I/254 The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)
The Guide Star Catalog Version 1.2: an astrometric recalibration and
other refinements.
Morrison J.E., Roeser S., McLean B., Bucciarelli B., Lasker B.
<Astron. J., 121, 1752 (2001)>
=2001AJ....121.1752M 2001AJ....121.1752M
ADC_Keywords: Surveys ; Positional data
Description:
The Guide Star Catalog (GSC), which has been constructed to support
the operational need of the Hubble Space Telescope contains nearly 19
million objects brighter than sixteenth magnitude, of which more than
15 million are classified as stars. This catalog provides positions
and magnitudes for these stars.
The original version of this catalog, GSC 1.0, is described in a
series of papers: Lasker et al. (1990AJ.....99.2019L 1990AJ.....99.2019L);
Russell et al. (1990AJ.....99.2059R 1990AJ.....99.2059R); and
Jenkner et al. (1990AJ.....99.2082J 1990AJ.....99.2082J)
The reference material for the GSC 1.2 reduction is the "Positions and
Proper Motions Catalogue":
PPM-North, Roeser S. and Bastian U., 1988, Cat. I/146
PPM-South, Bastian U. and Roeser S., 1993, Cat. I/193
PPM-Suppl, Roeser S., Bastian U. and Kuzmin A., 1994, Cat. I/208
and the Astrographic Catalogue (AC) which was used to remove the mean
systematics common to all the plates.
The overall rms error of the GSC 1.2 is estimated better than 0.3arcsec
The STScI provides the details of the GSC versions
("See also" section below)
A binary version of the GSC1.2, with C code for querying, is available
in the subdirectory GSC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
out.sam 68 100 Sample output (out of 25,258,765 positions)
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See also:
http://gsss.stsci.edu/catalogs/gsc/GSC1/gsc12/DESCRIPTION.HTM : GSC 1.2 page
I/220 : The HST Guide Star Catalog, Version 1.1 (Lasker+ 1992)
Byte-by-byte Description of file: out.sam
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Bytes Format Units Label Explanations
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1- 10 I10 --- GSC *GSC designation
12- 20 F9.5 deg RAdeg Right ascension in J2000, epoch of plate
22- 30 F9.5 deg DEdeg Declination in J2000, epoch of plate
33- 36 F4.1 arcsec PosErr Mean error on position
38- 42 F5.2 mag Pmag photographic magnitude (see n_Pmag)
44- 47 F4.2 mag e_Pmag Mean error on photographic magnitude
49- 50 I2 --- n_Pmag *[0,18] Coded passband for magnitude
52 I1 --- Class [0,3] Class of object (0=star; 3=non-stellar)
54- 57 A4 --- Plate *Plate designation
59- 66 F8.3 yr Epoch *? Epoch of plate
68 A1 --- Mult [TF] True if multiple object / False otherwise
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Note on GSC: the GSC Identification is made of a plate number
(5 digits) and star number on the plate (5 digits); note that,
in the literature, a dash separates generally the two parts.
Note on n_Pmag: the number designates the following combination
of emulsion and filter:
magband emulsion filter Notes
------- -------- -------- -----------------------
0 IIIaJ GG395 SERC-J/EJ
1 IIaD W12 Pal Quick-V
3 --- B Johnson
4 --- V Johnson
5 IIIaF RG630 Red
6 IIaD GG495 Pal QV/AAO XV
7 103aO --- POSS-I Blue
8 103aE red plex POSS-I Red
10 IIaD GG495 GPO Astrograph
11 103aO GG400 Black Birch Astrograph
16 IIIaJ GG495 QV
18 IIIaJ GG385 POSS-II Blue
------- -------- -------- -----------------------
Note on Plate, Epoch: two plates (+056 and +017) represent data from
catalogues (mainly Hipparcos Input Catalogue, Cat. I/196).
They have no associated epoch.
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(End) Brian McLean [STScI], Francois Ochsenbein [CDS] 08-May-1999