Echelle spectra of 10 bright asteroids are presented and compared against an observed twilight spectrum and a computed Solar spectrum. Spectra covering a 2130 Å spectral range centered on lambda = 5785 Å are of high resolving power and high signal to noise ratio. We compare detailed properties of spectral lines and not albedo variations. It is...
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2007 (v1)Journal articleUploaded on: December 3, 2022
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2012 (v1)Conference paper
At the beginning of the Gaia mission, it will be necessary to calibrate the 3 instruments, and to have data for performance check. A particular scanning mode will be used, allowing quick multiple observations over a small number of sources. This mode and the selection of corresponding sources are described.
Uploaded on: December 3, 2022 -
2001 (v1)Journal article
We present the discovery of a previously unknown member of the immediate solar neighbourhood, DENIS-P J104814.7-395606.1 (hereafter DENIS 1048-39), identified while mining the DENIS database for new nearby stars. A HIRES echelle spectrum obtained with the 10-m Keck telescope shows that it is an M9 dwarf. DENIS 1048-39 has a very bright apparent...
Uploaded on: June 2, 2023 -
2006 (v1)Journal article
We report the discovery of a new M9.0 dwarf at only 8.2 pc, which we identified in our search for nearby ultracool dwarf (I-J>= 3.0, later than M8.0) in the DENIS data base. We measure a very high proper motion of 2.5arcsecyr-1. The PC3 index measured from its low-resolution spectrum gives a spectrophotometric distance of 8.2 pc. This makes it...
Uploaded on: December 4, 2022 -
2003 (v1)Journal article
Astron. & Astrophys., 401, p. 959 (2003)
Uploaded on: December 3, 2022 -
1998 (v1)Journal article
We use absolute trigonometric parallaxes from the Hipparcos Catalogue to determine individual distances to members of the Hyades cluster, from which the 3-dimensional structure of the cluster can be derived. Inertially-referenced proper motions are used to rediscuss distance determinations based on convergent-point analyses. A combination of...
Uploaded on: July 9, 2024 -
2009 (v1)Conference paper
This poster describes the current organisation of RVS data processing among the Gaia-DPAC (Data Processing & Analysis Consortium), with a particular focus on the French community's contribution.
Uploaded on: December 3, 2022 -
2018 (v1)Journal article
Aims. The Radial Velocity Spectrometer (RVS) on board the ESA satellite mission Gaia has no calibration device. Therefore, the radial velocity zero point needs to be calibrated with stars that are proved to be stable at a level of 300 m s−1 during the Gaia observations.Methods. We compiled a dataset of ~71 000 radial velocity measurements from...
Uploaded on: December 4, 2022 -
2018 (v1)Journal article
Aims. The Radial Velocity Spectrometer (RVS) on board the ESA satellite mission Gaia has no calibration device. Therefore, the radial velocity zero point needs to be calibrated with stars that are proved to be stable at a level of 300 m s−1 during the Gaia observations.Methods. We compiled a dataset of ~71 000 radial velocity measurements from...
Uploaded on: February 22, 2023 -
2005 (v1)Journal article
Monthly Notices of the Royal Astronomical Society, 359, pp. 1306-1335, http://dx.doi.org./10.1111/j.1365-2966..09012.x
Uploaded on: December 4, 2022 -
2019 (v1)Publication
The Radial Velocity Spectrometer (RVS) on board of Gaia having no calibration device, the zero point of radial velocities needs to be calibrated with stars proved to be stable at the level of 300m/s during the Gaia observations. A dataset of about 71000 ground-based radial velocity measurements from five high resolution spectrographs has been...
Uploaded on: December 4, 2022 -
2005 (v1)Journal article
The Gaia mission is designed as a Galaxy explorer, and will measure simultaneously, in a survey mode, the five or six phase-space parameters of all stars brighter than 20th magnitude, as well as providing a description of their astrophysical characteristics. These measurements are obtained by combining an astrometric instrument with...
Uploaded on: December 4, 2022 -
2004 (v1)Journal article
The definition and optimization studies for the Gaia satellite spectrograph, the 'radial velocity spectrometer' (RVS), converged in late 2002 with the adoption of the instrument baseline. This paper reviews the characteristics of the selected configuration and presents its expected performance. The RVS is a 2.0 × 1.6 degree integral field...
Uploaded on: December 4, 2022