(9942) 1989 TM1
 | |
| Discovery [1] | |
|---|---|
| Discovered by | T. Hioki N. Kawasato |
| Discovery site | Okutama Obs. (877) |
| Discovery date | 8 October 1989 |
| Designations | |
| (9942) 1989 TM1 | |
| 1989 TM1 | |
| main-belt · (inner) [2] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.21 yr (9,575 days) |
| Aphelion | 3.0251 AU |
| Perihelion | 2.1674 AU |
| 2.5962 AU | |
| Eccentricity | 0.1651 |
| 4.18 yr (1,528 days) | |
| 29.635° | |
| Inclination | 9.9335° |
| 21.775° | |
| 38.408° | |
| Physical characteristics | |
| Dimensions | 4.73 km (calculated)[2] |
| 3.0706±0.0004 h[3] | |
| 0.20 (assumed)[2] | |
| S [2] | |
| 13.5[1] 13.99[2] 13.541[3] | |
(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
- ^ a b c d "JPL Small-Body Database Browser: 9942 (1989 TM1)" (2015-12-18 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c d e f "LCDB Data for (9942)". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved January 2016.
{{cite journal}}: Check date values in:|access-date=(help) - ^ "9942 (1989 TM1)". Minor Planet Center. Retrieved January 2016.
{{cite web}}: Check date values in:|accessdate=(help) - ^ Tedesco E.F.; Noah P.V.; Noah M.; Price S.D. "The supplemental IRAS minor planet survey (SIMPS) – Missed-Predictions". Retrieved January 2016.
{{cite web}}: Check date values in:|access-date=(help)
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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