TANGA , Paolo

The observers in a ground-based network for Gaia support need to be aware of the properties of Gaia data for being able to exploit the information which is provided by the data processing chain. The case of Solar System objects is introduced, along with the potential of scientific exploitation. It is expected that Gaia will mainly contribute in...

The determination of bulk physical properties for the largest possible number of asteroids which will be observed by Gaia is an important task which can be made easier by performing some dedicated groundbased observing campaigns. The proposed actions, consisting of applications of different observing techniques, primarily photometry and...

We will discuss some specific applications to the rotation state and the shapes of moderately large asteroids, and techniques of observations putting some emphasis on the HST/FGS instrument.

International audience

Multiple sources of evidence suggest that asteroids ranging from hundreds meters to few kilometers in size are rubble piles, i.e. gravitational aggregates of loosely consolidated material. However, no direct data on their internal structure is available to date. Cohesion between rubble-pile building blocks has been invoked in the past to...

The Gaia mission will operate over five years, nominally starting from 2011. Several tens of accurate astrometric and photometric measurements of each of the Solar System bodies will be available. In this work we focus on the specific case of the moons of Mars, whose positions will be known with an uncertainty better than 0.05 mas, never...

The Gaia ESA space mission has started to provide its harvest with the first Gaia data release DR1, published in September 2016. Gaia DR1 provides positions for about 1 billion stars and proper motion for the Tycho-Gaia TGAS of 2 million stars with unprecedented accuracy. The second data release DR2 will be the major step in the Gaia mission,...

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Recent works have shown that the thermal inertia of km-sized near-Earth asteroids (NEAs) is more than two orders of magnitude higher than that of main belt asteroids (MBAs) with sizes (diameters) between 200 and 1,000 km. This confirms the idea that large MBAs, over hundreds millions of years,have developed a fine and thick thermally insulating...

National audience

Since the beginning of its scientific programme, in mid-2014, the ESA space mission Gaia has regularly scanned the whole scan, providing astrometry, spectrometry, and spectro-photometry, of about a billion of stars and also Solar System Objects (SSOs). Although it is not specifically designed for observation of moving objects, the Gaia...

The recently discovered near-Earth asteroid 2021 PH27 has the shortest orbital period of all known asteroids. It cannot be excluded that 2021 PH27 is also an active asteroid, as (3200) Phaethon. We intend to estimate the consequences of this hypothesis, although testing is difficult with ground-based observations during perihelion passages, due...

The Gaia space mission to be operated in early 2012 by the European Space Agency (ESA), will make a huge step in our knowledge of the Sun's neighbor-hood, up to the Magellanic clouds. Somewhat closer, Gaia will also provide ma jor improvements in the science of asteroids, and more generally to our Solar System, either directly or indirectly....

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...

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The simple evidence that asteroid are composed by solid rocks suggests that their shape can be rather far from the theoretical equilibrium for rotating fluid bodies. The possible fragmented ("rubble-pile") nature of most of them has suggested interpretations based on elasto-plastic models (such as the Mohr-Coulomb theory) that take into account...

The Gaia satellite, an ESA cornerstone mission to be launched at the end of the year 2011, will observe a large number of celestial bodies including also small bodies of the solar system. Albeit spread from the inner to the outer regions of the solar system, these are mainly near-Earth objects and main-belt asteroids. All objects brighter than...

We present in the following some capabilities of the Gaia mission for performing local test of General Relativity (GR) based on the astrometry of asteroids. This ESA cornerstone mission, to be launched in Spring 2012, will observe---in addition to the stars and QSOs---a large number of small solar system bodies with unprecedented photometric...

The Gaia satellite, planned for launch by the European Space Agency (ESA) in 2013, is the next generation astrometry mission following Hipparcos. While mapping the whole sky, the Gaia space mission is expected to discover thousands of Solar System Objects. These will include Near-Earth Asteroids and objects at Solar elongations as low as 45...

In 2021, the Gaia mission will release its third data set of measurements including for the first time thousands of reflectance spectra of asteroids. For the final release of Gaia, this number is expected to increase to 100 000. The reflectance spectra are derived from spectro-photometric detectors covering wavelengths from blue to red (from...

Knowing the asteroid belt is the key to provide a reliable history ofour solar system. The main question which has been raised in the lastyears is: given our available data, does our classification ofasteroid into families provide a reliable history of the collisionalevolution of our solar system?We have done huge steps forward, but the real...

After the catastrophic disruption of a parent body, new objects are formed by the re-accumulation of the resulting fragments. A new dynamical family is thus formed. This phase is dominated by gravity, and the resulting bodies are cohesionless gravitational aggregates, also known as "rubble piles". Several lines of evidence suggest that a large...

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...

Apart from producing a huge improvement in the determination of asteroid orbits, Gaia is also expected to trigger a revolution in the field of the determination of asteroid physical properties. This includes the determination of accurate values of the mass and bulk density for about 100 of the largest objects in the main belt; the determination...

International audience