THUILLOT , William

The space astrometry Gaia mission is operating since July 2014 (Gaia Collaboration; Brown, A. et al., 2016; Gaia Collaboration; Prusti, T et al., 2016). As planned, Gaia detects many moving objects in its fields of view during its scanning process of the sky. Several months were necessary to tune the different parameters for filtering these...

The Gaia mission will observe between 2.5 and 3x105 Solar System objects. Most of them will be asteroids. As described elsewhere (Cellino et al. 2007, Tanga et al. 2007, Mignard et al. 2008) Gaia will provide a complete dynamical and physical characterisation of these bodies, that has no comparisons with the datasets ever obtained by a single...

The Institut de mecanique celeste et de calcul des ephemerides (IMCCE, Paris Observatory) is willing to provide information on Solar System objects to the Astronomical Virtual Observatory. The first step is the interconnection of IMCCE ephemerides servers with the Vizier and Aladin tools of the Centre de donnees astronomiques de Strasbourg...

Since October 2016, the short term (ST) processing of Solar System Objects (SSOs) by Gaia is up and running, and it has produced almost 600 alerts. A crucial point in the chain is the possibility of performing a short arc orbit determination as soon as the object has been detected, which allows the follow up of the object from the ground.The...

We report on the status of a project to measure eclipse-induced changes in surface temperature on the major Uranian satellites. Such measurements enable a uniquely direct determination of the thermal inertia, a measure of the resistance to changes in surface temperature. Thermal inertia is a very sensitive indicator for the presence or absence...

We will measure for the first time the thermal inertia of the surfaces of the Uranian satellites Oberon and Titania by observing them during and around solar eclipses due to Uranus. The eclipse events of the Uranian satellites in 2007-2008 represent a unique and rare opportunity, occurring every 42 years, to measure their thermal inertia. We...

Detailed investigations of the capabilities of the Gaia mission have revealed its strong potential for the exploration of scientific issues related to Solar System. This satellite will be placed in the Earth L2 and is expected to provide ˜ 70 observations (composed of ultra-precise astrometric measurements and magnitudes) of all the celestial...

Gaia, the billion of stars surveyor, also regularly observe small bodies from our Solar System. Among those, some are not known at the time of their observation by Gaia. Within the Data Processing and Analysis Consortium, a daily processing as been set in place to release information on when, where, and how to observe these potential...

Gaia will collect asteroid observations over 5 years, with a limiting magnitude V~20 (>300,000 objects). Observations will include very precise astrometry and photometry, and low resolution spectra. Over the last few years, the Coordination Unit 4 of Gaia's Data Processing and Analysis Consortium has built the data reduction pipeline that will...

International audience

International audience

The ESA astrometric mission Gaia has been launched in December 2013. It is currently in its commissioning phase, with the first scientific data expected to be downloaded in June 2014. Gaia has the capability to observe, in addition to about one billion of stars, a large number of solar system objects (SSO) [1]. The satellite and telescope will...

The Gaia ESA space mission will provide astrometric observations of a large number of celestial bodies, with unprecedented accuracy, and in an homogenous reference frame (to become the optical ICRF). The Gaia satellite is monitoring regularly the whole celestial sphere, with one complete scan in about 6month, down to approximately magnitude...

After its successful launch in December 2013, and commissioning period, ESA's astrometric space mission Gaia has now started its scientific operations. In addition to the 3D census of our Milky Way with high precision parallax, proper motion, and other parameters derived for a billion of stars, Gaia will also provide a scientific harvest for...

International audience

The Ground Based Optical Tracking group (GBOT) consists of about ten scientists involved in the Gaia mission by ESA. Its main task is the optical tracking of the Gaia satellite itself [1]. This novel tracking method in addition to radiometric standard ones is necessary to ensure that the Gaia mission goal in terms of astrometric precision level...