2014A&A...571A..85M


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.01CET16:51:00

2014A&A...571A..85M - Astronomy and Astrophysics, volume 571A, 85-85 (2014/11-1)

Joint astrometric solution of HIPPARCOS and Gaia. A recipe for the Hundred Thousand Proper Motions project.

MICHALIK D., LINDEGREN L., HOBBS D. and LAMMERS U.

Abstract (from CDS):

The first release of astrometric data from Gaia is expected in 2016. It will contain the mean stellar positions and magnitudes from the first year of observations. For more than 100 000 stars in common with the Hipparcos Catalogue it will be possible to compute very accurate proper motions due to the time difference of about 24 years between the two missions. This Hundred Thousand Proper Motions (HTPM project is planned to be part of the first release. Our aim is to investigate how early Gaia data can be optimally combined with information from the Hipparcos Catalogue in order to provide the most accurate and reliable results for HTPM. The Astrometric Global Iterative Solution (AGIS was developed to compute the astrometric core solution based on the Gaia observations and will be used for all releases of astrometric data from Gaia. We adapt AGIS to process Hipparcos data in addition to Gaia observations, and use simulations to verify and study the joint solution method. For the HTPM stars we predict proper motion accuracies between 14 and 134µas/yr, depending on stellar magnitude and amount of Gaia data available. Perspective effects will be important for a significant number of HTPM stars, and in order to treat these effects accurately we introduce a formalism called scaled model of kinematics (SMOK). We define a goodness-of-fit statistic which is sensitive to deviations from uniform space motion, caused for example by binaries with periods of 10-50 years. HTPM will significantly improve the proper motions of the Hipparcos Catalogue well before highly accurate Gaia-only results become available. Also, HTPM will allow us to detect long period binary and exoplanetary candidates which would be impossible to detect from Gaia data alone. The full sensitivity will not be reached with the first Gaia release but with subsequent data releases. Therefore HTPM should be repeated when more Gaia data become available.

Abstract Copyright:

Journal keyword(s): astrometry - methods: data analysis - methods: numerical - space vehicles: instruments - proper motions - planets and satellites: detection

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 HD 225213 Er* 00 05 24.4278018131 -37 21 26.504223709 11.074 10.022 8.562 7.589 6.432 M2V 185 0
2 HD 33793 Ro* 05 11 40.5893175460 -45 01 06.353955874 11.624 10.433 8.853 7.9 6.899 M1VIp 286 0
3 HD 95735 Er* 11 03 20.19400 +35 58 11.5682 10.030 8.960 7.520 5.99 4.79 M2+V 631 0
4 BD+44 2051 PM* 11 05 28.57798 +43 31 36.3914 11.440 10.270   7.9   M1.0Ve 271 0
5 HD 103095 PM* 11 52 58.7683801554 +37 43 07.240082865 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 750 1
6 HD 120793 * 13 52 00.6772737868 -19 54 50.723825434   10.69 10.41     F0/2(V) 7 0
7 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 994 0
8 HD 134440 PM* 15 10 12.9678041572 -16 27 46.510775897 10.69 10.217 9.426 8.913 8.441 K2V 258 0
9 HD 134439 PM* 15 10 13.0874231858 -16 22 45.866399625 10.03 9.837 9.066 8.604 8.160 sd:K1Fe-1 301 0
10 BD+18 3167 * 16 22 16.1415876966 +18 32 13.868444460   11.80 10.85     K0 9 0
11 BD+18 3167B * 16 22 17.0900199077 +18 32 02.073096259   11.65 10.74     ~ 7 0
12 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 672 2
13 * 61 Cyg A BY* 21 06 53.9396100677 +38 44 57.897024357 7.50 6.39 5.21 4.19 3.54 K5V 952 0
14 * 61 Cyg B Er* 21 06 55.2640651855 +38 44 31.362140913 8.63 7.40 6.03 4.86 3.55 K7V 672 1

    Equat.    Gal    SGal    Ecl

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2020.12.01-16:51:00

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