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

[ show orbit diagram ]
Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 128 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2140124846329111 5.1359e-08  
a 1.123047575363607 3.8944e-09 AU
q .882701373399075 5.7199e-08 AU
i 26.06052028798 1.1632e-05 deg
node 161.2490269739899 5.2499e-06 deg
peri 102.1581600913657 1.7397e-05 deg
M 71.63496486033632 1.2794e-05 deg
tp 2456713.999581205875
(2014-Feb-25.49958121)
1.5192e-05 JED
period 434.7060241684735
1.19
2.2611e-06
6.191e-09
d
yr
n .8281458732683202 4.3076e-09 deg/d
Q 1.363393777328139 4.7278e-09 AU
  Orbit Determination Parameters
   # obs. used (total)      985  
   data-arc span      11811 days (32.34 yr)  
   first obs. used      1978-02-08  
   last obs. used      2010-06-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54325  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-11 10:54:50  

Additional Information
 Earth MOID = .0144751 AU 
 T_jup = 5.449 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.1 mag n/a MPO220424  
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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) 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]
geometric albedo albedo 0.09   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV .910 mag .017 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #obs=3; phase (min.=8.42, mean=14.40, max.=26.34) deg.
U-B UB .484 mag .020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 #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 ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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