Prospective Views in Space Astrometry

1982 ◽  
pp. 247-251
Author(s):  
P. Lacroute
Keyword(s):  
Space Astrometry

scholarly journals Microarcsec Astrometry: The Gaia Mission

1998 ◽  
Vol 11 (1) ◽  
pp. 581-582
Author(s):  
L. Lindegren ◽  
M.A.C. Perryman
Keyword(s):  
Accurate Determination ◽  
Distance Measurements ◽  
Profound Impact ◽  
Individual Stars ◽  
The Galaxy ◽  
Direct Distance ◽  
Scientific Potential ◽  
Space Astrometry ◽  
Small Instrument

The Hipparcos mission demonstrated the efficiency of space astrometry (in terms of number of objects, accuracy, and uniformity of results) and the fact that a relatively small instrument can have a very large scientific potential in the area of astrometry. However, Hipparcos could probe less than 0.1 per cent of the volume of the Galaxy by direct distance measurements. Using a larger instrument and more efficient detectors, it is now technically feasible to increase the efficiency of a space astrometry mission by several orders of magnitude, thus encompassing a large part of the Galaxy within its horizon for accurate determination of parallaxes and transverse velocities. Such a mission will have immediate and profound impact in the areas of the physics and evolution of individual stars and of the Galaxy as a whole.

scholarly journals Astrometric Radial Velocities From Hipparcos

1998 ◽  
Vol 11 (1) ◽  
pp. 564-564
Author(s):  
D. Dravins ◽  
L. Lindegren ◽  
S. Madsen ◽  
J. Holmberg
Keyword(s):  
Radial Velocity ◽  
High Precision ◽  
Radial Velocities ◽  
Radial Motion ◽  
Spectral Lines ◽  
Parallel Program ◽  
Stellar Surface ◽  
Space Astrometry ◽  
Stellar Motion ◽  
Surface Convection

Abstract Space astrometry now permits accurate determinations of stellar radial motion, without using spectroscopy. Although the feasibility of deducing astrometric radial velocities from geometric projection effects was realized already by Schlesinger (1917), only with Hipparcos has it become practical. Such a program has now been carried out for the moving clusters of Ursa Major, Hyades, and Coma Berenices. Realized inaccuracies reach about 300 m/s (Dravins et al. 1997). Discrepancies between astrometric and spectroscopic radial velocities reveal effects (other than stellar motion) that affect wavelength positions of spectral lines. Such are caused by stellar surface convection, and by gravitational redshifts. A parallel program (Gullberg & Dravins 1997) is analyzing high-precision spectroscopic radial velocities for different spectral lines in these stars, using the ELODIE radial-velocity instrument atHaute-Provence.

scholarly journals ELSA – training the next generation of space astrometrists

2007 ◽  
Vol 3 (S248) ◽  
pp. 529-530
Author(s):  
L. Lindegren ◽  
A. Bijaoui ◽  
A. G. A. Brown ◽  
R. Drimmel ◽  
L. Eyer ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Data Processing ◽  
Next Generation ◽  
Research Project ◽  
Processing Methods ◽  
Funded Research ◽  
Space Astrometry ◽  
Young Researchers ◽  
Funded Research Project ◽  
Data Processing Methods

AbstractELSA (European Leadership in Space Astrometry) is an EU-funded research project 2006–2010, contributing to the scientific preparations for the Gaia mission while training young researchers in space astrometry and related subjects. Nine postgraduate (PhD) students and five postdocs have been recruited to the network. Their research focuses on the principles of global astrometric, photometric, and spectroscopic measurements from space, instrument modelling and calibration, and numerical analysis tools and data processing methods relevant for Gaia.

IR Space Astrometry

2003 ◽  
pp. 397-404
Author(s):  
Naoteru Gouda ◽  
Takuji Tsujimoto ◽  
Yukiyasu Kobayashi ◽  
Tadashi Nakajima ◽  
Naoki Yasuda ◽  
...  
Keyword(s):  
Space Astrometry

SPACE ASTROMETRY MISSIONS

2020 ◽  
pp. 69-90
Author(s):  
F. Mignard ◽  
S. Roeser
Keyword(s):  
Space Astrometry

Space Astrometry Prospects and Limitations

1986 ◽  
pp. 369-382 ◽  
Author(s):  
J. Kovalevsky ◽  
F. Mignard ◽  
M. Froeschlé
Keyword(s):  
Space Astrometry

scholarly journals Hipparcos – The Esa Space Astrometry Mission: Overview and Status

1986 ◽  
Vol 7 ◽  
pp. 673-682
Author(s):  
M.A.C. Perryman
Keyword(s):  
Satellite Design ◽  
Space Astrometry ◽  
Key Features ◽  
Achievable Accuracy

AbstractThis paper summarises the key features of the Hipparcos satellite design, and presents an overview of the current project status including results of the evaluation of the first hardware items. A recent assessment of the achievable accuracy for the main mission and for Tycho is also presented.

scholarly journals A Proposal for Astrometric Observations From Space

1990 ◽  
Vol 141 ◽  
pp. 77-80 ◽  
Author(s):  
M.S. Chubey ◽  
V.V. Makarov ◽  
V.N. Yershov ◽  
I.I. Kanayev ◽  
V.A. Fomin ◽  
...  
Keyword(s):  
Reference Frame ◽  
Single Observation ◽  
The Earth ◽  
Space Astrometry ◽  
Celestial Reference Frame ◽  
Observational Program

Some aspects of the realisation of a celestial reference frame using a space astrometry facility are considered. An observational program is described, consisting of observing stars up to magnitude 14, radiostars and bright QSO's, planets, asteroids and of laser signals from the Earth. A scheme of an astrometric facility consisting of two telescopes on board the satellite is proposed. The overview strategy with “inita” is estimated, and the estimates of the accuracy of a single observation (0.″02-0.″05) and of the output catalogues (0.″001-0.″007) are made.

Sign in / Sign up

Export Citation Format

Share Document