1089 Tama

1089 Tama
1089 Tama
Discovery
Discovered by Okuro Oikawa
Discovery date November 17, 1927
Designations
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°
Physical characteristics
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 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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