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161989 Cacus

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161989 Cacus
Shape model ofCacusfrom itslightcurve
Discovery[1][2]
Discovered byH.-E. Schuster
Discovery siteLa Silla Obs.
Discovery date8 February 1978
Designations
(161989) Cacus
Named after
Cacus(Roman mythology)[2]
1978 CA
Apollo·NEO·PHA[1]
Orbital characteristics[1]
Epoch4 September 2017 (JD2458000.5)
Uncertainty parameter0
Observation arc38.59 yr (14,096 days)
Aphelion1.3634AU
Perihelion0.8828 AU
1.1231 AU
Eccentricity0.2140
1.19yr(435 days)
345.40°
0° 49m41.16s/ day
Inclination26.060°
161.24°
102.16°
EarthMOID0.0152 AU·5.9LD
Physical characteristics
0.64±0.02km[3]
1.126±0.073km[4]
1.86km[5]
1.9km[6]
3.7538±0.0019h[6]
3.756h[7]
3.761h[5]
3.77±0.11h[8]
0.09[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]
16.58[6][7]·17.1[4]·17.2[1]·17.32[5]·17.43[3]

161989 Cacus(prov. designation:1978 CA) is a stonyasteroid,classified asnear-Earth objectand apotentially hazardous asteroidof theApollo group,approximately 1 kilometer in diameter. It was discovered on 8 February 1978, by German astronomerHans-Emil SchusteratESO'sLa Silla Observatoryin northern Chile.[2]Its orbit is confined betweenVenusandMars.

Thisminor planetwas named from Roman mythology, afterCacus,a fire-breathing monster, which was killed byHercules.[2]The official naming citation was published by theMinor Planet Centeron 24 November 2007 (M.P.C.61270).[10]

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

References

[edit]
  1. ^abcdefgh"JPL Small-Body Database Browser: 161989 Cacus (1978 CA)"(2016-09-12 last obs.).Jet Propulsion Laboratory.Archivedfrom the original on 22 November 2020.Retrieved13 January2018.
  2. ^abcd"161989 Cacus (1978 CA)".Minor Planet Center.Retrieved13 January2018.
  3. ^abcNugent, 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.
  4. ^abcMainzer, 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.arXiv:1109.6407.Bibcode:2011ApJ...741...90M.doi:10.1088/0004-637X/741/2/90.S2CID35447010.
  5. ^abcDegewij, J.; Lebofsky, L.; Lebofsky, M. (March 1978)."1978 CA and 1978 DA".IAU Circ.3193(3193): 1.Bibcode:1978IAUC.3193....1D.Retrieved13 January2018.
  6. ^abcdef"LCDB Data for (161989) Cacus".Asteroid Lightcurve Database (LCDB).Retrieved13 January2018.
  7. ^abSchuster, 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.Bibcode:2014MPBu...41..286K.ISSN1052-8091.
  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.arXiv:1310.2000.Bibcode:2014Icar..228..217T.doi:10.1016/j.icarus.2013.10.004.
  10. ^"MPC/MPO/MPS Archive".Minor Planet Center.Retrieved13 January2018.
  11. ^"Horizons Batch for 2022-Sep-01 06:54 UT".JPL Horizons.Archivedfrom the original on 17 January 2022.Retrieved17 January2022.
[edit]
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