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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.
General Results Options
Most mission search results pages have the following general features/options. (Note that the sorting, paging and VOPlot options all require JAVASCRIPT to be supported and turned on, and the interactive plotting option uses HTML5 which is not supported in Internet Explorer before version 9.)
- Clicking on the column headings at the TOP of the
results table will sort the returned results based on the selected
field. Clicking the column heading a second time will sort the
results in descending order. As of August, 2014 sorting is now
possible with RA and Dec coordinates in sexigesimal notation,
and the previous bugs
whereby exponents are ignored in numbers using exponential notation
(e.g., 6.3E-3 is sorted as if it were 6.3), and signs were
ignored in floating point numbers have both been corrected.
Note however
that the sort functions (like many interactive features)
are written in javascript which is not always supported in older
browsers.
Alternatively, selecting the sort options in the initial query
does not depend on javascript,
and will sort the entire search result, not just the displayed
rows.
- Clicking one of the column headings
at the END of the results table (or clicking the
"columns help" link at the top of the page) will display
help information about the search results page and the displayed
columns (i.e., this page).
- By default, results are shown with 500 entries per page, with links
to additional pages if more than 500 entries were returned. The number of
rows per page can be modified using the "Records per Page" form element
on the search form. The total number
of entries returned is set by the "Maximum Records" value from the search page.
- One numerical column can be plotted versus another using VOPlot
although see the Help page regarding issues
with the latest version of Java.
- For some missions, thumbnail images of the returned entries
can be displayed by clicking the link listed just below the VOPlot link.
- The mark column, as described below, can be used to plot spectra and download files. Plots are now interactive with added features.
Column Information
- Mark
- Clicking on this box will mark the entry for retrieval.
To retrieve
The data will be downloaded to your computer in a single .tar, .tar.gz, tar.Z or .zip file. Choose the file type you desire. Then click on the "Download selected datasets" button.- The name of the astronomical object.
- An alternative name of the astronomical object.
- 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.
- 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.
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.
- 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
- 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.
- 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(?).
- 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(?).
- 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(?).
- 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(?).
- 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.)
- These are broad categories assigned by the UIT project.
- 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.
- The ASTRO mission number, either 1 for mission in Dec. 1990 or 2 for that in March 1995
- ID code assigned by the ASTRO missions that identifies each shuttle pointing includes the jotfid which identifies each target
- ID assigned to each astronomical target name by ASTRO missions.
- The "primary" instrument for the observation. The other instruments may have also been exposing in parallel.
- The camera used: "NUV" for the near-UV camera (which failed during the ASTRO-2 mission), or "FUV" for the far-UV camera.
- 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.
- The status of the door. Mostly not entered. All others set to O.
- The time elapsed since the beginning of the mission.
- Exposure time in seconds during spacecraft "day". Only available for ASTRO-1.
- Exposure time in seconds during spacecraft "night". Only available for ASTRO-1.
- Roll Angle.
- Ecliptic Latitude for the observation.
- Ecliptic Longitude for the observation
- Galactic Latitude for the observation.
- Galactic Longitude for the observation.
- The name of the astronomical object.
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