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UIT Search Output Columns

This document defines the catalog entries describing the UIT Data Archive as delivered to STScI by the GSFC Astrophysics Data Facility (ADF). Most of the documentation below was obtained from either the UIT project (in particular, Bob Hill), or Pat Lawton from ADF.

Archive Background:

The Ultraviolet Imaging Telescope (UIT) was one of three instruments which comprised the ASTRO observatory. ASTRO-1 was flown on the space shuttle Columbia in December, 1990, and ASTRO-2 was flown in March, 1995 on the space shuttle Endeavor. UIT obtained ultraviolet images with a 40' field of view and a 3" resolution. The data was recorded on 70 mm photographic film which was later digitized using a Perkin-Elmer microdensitometer.

Row
The row number of each record in the results of your search.

Mark
Clicking on this box will mark the entry for retrieval.

Target Name
The name of the astronomical object.

Alternative Object Name
An alternative name of the astronomical object.

Ref
Specifies the number of currently known papers referencing the listed UIT data ID. A blank indicates there are no known papers referencing the listed data ID (although the database may not be complete). Clicking on a "Ref" entry (other than a "-") will display a list of known papers with links to the online ADS papers.

Data ID
The UIT Data ID uniquely defines each UIT observation. The name is of the form CuvMnnn where
  • C = "N" for the near-UV camera (which failed during the ASTRO-2 mission), or "F" for the far-UV camera,
  • M = "0" for ASTRO-1 data, "1" for ASTRO-2 data before a Dedicated Experiment Processor (DEP) memory change reset the frame counter, or "2" for ASTRO-2 data after the DEP memory change.
  • nnn = a three-digit number designating the order in which the UIT observations were obtained for a particular camera.
As an example, data ID FUV2349 designates the 349th exposure with the Far-UV camera during the ASTRO-2 mission.

Note that for each observation, several data sets may be produced representing different stages of processing. The final linearized undistorted data set may be stored using a file name such as fuv2349g.fit.

Clicking on an "data ID" entry will display the preview image page which also contains links to display the FITS header and download a tar file of gzipped FITS files.

Filter
The UIT instrument included two six-position filter wheels. The "A" filters were sensitive in the near-UV while the "B" filters were sensitive in the Far-UV. The near-UV camera was only operational for the ASTRO-1 flight. The effective wavelengths and FWHM's are listed below:
  • A1 - 2488 Å, FWHM = 1147 Å
  • A2 - 1892 Å, FWHM = 412 Å
  • A3 - 1964 Å, FWHM = 173 Å
  • A4 - 2205 Å, FWHM = 244 Å
  • A5 - 2558 Å, FWHM = 456 Å
  • A6 - Grating
  • B1 - 1521 Å, FWHM = 354 Å
  • B2 - 1359 Å, FWHM = 160 Å
  • B3 - 1445 Å, FWHM = 256 Å
  • B4 - 1585 Å, FWHM = 129 Å
  • B5 - 1615 Å, FWHM = 255 Å
  • B6 - 1497 Å, FWHM = 404 Å

Obs. Start Time
This is the GMT time, of the start of the observation. Although stored in the database to the nearest second, the default display format shows the date truncated to the minute.

RA (J2000)
Object's Right Ascension in J2000 coordinates specified in hours, minutes, and seconds. These values were used when processing the data, and are not necessarily the same as the coordinates used to point the spacecraft during the observation. Note for moving targets, these are the mean of the ephemeris coordinates during the observation(?).

Dec (J2000)
Object's declination in J2000 coordinates specified in degrees, minutes, and seconds. These values were used when processing the data, and are not necessarily the same as the coordinates used to point the spacecraft during the observation. Note for moving targets, these are the mean of the ephemeris coordinates during the observation(?).

RA (J1950)
Object's Right Ascension in J1950 coordinates specified in hours, minutes, and seconds. These values were used when processing the data, and are not necessarily the same as the coordinates used to point the spacecraft during the observation. Note for moving targets, these are the mean of the ephemeris coordinates during the observation(?).

Dec (J1950)
Object's declination in J1950 coordinates specified in degrees, minutes, and seconds. These values were used when processing the data, and are not necessarily the same as the coordinates used to point the spacecraft during the observation. Note for moving targets, these are the mean of the ephemeris coordinates during the observation(?).

Exposure Time
The corrected exposure times in seconds used in the batch data processing (BDR) are stored in the database and in the FITS headers using the keyword EXPTIME (uncorrected times are stored in the FITS header using the keyword FEXPTIME.)

Object Category
These are broad categories assigned by the UIT project.

Processing Code
The following entries describe the processing performed:
  • D - Nothing on frame (e.g., because of DEP bug). Was scanned, but not processed. Only D file exists.
  • E - No astrometry done, so D, E, and EC images exist. APH file may exist.
  • F - Astrometry done, so D, F, FC, G, and GC images exist. APH file may exist. PPH file may exist.

Mission Number
The ASTRO mission number, either 1 for mission in Dec. 1990 or 2 for that in March 1995

Point ID
ID code assigned by the ASTRO missions that identifies each shuttle pointing includes the jotfid which identifies each target

Point ID
ID assigned to each astronomical target name by ASTRO missions.

Prime Instrument
The "primary" instrument for the observation. The other instruments may have also been exposing in parallel.

Camera
The camera used: "NUV" for the near-UV camera (which failed during the ASTRO-2 mission), or "FUV" for the far-UV camera.

Frame Number
The frame number of the film frame exposed. For ASTRO-1 data a three-digit number designating the order in which the UIT observations were obtained for a particular camera.

For ASTRO-2 Data, the three-digit number is preceded by a "1" for ASTRO-2 data before a Dedicated Experiment Processor (DEP) memory change reset the frame counter, or "2" for ASTRO-2 data after the DEP memory change.

Door Status
The status of the door. Mostly not entered. All others set to O.

Mission Elapsed Time
The time elapsed since the beginning of the mission.

Day Night Flag

Day Time
Exposure time in seconds during spacecraft "day". Only available for ASTRO-1.

Shadow Time
Exposure time in seconds during spacecraft "night". Only available for ASTRO-1.

Roll Angle
Roll Angle.

Ecliptic Latitude
Ecliptic Latitude for the observation.

Ecliptic Longitude
Ecliptic Longitude for the observation

Galactic Latitude
Galactic Latitude for the observation.

Galactic Longitude
Galactic Longitude for the observation.