VI/145 ASC Gaia Attitude Star Catalog (Smart, 2015)
The Gaia Attitude Star Catalog ASC
Smart, R. L.
=2015yCat.6145....0S 2015yCat.6145....0S
ADC_Keywords: Astrometric data
Keywords: Positional_Data
Mission_Name: Gaia
Description:
The ASC is a compilation produced for the Gaia mission.
We have combined data from the following catalogs or datasets to
produce a homogenous list of positions, proper motions, photometry
in a blue and red band and estimates of the magnitudes in the Gaia
G and G_RVS bands: Tycho2, UCAC4, Hipparcos, PPMXL, GSC2.3 and Sky2000.
Originally ASC sources were selected from the Initial Gaia Source List
(IGSL, I/324). However, here we produce a cleaner catalog starting from
the bright source catalogs and using the following criteria:
1) The candidate must be in the Tycho2, UCAC4, Hipparcos or Sky2000
catalog.
2) The Gaia G magnitude must be brighter than 13.4.
3) The star must be isolated from other objects of similar magnitudes
4) The object must not be in the Washington Double Star catalog
5) If a healpix 6th region has more than 1000 objects the magnitude
limit is reduced to reduce the number of objects in that region.
Since the ASC was produced independently from the IGSL using different
procedures there is not a direct 1 to 1 match between ASC and IGSL
entries. We have matched the ASC to the IGSL and found that 9 out of
the 8 million entries do not have a clear match. Since there may still
remain ambiguous matches in the 8 million matched objects, we decided
to assign the sourceIDs of the IGSL with the adjustment that the
runningnumber is equal to the IGSL runningnumber + 320000.
Included Catalogs: Tycho2, UCAC4, Sky2000, HIPPARCOS for candidates and
the PPMXL, GSC2.3 were used to calculating magnitudes.
File Summary:
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FileName Lrecl Records i Explanations
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ReadMe 80 . This file
attitude.sam 202 1000 Sample of Gaia Attitude Star Catalog (ASC)
attitude.csv . 8633831 Source data in CSV (comma-separated) format
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See also:
I/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)
VI/137 : GaiaSimu Universe Model Snapshot (Robin+, 2012)
V/145 : SKY2000 Master Catalog, Version 5 (Myers+ 2006)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
Byte-by-byte Description of file: attitude.sam
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Bytes Format Units Label Explanations
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1- 19 I19 --- sourceId Source identifier
21- 30 F10.6 deg RAdeg Right Ascension at J2000 (alpha)
32- 41 F10.6 deg DEdeg Declination at J2000 (delta)
43- 48 F6.3 mag magBJ GSC2.3 B mag (magBJ)
50- 55 F6.3 mag magRF GSC2.3 R mag (magRF)
57- 62 F6.3 mag magG G mag estimate (magG)
64- 69 F6.3 mag magGrvs Grvs mag estimate (magGrvs)
71- 76 F6.3 mag e_magBJ Standard error on magBJ (magBJError)
78- 83 F6.3 mag e_magRF Standard error on magRF (magRFError)
85- 90 F6.3 mag e_magG Error in G mag estimate (magGError)
92- 97 F6.3 mag e_magGrvs Error in Grvs mag estimate (magGrvsError)
99-103 F5.3 arcsec e_RAdeg Error in Right Ascension (alphaError)
105-109 F5.3 arcsec e_DEdeg Error in Declination (deltaError)
111-119 F9.4 yr EpRA Mean Epoch of Right Ascension (alphaEpoch)
121-129 F9.4 yr EpDE Mean Epoch of Declination (deltaEpoch)
131-132 I2 --- src Position source (sourcePosition) (1)
134-140 F7.1 mas/yr pmRA ? Proper motion in RA (muAlpha) (4)
142-148 F7.1 mas/yr pmDE ? Proper motion in DEC (muDelta) (4)
150-155 F6.1 mas/yr e_pmRA ? Error in Proper motion in RA (muAlphaError)
157-162 F6.1 mas/yr e_pmDE ? Error in proper motion in DEC (muDeltaError)
164-165 I2 --- r_pm Proper motion source (sourceMu) (1)
167-168 I02 --- r_magBJ BJ magnitude source (sourceMagBJ) (2)
170-171 I02 --- r_magRF RF magnitude source (sourceMagRF) (2)
173-174 I02 --- r_magG G magnitude source (sourceMagG) (2)
176-177 I02 --- r_magGrvs Grvs magnitude source (sourceMagGrvs) (2)
179-179 I1 --- cl Classification as 0=star, 1=nonstars
(classification)
181-182 I2 --- r_cl Classification source
(sourceClassification) (1)
184-184 I1 --- GSC23 [0/1] In GSC2.3 catalog (I/305) (auxGSC23) (3)
186-186 I1 --- SDSS [0] In SDSS catalog (auxSDSS) (3)
188-188 I1 --- UCAC [0/1] In UCAC4 catalog (I/322) (auxUCAC) (3)
190-190 I1 --- LQRF [0] In LQRF (I/313) (auxLQRF) (3)
192-192 I1 --- TYCHO [0/1] In TYCHO2 catalog (I/259) (auxTYCHO) (3)
194-194 I1 --- HIP [0/1] In Hipparcos catalog(I/311) (auxHIP) (3)
196-196 I1 --- PPMXL [0/1] In PPMXL catalog (I/317) (auxPPMXL) (3)
198-198 I1 --- OGLE [0] In OGLE catalog (auxOGLE) (3)
200-200 I1 --- TMASS [0] In Two MASS PSC (auxTMASS) (3)
202-202 I1 --- EPC [0] In Ecliptic Poles Catalog (auxEPC) (3)
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Note (1): Position, proper motion and classification source catalogs
are identified by a number following this convention:
1 = 2008AJ....136..735L 2008AJ....136..735L Guide Star Catalog, GSC2.3 (I/305)
3 = 2010AJ....139.2184Z 2010AJ....139.2184Z U.S. Naval Observatory CCD Astrograph Catalog,
UCAC3 (I/315)
5 = 2000A&A...355L..27H 2000A&A...355L..27H Tycho-2 (I/259)
49 = 2010AJ....139.2440R 2010AJ....139.2440R Large PPM catalog, PPMXL (I/317)
68 = http://mmfd.gsfc.nasa.gov/dist/generalProducts/attitude/ATT_SKYMAP.html
Note (2): The source of the magnitudes are given based on the following codes:
01 = RF/BJ value from GSC2.3 (I/305); σ=0.3
02 = RF/BJ value from PPMXL (I/317); σ=0.4
10 = RF = V - 0.0478 - 0.5739(B-V) - 0.0938(B-V)2 - 0.4606(B-V)3
+ 0.8419(B-V)4 - 0.3472(B-V)5;
σ=σ(B);
[valid only for (B-V)<2.5]
11 = RF = R - 0.0066 - 0.0563(V-R) - 0.2505(V-R)2 + 0.3912(V-R)3
- 0.0707(V-R)4;
σ=σ(V)
12 = RF = V - 0.0137 - 0.5573(V-I);
σ=sqrt(σ(V)2+σ(I)2)
13 = BJ = V + 0.0036 + 0.8768(B-V) - 0.0594(B-V)2;
σ=σ(B);
[valid only for (B-V)<2.5]
14 = BJ = R - 0.0480 + 2.4850(V-R) - 0.8760(V-r)2 + 2.9117(V-r)3
- 3.4144(V-r)4 + 1.11850(V-r)5;
σ=σ(V)
15 = BJ = V + 0.0442 + 0.7851(V-I);
σ=sqrt(σ(V)2+σ(I)2)
16 = RF = VT - 0.0478 - 0.578(BT-VT) - 0.0677(BT-VT)2
- 0.2828(BT-VT)^3 + 0.4395(BT-VT)4
+ 0.1541(BT-VT)5;
σ=σ(VT),
[valid only for (BT-VT)<2.5]
17 = BJ = VT - 0.0036 + 0.655(BT-VT) - 0.0429(BT-VT)2;
σ=σ(BT);
[valid only for (BT-VT)<2.5]
18 = RF = r + 0.1784 + 0.1187(g-r+0.259) + 0.0195(g-r+0.259);
σ=sqrt(0.04+σ(r)2)
19 = BJ = g + 0.0880 + 0.2434(g-r+0.259) + 0.0439(g-r+0.259);
σ=sqrt(0.04+σ(g)2)
20 = BJ = Vp + 0.3608 + 1.40985(Vp - RF);
σ=0.5
21 = BJ = RF + 0.3841 + 1.97440(RF - IN);
σ=0.5
28 = G = VT - 0.0246 - 0.3354(BT-VT) - 0.02558(BT-VT)2
- 0.05153(BT-VT)3;
σ=sqrt(0.2916+σ(VT)2+σ-BT)2)
29 = GRVS = VT - 0.1313 - 1.3422(BT-VT) - 0.09316(BT-VT)2
- 0.0663(BT-VT)3;
σ=sqrt(0.2916+σ(VT)2+σ-BT)2)
30 = G = g - 0.1128 - 0.5264(g-i) - 0.0869(g-i)2 + 0.0025(g-i)3;
σ=sqrt(0.082+σ(g)2+σ(i)2)
31 = GRVS = g - 0.4994 - 1.2026(g-i) - 0.0202(g-i)2 + 0.0021(g-i)3;
σ=sqrt(0.112+σ(g)2+σ(i)2)
32 = G = g - 0.089 - 0.8543(g-r) - 0.1281(g-r)2 + 0.0471(g-r)3;
σ=sqrt(0.1681+σ(g)2+σ(r)2)
33 = GRVS = g - 0.4332 - 1.8906(g-r) - 0.0231(g-r)2 - 0.0329(g-r)3;
σ=sqrt(0.2401+σ(g)2+σ(r)2)
41 = BJ = J + 4.9816 - 0.38945670(J-K);
σ=0.5
42 = RF = J + 2.6997 - 0.46257863(J-K);
σ=0.5
50 = G = RF - 0.0158 + 0..2915(BJ-RF) - 0.0347(BJ-RF)2
- 0.0301(BJ-RF)3;
σ=0.4
51 = GRVS = RF - 0.0974 - 0.4830(BJ-RF) - 0.0184(BJ-RF)2
- 0.0178(BJ-RF)3;
σ=0.5
52 = G = V - 0.0247 - 0.2888(B-V) - 0.0353(B-V)2 - 0.0839(B-V)3;
σ=0.6
54 = G = V - 0.0208 - 0.1004(V-I) - 0.1593(V-I)2 + 0.0083(V-I)3;
σ=sqrt(σ(V)2+σ(I)2)
55 = GRVS = V - 0.1333 - 1.4654(B-V) - 0.1075(B-V)2 - 0.0768(B-V)3;
σ=0.6
57 = GRVS = V - 0.0501 - 1.1667(V-I) - 0.0052(V-I)2 + 0.0011(V-I)3;
σ=sqrt(σ(V)2+σ(I)2)
58 : G = V_T - 0.0246 - 0.335(BT-VT) - 0.0256(BT-VT)^2
- 0.0515(BT-VT)^3 ; σ= 0.54
59 : G_RVS = V_T - 0.1313 - 1.342(BT-VT) - 0.0932(BT-VT)^2
- 0.0663(BT-VT)^3 ; σ= 0.56
80 = G = value from GEPC
81 = GRVS = value from GEPC
Note (3): The auxXXXX toggles are 1 if the entry was matched in the indicated
catalog XXXX, 0 if not. The auxSDSS, auxLQRF, auxOGLE, auxTMASS, and
auxEPC are always 0 as these catalogs were not used, the fields have
been kept to keep consistency with the IGSL.
Note (4): Any object with proper motions higher than 3276.7 mas/yr that were
taken from the UCAC catalog and erroneously read as
pmRA=3276.7, pmDE=3276.7 had their proper motions set to
pmRA=NULL, pmDE=NULL
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History:
Data received from Richard Smart
Acknowledgements: Richard Smart [OATo/INAF, Italy]
References:
Article: The Gaia Attitude Star Catalog
Corresponding author: Dr. R. L. Smart
E-mail address:
Journal: Astronomy and Computing
Our reference: ASCOM135
PII S2213-1337(16)00005-6
DOI: 10.1016/j.ascom.2016.01.004
(End) Arnaud Siebert, Thomas Boch [CDS] 9-April-2015