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This is the Hubble Space Telescope (HST) Archived Exposures Catalog (AEC) as obtained from the Space Telescope Science Institute (STScI) Archive, where it was created from a compilation of their Archive and Proposal databases. This database provides a summary of all completed HST observations, including both solar system and fixed (i.e., cosmic) targets. Exposures are included here after they have been archived at STScI. Notice that solar system objects ahould be searched for by name, not by position. Much more information can be obtained about each exposure, and the data themselves can be retrieved using STScI's Multimission Archive (the URL is http://archive.stsci.edu/hst/) or STScI's Archive Web Interface (the URL is http://archive.stsci.edu/hst/search.php). This HEASARC version of the HSTAEC is updated on a monthly basis, based on data files obtained from the STScI Web site each month.
Note that when the HEASARC ingested this catalog, (i) a number of entries were found with missing or null positional co-ordinates, i.e., RA and Dec values, which we have set to be at (RA, Dec) = (0,0) in equinox J2000, and (ii) 186 entries were found with clearly erroneous observation dates, e.g., Nov 17 1858, which the HEASARC has changed to null values.
This is the HST Planned and Archived Exposures Catalog (PAEC) as obtained from the Space Telescope Science Institute (STScI) Archive which created the original compilation from their Archive and Proposal databases. This database table provides a summary of all approved HST observations, including already completed observations and those which are planned to be executed as part of the current cycle or are reserved for execution by Guaranteed Time Observer (GTO) programs for the upcoming cycles.
This database table provides a summary of both planned and completed HST observations. Much more information can be obtained about each exposure, and the data themselves can be retrieved, using STScI's Multimission Archive (URL is http://archive.stsci.edu/hst/) or STScI's Archive Web Interface (URL is http://archive.stsci.edu/hst/search.php). Note that a number of solar system and other objects have 0 values for their 2000 equinox RA and declination coordinates in the original HST table and hence also in this HEASARC database.
This HEASARC version of the HSTPAEC will be updated on a regular basis, usually within one month of the data files on the STScI Web site (URL http://archive.stsci.edu/hst/paec.html) being updated.
The Hubble Ultra Deep Field (UDF, Principle Investigator: Steven V. W. Beckwith) is a 400-orbit Hubble Space Telescope (HST) Cycle 12 program to image a single field of the Wide Field Camera (WFC) of the Advanced Camera for Surveys (ACS) in four filters: F435W (B), F606W (V), F775W (i), and F850LP (z). The observations took place over 4 months from September 2003 to January 2004 under two program IDs: 9978 and 10086.
The observations consist of half-orbit exposures, cycling through each of the filters in a 4-point dither pattern to provide sub-pixel sampling, as well as a larger-scale 3-point line pattern to cover the 2 second of arc gap between the two ACS/WFC chips. The total exposure times are summarized below, with typical exposure times of 1200s for individual images. The AB magnitude zero-points for ACS are current as of March 2004.
Number of Number of Total Exp. AB mag.
Orbits Exposures Time (s) zero-point
B (F435W): 56 112 134880 25.673
V (F606W): 56 112 135320 26.486
i (F775W): 144 288 347110 25.654
z (F850LP): 144 288 346620 24.862
This HEASARC Browse table contains the list of sources found in the deepest
UDF image, the i-band image. The formal i-band catalog contains a total of
10,040 sources. A visual inspection of all the sources revealed an additional
5 spurious sources (which do not form part of the catalog). Moreover,
the deblending algorithms in SExtractor caused an additional 100 sources to
be missed, owing to their proximity to brighter sources. These sources were
identified manually, and formally added by doing another SExtractor run with
considerably different deblending parameters, in order to detect them all.
An initial list of 208 sources was produced, which was then reduced to a
total of 100 sources after visual inspection and rejection of sources that
were clearly part of previously identified sources. These additional sources
are denoted by ID numbers 20001 - 20208.
Although the i-band image is the deepest image, there remain additional sources that were not detected in i-band, even though they may be detected in one of the other bands. Therefore, the authors produced a second catalog based on detection in the z-band image (not part of the present table), and an additional 39 sources are included from this catalog that were detected at > 10 sigma in the z-band image, but were not in the catalog that was run using the i-band image for detection. These additional sources are denoted by ID numbers above 30000. More details are found in the file ftp://cdsarc.u-strasbg.fr/pub/cats/II/258/intro.txt or from the UDF home page at http://www.stsci.edu/hst/udf/.
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