1089 Tama

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1089 Tama
1089Tama (Lightcurve Inversion).png
A three-dimensional model of 1089 Tama based on its light curve.
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

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]

References[edit]

  1. ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73: 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009.  See Table 1.
  2. ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), p.93.
  3. ^ * IAUC 8265

External links[edit]