161989 Cacus

Near-Earth asteroid in 1941/2022 October 2019 yes 161989 Cacus #FFC2E0 161989-asteroid shape model (161989) Cacus.png Shape model of Cacus from its lightcurve H.-E. Schuster La Silla Obs. 8 February 1978 (161989) Cacus 1978 CA ' k eI k @ s Cacus (Roman mythology) ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 38.59 yr (14,096 days) 1.3634 AU 0.8828 AU 1.1231 AU 0.2140 1.19 yr (435 days) 345.40° 0.8281 ms / day 26.060° 161.24° 102.16° 0.0152 AU5.9 LD 0.64 0.02 km1.126 0.073 km1.86 km1.9 km 3.7538 0.0019 h3.756 h3.761 h3.77 0.11 h 0.090.119 (derived)0.199 0.0520.46 0.09 Tholen SQB–V 0.910U–B 0.484 16.5817.117.217.3217.43 161989 Cacus (provisional designation: 1978 CA) is a stony asteroid, classified as a 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. 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. The official naming citation was published by the Minor Planet Center on 24 November 2007 (M.P.C. 61270). +Close approaches Date JPL SBDBnominal geocentricdistance uncertaintyregion(3-sigma)1941-09-02 2418754 km ± 6 km2022-09-01 8607710 km ± 21 km References 30em 2016-09-12 last obs. JPL Small-Body Database Browser: 161989 Cacus (1978 CA) https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2161989&view=OPC https://web.archive.org/web/20201122210719/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2161989 live 22 November 2020 Jet Propulsion Laboratory 13 January 2018 161989 Cacus (1978 CA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=161989 13 January 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 13 January 2018 161989 13 January 2018 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 35447010 6 C. R. Nugent A. Mainzer J. Bauer R. M. Cutri E. A. Kramer T. Grav J. Masiero S. Sonnett E. L. Wright September 2016 NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos The Astronomical Journal 152 3 12 2016AJ....152...63N 10.3847/0004-6256/152/3/63 1606.08923 free J. Degewij L. Lebofsky M. Lebofsky March 1978 1978 CA and 1978 DA http://www.cbat.eps.harvard.edu/iauc/03100/03193.html#Item1 IAU Circ. 3193 1 1978IAUC.3193....1D 13 January 2018 6 Bruce W. Koehn Edward G. Bowell Brian A. Skiff Jason J. Sanborn Kyle P. McLelland Petr Pravec Brian D. Warner October 2014 Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS) - 2009 January through 2009 June The Minor Planet Bulletin 41 4 286–300 1052-8091 2014MPBu...41..286K H. E. Schuster A. Surdej J. Surdej September 1979 Photoelectric observations of two unusual asteroids - 1978 CA and 1978 DA Astronomy and Astrophysics Supplement Series 37 483–486 1979A&AS...37..483S Cristina A. Thomas Joshua P. Emery David E. Trilling Marco Delbó Joseph L. Hora Michael Mueller January 2014 Physical characterization of Warm Spitzer-observed near-Earth objects Icarus 228 217–246 2014Icar..228..217T 10.1016/j.icarus.2013.10.004 1310.2000 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 https://web.archive.org/web/20220117020609/https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27Cacus%27&START_TIME=%272022-Sep-01+06%3A54%27&STOP_TIME=%272022-Sep-02%27&STEP_SIZE=%271+day%27&QUANTITIES=%2720%2C39%27 2022-01-17 live 2022-01-17 External links Lightcurve Database Query (LCDB), at www.minorplanet.info Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Geneva Observatory, Raoul Behrend 161989 161989 Cacus 161989 161989 Category:Discoveries by Hans-Emil Schuster Category:Named minor planets 161989 161989 19780208