Astronomy:161989 Cacus

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Short description: Near-Earth asteroid in 1941/2022
161989 Cacus
161989-asteroid shape model (161989) Cacus.png
Shape model of Cacus from its lightcurve
Discovery[1][2]
Discovered byH.-E. Schuster
Discovery siteLa Silla Obs.
Discovery date8 February 1978
Designations
(161989) Cacus
Named afterCacus (Roman mythology)[2]
1978 CA
Minor planet categoryApollo · NEO · PHA[1]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc38.59 yr (14,096 days)
|{{{apsis}}}|helion}}1.3634 AU
|{{{apsis}}}|helion}}0.8828 AU
1.1231 AU
Eccentricity0.2140
Orbital period1.19 yr (435 days)
Mean anomaly345.40°
Mean motion0° 49m 41.16s / day
Inclination26.060°
Longitude of ascending node161.24°
102.16°
Earth MOID0.0152 AU · 5.9 LD
Physical characteristics
Mean diameter0.64±0.02 km[3]
1.126±0.073 km[4]
1.86 km[5]
1.9 km[6]
Rotation period3.7538±0.0019 h[6]
3.756 h[7]
3.761 h[5]
3.77±0.11 h[8]
Geometric albedo0.09[6]
0.119 (derived)[6]
0.199±0.052[4]
0.46±0.09[3]
Tholen = S[1][6] · Q[9]
B–V = 0.910[1]
U–B = 0.484[1]
Absolute magnitude (H)16.58[6][7] · 17.1[4] · 17.2[1] · 17.32[5] · 17.43[3]


161989 Cacus (prov. 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] Its orbit is confined between Venus and Mars.

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]

Close approaches[1]
Date JPL SBDB
nominal geocentric
distance 		uncertainty
region
(3-sigma)
1941-09-02 2418754 km ± 6 km
2022-09-01 8607710 km ± 21 km[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "JPL Small-Body Database Browser: 161989 Cacus (1978 CA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2161989&view=OPC. Retrieved 13 January 2018. 
  2. ↑ 2.0 2.1 2.2 2.3 "161989 Cacus (1978 CA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=161989. Retrieved 13 January 2018. 
  3. ↑ 3.0 3.1 3.2 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. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  4. ↑ 4.0 4.1 4.2 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  5. ↑ 5.0 5.1 5.2 Degewij, J.; Lebofsky, L.; Lebofsky, M. (March 1978). "1978 CA and 1978 DA". IAU Circ. 3193 (3193): 1. Bibcode: 1978IAUC.3193....1D. http://www.cbat.eps.harvard.edu/iauc/03100/03193.html#Item1. Retrieved 13 January 2018. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 "LCDB Data for (161989) Cacus". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=161989%7CCacus. Retrieved 13 January 2018. 
  7. ↑ 7.0 7.1 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 37: 483–486. Bibcode: 1979A&AS...37..483S. 
  8. ↑ 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. ISSN 1052-8091. Bibcode: 2014MPBu...41..286K. 
  9. ↑ 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". Icarus 228: 217–246. doi:10.1016/j.icarus.2013.10.004. Bibcode: 2014Icar..228..217T. 
  10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 13 January 2018. 
  11. ↑ "Horizons Batch for 2022-Sep-01 06:54 UT". JPL Horizons. https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Cacus%27&START_TIME=%272022-Sep-01%2006:54%27&STOP_TIME=%272022-Sep-02%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720,39%27. Retrieved 2022-01-17. 

External links



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