I/197A Tycho Input Catalogue, Revised version (Egret+ 1992)
The Tycho Input Catalogue. Cross-matching the Guide Star Catalog with
the Hipparcos INCA Data Base
Egret D., Didelon P., McLean B.J., Russell J.L., Turon C.
<Astron. Astrophys. 258, 217, (1992)>
=1992A&A...258..217E 1992A&A...258..217E
ADC_Keywords: Positional data ; Photometry
Mission_Name: Hipparcos
Description:
A Tycho Input Catalogue of three million stars brighter than V=12.1
has been prepared, for the needs of the Tycho mission (Hipparcos
satellite). This catalogue results from the cross-matching of a subset
of the Hubble Space Telescope Guide Star Catalog with the Hipparcos
INCA database. References to these major catalogues, and details about
the cross-matching procedures are to be found in the paper published
in Astron. Astrophys. 258, 217-222 (May 1992).
Among the 3,154,204 stars of the Tycho Input Catalogue, only a bit
more than 1 million will appear in the final Tycho catalogue. A
preliminary selection was done in the Recognition process, that was
based on the first year of the satellite scientific mission (Halbwachs
et al., =1994A&A...281L..25H 1994A&A...281L..25H). 1,049,971 stars were thus selected,
and are flagged in this version of the Tycho Input Catalogue.
The main file contains 3 154 204 records of 80 characters (total size:
256 Mbytes). It is split into four files tic1 to tic4 for easier
manipulations.
An annex file contains the following additional data for a subset of
the stars:
(a) the cross-identification with the Hipparcos Input Catalogue
(117 778 records, flag 26)
(b) the cross-matching with the INCA database (217 625 records,
flag 20). The annex file contains 217 625 records
(64 char., 14 Mbytes).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tic1.dat 80 783952 The catalogue, zones 0/37.5deg
tic2.dat 80 574674 The catalogue, Zones 37.5/90deg
tic3.dat 80 919217 The catalogue, Zones 0/-37.5deg
tic4.dat 80 876361 The catalogue, Zones -37.5/-90deg
tica.dat 64 217625 Annex file, Cross-identifications
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Byte-per-byte Description of file: tic[1-4].dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- TICID1 GSC region number
6- 10 I5 --- TICID2 GSC running number in region
11- 20 I10 10mas RAcs [0/129600000] Right ascension J2000.0
Epoch 1990, in 0.01arcsec
21- 29 I9 10mas SPDcs [0/64800000] South Polar Distance (=Dec+90)
Epoch 1990, in 0.01arcsec
31- 34 I4 10mas ePos ?=0 Error on position in 0.01arcsec
36- 38 I3 cmag e_Bmag ?=0 Error on B mag. in 0.01 mag. (0=unknown)
39- 43 I5 cmag Bmag ?=0 B magnitude in 0.01 mag. (0=unknown)
45- 47 I3 cmag e_Vmag ?=0 Error on V mag. in 0.01 mag. (0=unknown)
48- 52 I5 cmag Vmag V magnitude in 0.01 mag. (0=unknown)
54 I1 --- Flag1 FK5 star
55 I1 --- Flag2 IRS star
56 I1 --- Flag3 Photometric standard for Tycho
57 I1 --- Flag4 Monitor star : random set
58 I1 --- Flag5 Monitor star : selected from TIC flags
59 I1 --- Flag6 Monitor star : NGC, ADS system
60 I1 --- Flag7 Photometric star
61 I1 --- Flag8 Monitor star (logical OR of #1 to #6)
62 I1 --- Flag9 GSC/INCA discrepancy
63 I1 --- Flag10 Star selected in the Recognition process
64 I1 --- Flag11 GSC/INCA magnitude discrepancy
65 I1 --- Flag12 INCA (or CDA) entry NOT in GSC 1.0
66 I1 --- Flag13 Source of position (0: GSC; 1: INCA)
67 I1 --- Flag14 -id.- for B magnitude
68 I1 --- Flag15 -id.- for V magnitude
69 I1 --- Flag16 Non-stellar GSC image ("unknown" class)
70 I1 --- Flag17 Component of TIC pair (sep. < 20")
71 I1 --- Flag18 Close pair with one single entry (sep < 3")
72 I1 --- Flag19 Component of INCA pair (sep < 10")
73 I1 --- Flag20 INCA/CDA star (cross-id. in Annex file)
74 I1 --- Flag21 Known proper-motion
75 I1 --- Flag22 Known high proper-motion (>0.15"/yr)
76 I1 --- Flag23 Known parallax
77 I1 --- Flag24 Known variable
78 I1 --- Flag25 Known multiple system
79 I1 --- Flag26 Hipparcos Input Catalogue star (Annex file)
80 I1 --- Flag27 CDA star (complementary astrometric data)
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Byte-per-byte Description of file: tica.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- TICID1 GSC region number
6- 10 I5 --- TICID2 GSC running number in region
11- 22 A12 --- NCSI CSI number (from SIMBAD and the INCA database)
23- 26 A4 --- Comp Component code (A, B, AB, etc.) or blank
27- 46 A20 --- ID Star Identification (from HD, DM, or
other catalogues)
47- 51 F5.2 mag Dmag ?Mag(GSC) - Mag(INCA)
54- 58 F5.2 arcsec Dpos ?Distance pos(GSC)-pos(INCA) in arcsec.
59- 64 I6 --- HIC ?HIPPARCOS Input Catalogue number
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Notes and warnings concerning the present release:
The following corrections have been applied to the TIC,
generating some differences with respect to the 'operational'
version of TIC described in the Astron. & Astrophysics paper :
o corrected coordinates for high proper motion stars (see
footnote 2 in the A&A Paper). These stars are the stars
with flag 12 (INCA star without GSC counterpart) and flag 22
(proper motion larger than 0.15"/yr). 2130 objects in TIC have
both flags set.
For these stars, the original INCA position (at epoch 1990) have
been searched for, and the correct positions restored.
o additional TIC entries have been assigned a consistent GSC
number provided by the STScI team (rather than a number
starting at 10001); note that the brighter ones (V< 7.5) appear
in GSC version 1.1, with plate name +056.
o in three GSC regions (3588, 5706, and 7899) where the
numbering sequence restarts to 0 after 10000 in the GSC
(in the CD-ROM edition of GSC only the last four digits are
printed), correct numbers have been restored in TIC
(thus in the range 10000-13000).
o The HIC numbers in the annex file have been updated (from
the old IC5 in the 'operational version', to the HIC numbers
as published in ESA SP-1136).
Note that there are 23 HIC duplicates (TIC entries having the
same HIC number : these are A and B components of close systems),
and that there are 110 entries which have been suppressed from
the Hipparcos Catalogue after the start of the mission and before
the publication of the Catalogue (see Table 1 in ESA SP-1136).
o The annex file contains also 60 INCA duplicates (TIC entries having
the same INCA identification); this is due to late corrections
in the INCA file, and the duplicate TIC entry is likely to be
redundant.
See also:
I/196 : Hipparcos Input Catalogue, Version 2 (Turon+, 1993)
I/207 : Preliminary list from Tycho observations (Halbwachs+ 1994)
I/239 : Hipparcos and Tycho Catalogues
Historical Notes:
* 10-Jan-1994: Original version of this file: Jean-Louis Halbwachs [CDS]
* 09-Nov-1994: This file rewritten by N.P.M. Kuin [ADC]
(End) N.P.M. Kuin [ADC] 09-Nov-1994