number                        
STATUS07= '3: LOC  '           / Instrument Status Mode                         
GMTTIM07= '342/ 4:42: 6'       / GMT time of data readout                       
METTIM07= '5/21:53: 5'         / MET time of data readout                       
BOS07   =                 25.0 / Bright Object Sensor reading                   
QUAL07  =                    0 / SLDPF Quality Flag (max)                       
IMAGE07 = 'FIELD IMAGE'        / Field Image                                    
FIELD08 =                   88 / Field Image Number                             
CURSEQ08=                  404 / Current Sequence Number                        
STATUS08= '3: LOC  '           / Instrument Status Mode                         
GMTTIM08= '342/ 4:42: 7'       / GMT time of data readout                       
METTIM08= '5/21:53: 6'         / MET time of data readout                       
BOS08   =                 25.0 / Bright Object Sensor reading                   
QUAL08  =                    0 / SLDPF Quality Flag (max)                       
IMAGE08 = 'FIELD IMAGE'        / Field Image                                    
FIELD09 =                   89 / Field Image Number                             
CURSEQ09=                  404 / Current Sequence Number                        
STATUS09= '3: LOC  '           / Instrument Status Mode                         
GMTTIM09= '342/ 4:42: 8'       / GMT time of data readout                       
METTIM09= '5/21:53: 7'         / MET time of data readout                       
BOS09   =                 25.0 / Bright Object Sensor reading                   
QUAL09  =                    0 / SLDPF Quality Flag (max)                       
IMAGE09 = 'FIELD IMAGE'        / Field Image                                    
FIELD10 =                   90 / Field Image Number                             
CURSEQ10=                  404 / Current Sequence Number                        
STATUS10= '3: LOC  '           / Instrument Status Mode                         
GMTTIM10= '342/ 4:42: 9'       / GMT time of data readout                       
METTIM10= '5/21:53: 8'         / MET time of data readout                       
BOS10   =                 25.0 / Bright Object Sensor reading                   
QUAL10  =                    0 / SLDPF Quality Flag (max)                       
IMAGE10 = 'FIELD IMAGE'        / Field Image                                    
END

7.0 Further Information

For further assistance, please send mail to archive@stsci.edu

or contact

Ms. Marilyn Meade
UW Space Astronomy Laboratory
Chamberlin Hall
1150 University Avenue
Madison, WI 53706
Phone (608) 263-4678
meade@sal.wisc.edu
The information on this page came from the WUPPE project via the Astrophysics Data Center at Goddard Space Flight Center.