|Discovered by Okuro Oikawa|
Minor planet category Main belt
Discovered 17 November 1927
Discoverer Okuro Oikawa
Asteroid family Flora family
|Discovery date 17 November 1927|
Observation arc 120.83 yr (44133 days)
Named after Tama River
Moon S/2003 (1089) 1
|Alternative names A894 VA; A904 VD;
A919 HA; 1927 WB;
1930 ST; 1952 HE4|
Aphelion 2.49560 AU (373.336 Gm)
Similar Asteroid belt, 1338 Duponta, 283 Emma, Solar System, 1333 Cevenola
1089 Tama is a main-belt asteroid that measures ~13 km in diameter. It was discovered by Japanese astronomer Okuro Oikawa in 1927, and is named after the Tama River in Japan.
In 2004, it was announced that Tama has a moon, designated S/2003 (1089) 1. The satellite was identified based on lightcurve observations from 24 December 2003 to 5 January 2004 by Raoul Behrend, René Roy, Claudine Rinner, Pierre Antonini, Petr Pravec, Alan Harris, Stefano Sposetti, Russell Durkee, and Alain Klotz. The moon is about 9 km in diameter. It may orbits 20 km away in a period of 0.6852±0.0002 days (synchronously), and Tama itself appears to be somewhat elongated in shape.