1089 Tama
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| Discovery | |
|---|---|
| Discovered by | Okuro Oikawa |
| Discovery date | November 17, 1927 |
| Designations | |
| Named after | Tama River |
| Alternative names |
A894 VA; A904 VD; A919 HA; 1927 WB; 1930 ST; 1952 HE4 |
| Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch November 26, 2005 (JD 2453700.5) | |
| Aphelion | 373.513 Gm (2.497 AU) |
| Perihelion | 288.749 Gm (1.930 AU) |
| Semi-major axis | 331.131 Gm (2.213 AU) |
| Eccentricity | 0.128 |
| Orbital period | 1202.846 d(3.29 a) |
| Average orbital speed | 19.94 km/s |
| Mean anomaly | 236.255° |
| Inclination | 3.730° |
| Longitude of ascending node | 71.565° |
| Argument of perihelion | 354.336° |
| Physical characteristics | |
| Dimensions | 13.44 ± 0.61[1] km |
| Mass | (8.90 ± 3.20) × 1014[1] kg |
| Mean density | 2.52 ± 0.29[1] g/cm3 |
| Equatorial surface gravity | 0.0036? m/s² |
| Escape velocity | 0.0068? km/s |
| Rotation period | 0.6852±0.0002 d |
| Albedo | 0.24 |
| Temperature | ~179 K |
| Spectral type | ? |
| Absolute magnitude (H) | 11.6 |
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1089 Tama is an asteroid orbiting the sun. It measures 12.9 km in diameter. It was discovered by Okuro Oikawa in 1927, and is named after the Tama River in Japan.[2]
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 W. Harris, Stefano Sposetti, Russell I. 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.[3]
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