1671 Chaika
1671 Chaika, provisional designation , is a background asteroid from the Astraea region in the central asteroid belt, approximately in diameter. It was discovered on 3 October 1934, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The assumed S-type asteroid has a rotation period of 3.8 hours. It was named for Soviet cosmonaut Valentina Tereshkova. Orbit and classification According to a HCM-analysis by Nesvorný, Chaika is a non-family asteroid from the main belt's background population, while for Milani and Knežević, it is a member of the larger Astraea family, named after 5 Astraea. The Astraea family is not recognized by Nesvorný as a collisional asteroid family, who rather considers it an artifact in the model due to a resonant alignment. It orbits the Sun in the central asteroid belt at a distance of 1.9–3.3 AU once every 4 years and 2 months (1,520 days; semi-major axis of 2.59 AU). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic. The asteroid was first observed at the Lowell Observatory in April 1907. The body's observation arc begins at the Tokyo Observatory in November 1930, almost 4 years prior to