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161989 Cacus (1978 CA)
Classification: Apollo [NEO, PHA]          SPK-ID: 2161989
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 172 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2140097254062911 7.1874e-08  
a 1.123117228310595 2.3975e-09 au
q .8827592186807698 7.975e-08 au
i 26.0598473365478 1.033e-05 deg
node 161.2361828524354 6.2983e-06 deg
peri 102.175880685652 1.5809e-05 deg
M 122.2272578898243 1.9083e-05 deg
tp 2458452.894809822174
(2018-Nov-30.39480982)
2.2702e-05 TDB
period 434.7464663889932
1.19
1.3921e-06
3.811e-09
d
yr
n .8280688351308804 2.6515e-09 deg/d
Q 1.36347523794042 2.9106e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1073  
   data-arc span      14096 days (38.59 yr)  
   first obs. used      1978-02-08  
   last obs. used      2016-09-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37888  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-15 07:29:05  

Additional Information
 Earth MOID = .0148158 au 
 Jupiter MOID = 3.81215 au 
 T_jup = 5.448 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.2   n/a MPO366964  
diameter diameter 1.9 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 3.7538 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Degewij, J. (1978) Messenger 13, 5; IAUC 3193.]
[Schuster, H.E.; Surdej, A.; Surdej, J. (1979) Astron. Astrophys. Suppl. Ser. 37, 483-486.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2003) http://www.asu.cas.cz/~ppravec/neo.htm]
[Koehn, B.W.; Bowell, E.L.G.; Skiff, B.A.; Sanborn, J.J.; et al. (2014) Minor Planet Bull. 41, 286-300.]
[Durech, J.; Vokrouhlicky, D.; Pravec, P.; Hanus, J.; et al. (2018) Astron. Astrophys. 609, A86.]
geometric albedo albedo 0.09   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV 0.910   0.017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=8.42, mean=14.40, max.=26.34) deg.
U-B UB 0.484   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=8.42, mean=14.40, max.=26.34) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

161989 Cacus           Discovered 1978 Feb. 8 by H.-E. Schuster at the European Southern Observatory.
The fire-breathing monster Cacus, son of Vulcan, stole cattle Hercules had acquired as his tenth labor. Although Cacus tried to make it appear that the cattle had gone in the opposite direction, Hercules found them and strangled Cacus, erecting an altar at the spot that later became the Forum Boarium, the Rome cattle market.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20071124/MPCPages.arcLast Updated: 2007-11-26

[ show close-approach data ]
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