1065 Amundsenia
1065 Amundsenia, provisional designation, is a stony asteroid and sizeable Mars-crosser on an eccentric orbit from the inner asteroid belt, approximately 10 kilometers in diameter. It was discovered on 4 August 1926, by Soviet astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Norwegian polar explorer Roald Amundsen.
Orbit and classification
Amundsenia is a Mars-crossing asteroid, a member of the dynamically unstable group, located between the main belt and near-Earth populations, and crossing the orbit of Mars at 1.666 AU. It orbits the Sun in the innermost asteroid belt at a distance of 1.7–3.1 AU once every 3 years and 8 months. Its orbit has an eccentricity of 0.30 and an inclination of 8° with respect to the ecliptic. The body's observation arc begins at Simeiz Observatory with its official discovery observation in 1926.Physical characteristics
In the SMASS classification, Amundsenia is a common stony S-type asteroid.Rotation period
In November 2006, a rotational lightcurve of Amundsenia was obtained from photometric observations by Petr Pravec at Ondřejov Observatory in the Czech Republic. Lightcurve analysis gave a well-defined rotation period of 7.7594 hours with a brightness amplitude between 0.14 and 0.16 magnitude.Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Amundsenia measures between 8.85 and 12.40 kilometers in diameter and its surface has an albedo between 0.151 and 0.399. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 9.75 kilometers based on an absolute magnitude of 12.46.With a diameter of approximately 10 kilometers, Amundsenia is one of the largest mid-sized Mars-crossing asteroids such as 1139 Atami, 1474 Beira, 1011 Laodamia, 1727 Mette, 1131 Porzia, 1235 Schorria, 985 Rosina 1310 Villigera, and 1468 Zomba ; but still smaller than the largest members of this group, namely, 132 Aethra, 323 Brucia, 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are larger than 20 kilometers in diameter.