63 Ausonia


Ausonia is a stony Vestian asteroid from the inner region of the asteroid belt, approximately 100 kilometers in diameter. It was discovered by Italian astronomer Annibale de Gasparis on 10 February 1861, from the Astronomical Observatory of Capodimonte, in Naples, Italy. The asteroid was named Ausonia, after the ancient classical name for the Italian region.

Orbit and classification

Ausonia is a member of the Vesta family. Vestian asteroids have a composition akin to cumulate eucrites and are thought to have originated deep within 4 Vesta's crust, possibly from the Rheasilvia crater, a large impact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision. Vesta is the main belt's second-largest and second-most-massive body after Ceres.
It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.7 AU once every 3 years and 9 months. Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic.

Physical characteristics

Ausonia was in a study using the Hubble FGS. Other studied asteroids included 15 Eunomia, 43 Ariadne, 44 Nysa, and 624 Hektor.

Spectral type

In the Tholen classification, Ausonia is a stony S-type asteroid, while in the SMASS classification, it is an Sa-subtype, that transitions from the S-type to the uncommon A-type asteroid. The body's stony composition has also been confirmed by polarimetric observations in 2017.

Photometry

In 1976, Ausonia was the subject of a photometric study by the Observatory of Turin in Italy. A lighcurve of Ausonia was obtained with the ESO 0.5-metre telescope at La Silla Observatory in 1980.

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Ausonia measures between 87.47 and 116.044 kilometers in diameter and its surface has an albedo between 0.125 and 0.25. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2082 and a diameter of 90 kilometers based on an absolute magnitude of 7.55.

Binary status

Based on its lightcurve, a small moon had been suggested but never confirmed.

Naming

The initial choice of name for the asteroid was "Italia", after Italy, but this was modified to Ausonia, an ancient classical name for the Italian region.