161989 Cacus
Discovery [1][2] | |
---|---|
Discovered by | H.-E. Schuster |
Discovery site | La Silla Obs. |
Discovery date | 8 February 1978 |
Designations | |
MPC designation | (161989) Cacus |
Named after | Cacus (Roman mythology) [2] |
1978 CA | |
Apollo · NEO · PHA [1] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 38.59 yr (14,096 days) |
Aphelion | 1.3634 AU |
Perihelion | 0.8828 AU |
1.1231 AU | |
Eccentricity | 0.2140 |
1.19 yr (435 days) | |
345.40° | |
0° 49m 41.16s / day | |
Inclination | 26.060° |
161.24° | |
102.16° | |
Earth MOID | 0.0152 AU · 5.9 LD |
Physical characteristics | |
Mean diameter |
±0.02 km 0.64[3] ±0.073 km 1.126[4] km 1.86[5] km 1.9[6] |
±0.0019 h 3.7538[6] h 3.756[7] h 3.761[5] ±0.11 3.77h[8] | |
0.09[6] 0.119 (derived)[6] ±0.052 0.199[4] ±0.09 0.46[3] | |
Tholen = S [1][6] · Q [9] B–V = 0.910[1] U–B = 0.484[1] | |
16.58[6][7] · 17.1[4] · 17.2[1] · 17.32[5] · 17.43[3] | |
|
161989 Cacus, provisional designation 1978 CA, is a stony asteroid, classified as near-Earth object and a potentially hazardous asteroid of the Apollo group, approximately 1 kilometer in diameter. It was discovered on 8 February 1978, by German astronomer Hans-Emil Schuster at ESO's La Silla Observatory in northern Chile.[2]
This minor planet was named from Roman mythology, after Cacus, a fire-breathing monster, which was killed by Hercules.[2] The official naming citation was published by the Minor Planet Center on 24 November 2007 (M.P.C. 61270).[10]
References
- 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 161989 Cacus (1978 CA)" (2016-09-12 last obs.). Jet Propulsion Laboratory. Retrieved 13 January 2018.
- 1 2 3 4 "161989 Cacus (1978 CA)". Minor Planet Center. Retrieved 13 January 2018.
- 1 2 3 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal. 152 (3): 12. arXiv:1606.08923. Bibcode:2016AJ....152...63N. doi:10.3847/0004-6256/152/3/63. Retrieved 13 January 2018.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 13 January 2018.
- 1 2 3 Degewij, J.; Lebofsky, L.; Lebofsky, M. (March 1978). "1978 CA and 1978 DA". IAU Circ. (3193). Bibcode:1978IAUC.3193....1D. Retrieved 13 January 2018.
- 1 2 3 4 5 6 "LCDB Data for (161989) Cacus". Asteroid Lightcurve Database (LCDB). Retrieved 13 January 2018.
- 1 2 Schuster, H. E.; Surdej, A.; Surdej, J. (September 1979). "Photoelectric observations of two unusual asteroids - 1978 CA and 1978 DA". Astronomy and Astrophysics Supplement Series: 483–486. Bibcode:1979A&AS...37..483S. Retrieved 13 January 2018.
- ↑ Koehn, Bruce W.; Bowell, Edward G.; Skiff, Brian A.; Sanborn, Jason J.; McLelland, Kyle P.; Pravec, Petr; et al. (October 2014). "Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2009 January through 2009 June". The Minor Planet Bulletin. 41 (4): 286–300. Bibcode:2014MPBu...41..286K. ISSN 1052-8091. Retrieved 13 January 2018.
- ↑ Thomas, Cristina A.; Emery, Joshua P.; Trilling, David E.; Delbó, Marco; Hora, Joseph L.; Mueller, Michael (January 2014). "Physical characterization of Warm Spitzer-observed near-Earth objects" (PDF). Icarus. 228: 217–246. arXiv:1310.2000. Bibcode:2014Icar..228..217T. doi:10.1016/j.icarus.2013.10.004. Retrieved 13 January 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 January 2018.
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 (160001)-(165000) – Minor Planet Center
- 161989 Cacus at the JPL Small-Body Database
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