(9942) 1989 TM1
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|
| Discovery[1] | |
|---|---|
| Discovered by | T. Hioki N. Kawasato |
| Discovery site | Okutama Obs. (877) |
| Discovery date | 8 October 1989 |
| Designations | |
| MPC designation | (9942) 1989 TM1 |
| 1989 TM1 | |
| main-belt · (inner) [2] | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 9665 days (26.46 yr) |
| Aphelion | 3.0275 AU (452.91 Gm) |
| Perihelion | 2.1677 AU (324.28 Gm) |
| 2.5976 AU (388.60 Gm) | |
| Eccentricity | 0.16551 |
| 4.19 yr (1529.2 d) | |
| 76.602° | |
| Inclination | 9.9346° |
| 21.760° | |
| 38.545° | |
| Earth MOID | 1.18766 AU (177.671 Gm) |
| Jupiter MOID | 2.38644 AU (357.006 Gm) |
| Physical characteristics | |
| Dimensions | 4.73 km (calculated)[2] |
| 3.0706±0.0004 h[3] | |
| 0.20 (assumed)[2] | |
| S [2] | |
| 13.6[1] 13.99[2] 13.541[3] |
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(9942) 1989 TM1 is an unnamed, stony asteroid from the inner regions of the asteroid belt, roughly 5 kilometers in diameter. It was discovered by Japanese astronomers Nobuhiro Kawasato and Tsutomu Hioki at Okutama Observatory (877), Japan, on 8 October 1989.[4]
The stony S-type asteroid orbits the Sun at a distance of 2.2–3.0 AU once every 4 years and 2 months (1,528 days). Its orbit shows an eccentricity of 0.17 and an inclination of 10 degrees from the plane of the ecliptic.[1]
In 2012, a photometric light-curve analysis at the U.S. Palomar Transient Factory, California, rendered a tentative rotation period of 3.0706±0.0004 hours with a brightness amplitude of 0.08 in magnitude.[3]
The asteroid was predicted to cross the focal plane array of the Infrared Astronomical Satellite (IRAS). However, it was missed on each of its seven planned observation and was never detected. According to the "missed predictions file" of the supplemental IRAS minor planet survey (SIMPS), the body was expected to have a diameter of 13.5 kilometers and an absolute magnitude of 13.20.[5] Based on an absolute magnitude of 13.99, and on an assumed albedo of 0.20 – which is typical for asteroids with a stony surface composition – the Collaborative Asteroid Lightcurve Link (CALL) calculated a much smaller diameter of 4.7 kilometers.[2]
References
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<references />, or <references group="..." />External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- (9942) 1989 TM1 at the JPL Small-Body Database
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