1089 Tama
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Discovery
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| Discovered by | Okuro Oikawa |
| Discovery date | November 17, 1927 |
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Designations
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| Named after | Tama River |
| Alternate name(s) | A894 VA; A904 VD; A919 HA; 1927 WB; 1930 ST; 1952 HE4 |
| Minor planet category |
Main belt |
| 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° |
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Physical characteristics
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| Dimensions | 12.9 km |
| Mass | 2.2×1015? kg |
| Mean density | 2.0? 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 |
1089 Tama is an asteroid orbiting the sun. It measures 12.9km in diameter. It was discovered by Okuro Oikawa in 1927, and is named after the Tama River in Japan.[1]
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.[2]
[edit] References
[edit] External links
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