1089 Tama
.png) 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) | |
Average orbital speed | 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) |
| TJupiter | 3.641 |
| Physical characteristics | |
| 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
- ^ a b "1089 Tama (1927 WB)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
- ^ a b c Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009. See Table 1.
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), p.93.
- ^ * IAUC 8265 Archived March 3, 2016, at the Wayback Machine
External links
- Discovery Circumstances: Numbered Minor Planets
- Johnston Archive entry for 1089 Tama
- IAUC 8265
- 1089 Tama at the JPL Small-Body Database
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