2016A&A...595A...4L


Query : 2016A&A...595A...4L

2016A&A...595A...4L - Astronomy and Astrophysics, volume 595A, 4-4 (2016/11-1)

Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes.

LINDEGREN L., LAMMERS U., BASTIAN U., HERNANDEZ J., KLIONER S., HOBBS D., BOMBRUN A., MICHALIK D., RAMOS-LERATE M., BUTKEVICH A., COMORETTO G., JOLIET E., HOLL B., HUTTON A., PARSONS P., STEIDELMULLER H., ABBAS U., ALTMANN M., ANDREI A., ANTON S., BACH N., BARACHE C., BECCIANI U., BERTHIER J., BIANCHI L., BIERMANN M., BOUQUILLON S., BOURDA G., BRUSEMEISTER T., BUCCIARELLI B., BUSONERO D., CARLUCCI T., CASTANEDA J., CHARLOT P., CLOTET M., CROSTA M., DAVIDSON M., DE FELICE F., DRIMMEL R., FABRICIUS C., FIENGA A., FIGUERAS F., FRAILE E., GAI M., GARRALDA N., GEYER R., GONZALEZ-VIDAL J.J., GUERRA R., HAMBLY N.C., HAUSER M., JORDAN S., LATTANZI M.G., LENHARDT H., LIAO S., LOFFLER W., McMILLAN P.J., MIGNARD F., MORA A., MORBIDELLI R., PORTELL J., RIVA A., SARASSO M., SERRALLER I., SIDDIQUI H., SMART R., SPAGNA A., STAMPA U., STEELE I., TARIS F., TORRA J., VAN REEVEN W., VECCHIATO A., ZSCHOCKE S., DE BRUIJNE J., GRACIA G., RAISON F., LISTER T., MARCHANT J., MESSINEO R., SOFFEL M., OSORIO J., DE TORRES A. and O'MULLANE W.

Abstract (from CDS):

Context. Gaia Data Release 1 (DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase.
Aims. We give a brief overview of the astrometric content of the data release and of the model assumptions, data processing, and validation of the results.
Methods. For stars in common with the HIPPARCOS and Tycho-2 catalogues, complete astrometric single-star solutions are obtained by incorporating positional information from the earlier catalogues. For other stars only their positions are obtained, essentially by neglecting their proper motions and parallaxes. The results are validated by an analysis of the residuals, through special validation runs, and by comparison with external data.
Results. For about two million of the brighter stars (down to magnitude ∼11.5) we obtain positions, parallaxes, and proper motions to HIPPARCOS-type precision or better. For these stars, systematic errors depending for example on position and colour are at a level of ±0.3 milliarcsecond (mas). For the remaining stars we obtain positions at epoch J2015.0 accurate to ∼10mas. Positions and proper motions are given in a reference frame that is aligned with the International Celestial Reference Frame (ICRF) to better than 0.1mas at epoch J2015.0, and non-rotating with respect to ICRF to within 0.03mas/yr. The HIPPARCOS reference frame is found to rotate with respect to the Gaia DR1 frame at a rate of 0.24mas/yr.
Conclusions. Based on less than a quarter of the nominal mission length and on very provisional and incomplete calibrations, the quality and completeness of the astrometric data in Gaia DR1 are far from what is expected for the final mission products. The present results nevertheless represent a huge improvement in the available fundamental stellar data and practical definition of the optical reference frame.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astrometry - parallaxes - proper motions - methods: data analysis - space vehicles: instruments - reference systems

VizieR on-line data: <CDS Catalogue: I/337>

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* S Per s*r 02 22 51.7113133056 +58 35 11.422774248 13.22 10.55 7.90     M4.5-7Iae 376 0
2 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 850 2
3 V* V1271 Tau RS* 03 43 48.3323982308 +25 00 15.795725924   12.47 11.62 11.69   ~ 74 0
4 HD 283447 Or* 04 14 12.9261150912 +28 12 12.359055168 13.17 12.07 10.68 9.45 8.67 K3Ve 417 0
5 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1404 1
6 V* T Lep Mi* 05 04 50.8451254800 -21 54 16.520551560   10.99 7.40     M6ev 148 0
7 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1563 0
8 HD 95735 Er* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 713 0
9 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5797 1
10 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1296 0
11 HD 127910 * 14 29 49.5225560808 +72 15 31.195691964   9.84 8.42     K5 10 0
12 * sig CrB A SB* 16 14 40.8534439608 +33 51 31.011629868   6.14 5.55     F6V 53 1
13 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 810 2
14 NAME Baade Window reg 18 03.5 -30 01           ~ 612 3
15 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4330 0
16 HD 199178 Ro* 20 53 53.6520433056 +44 23 11.080108284   8.01 7.22     G5III-IV 213 1
17 V* AR Lac RS* 22 08 40.8182089680 +45 44 32.107863120 7.09 6.83 6.11     K0IVe+G5IV 723 0
18 V* IM Peg RS* 22 53 02.2663977960 +16 50 28.300547040   7.024 5.890     K2III 338 1
19 V* PZ Cas s*r 23 44 03.2814215136 +61 47 22.190200476 12.80 11.48 8.90 6.08 3.90 M3Ia 202 0

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