1089 Tama

1089 Tama

A three-dimensional model of 1089 Tama based on its light curve.
Discovery
Discovered by Okuro Oikawa
Discovery date 17 November 1927
Designations
Named after
 Tama River
A894 VA; A904 VD;
A919 HA; 1927 WB;
1930 ST; 1952 HE4
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 120.83 yr (44133 days)
Aphelion 2.49560 AU (373.336 Gm)
Perihelion 1.93251 AU (289.099 Gm)
2.21405 AU (331.217 Gm)
Eccentricity 0.12716
3.29 yr (1203.3 d)
19.94 km/s
323.190°
0° 17m 57.019s / day
Inclination 3.72631°
71.4910°
354.252°
Earth MOID 0.944542 AU (141.3015 Gm)
Jupiter MOID 2.77088 AU (414.518 Gm)
Jupiter Tisserand parameter 3.641
Physical characteristics
Mean radius
 6.46±0.3 km[1]
6.72 ± 0.31 km[2]
Mass (8.90 ± 3.20) × 1014 kg[2]
Mean density
 2.52 ± 0.29[2] g/cm3
Equatorial surface gravity
 0.0036? m/s²
Equatorial escape velocity
 0.0068? km/s
16.44 h (0.685 d)
0.2424±0.023
Temperature ~179 K
?
11.7

    1089 Tama is a main-belt asteroid that measures ~13 km in diameter. It was discovered by Japanese astronomer Okuro Oikawa in 1927, and is named after the Tama River in Japan.[3]

    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 Harris, Stefano Sposetti, Russell 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.[4]

    References

    1. 1 2 "1089 Tama (1927 WB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
    2. 1 2 3 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
    3. ↑ Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), p.93.
    4. ↑

    External links


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