1089 Tama
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| Discovery A | |
|---|---|
| Discoverer | Okuro Oikawa |
| Discovery date | November 17, 1927 |
| Alternate designations B |
A894 VA; A904 VD; A919 HA; 1927 WB; 1930 ST; 1952 HE4 |
| Category | Main belt |
| Orbital elements C | |
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| Eccentricity (e) | 0.128 |
| Semi-major axis (a) | 331.131 Gm (2.213 AU) |
| Perihelion (q) | 288.749 Gm (1.930 AU) |
| Aphelion (Q) | 373.513 Gm (2.497 AU) |
| Orbital period (P) | 1202.846 d (3.29 a) |
| Mean orbital speed | 19.94 km/s |
| Inclination (i) | 3.730° |
| Longitude of the ascending node (Ω) |
71.565° |
| Argument of perihelion (ω) |
354.336° |
| Mean anomaly (M) | 236.255° |
| Physical characteristics D | |
| Dimensions | 12.9 km |
| Mass | 2.2×1015? kg |
| Density | 2.0? g/cm³ |
| Surface gravity | 0.0036? m/s² |
| Escape velocity | 0.0068? km/s |
| Rotation period | 0.6852±0.0002 d |
| Spectral class | ? |
| Absolute magnitude | 11.6 |
| Albedo (geometric) | 0.24 |
| Mean surface temperature |
~179 K |
1089 Tama is an asteroid orbiting the Sun. It is named after the Tama River in Japan.
A satellite, designated S/2003 (1089) 1, 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 W. Harris, Stefano Sposetti, Russell I. Durkee, and Alain Klotz. This was announced on 12 January 2004. The moon, about 9 km in diameter, orbits 20 km away in 0.6852±0.0002 d (synchronously) and may actually be in contact with its primary.
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