| 161989 Cacus (1978 CA) |
| Classification: Apollo [NEO, PHA] SPK-ID: 2161989 |
[ hide orbit diagram ]
| Orbit Diagram
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| Note:
Make sure you have Java enabled on your browser to see the applet.
This applet is provided as a 3D orbit visualization tool.
The applet was implemented using 2-body methods,
and hence should not be used for determining accurate long-term trajectories
(over several years or decades) or planetary encounter circumstances.
For accurate long-term ephemerides, please instead use our Horizons system. |
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Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.
Orbit Viewer applet originally written and kindly provided by
Osamu Ajiki (AstroArts),
and further modified by
Ron Baalke (JPL).
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Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB
Reference: JPL 126 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .2140055704707981 | 5.2918e-08 | |
| a | 1.123009178441121 | 3.988e-09 | AU |
| q | .8826789585648865 | 5.8433e-08 | AU |
| i | 26.05940928352616 | 1.257e-05 | deg |
| node | 161.2570713610976 | 4.7272e-06 | deg |
| peri | 102.1353748093941 | 1.75e-05 | deg |
| M | 100.3897045203935 | 1.237e-05 | deg |
| tp | 2456279.283968708111
(2012-Dec-17.78396871) | 1.4589e-05 | JED |
| period | 434.6837305036142
1.19 | 2.3155e-06
6.339e-09 | d
yr |
| n | .8281883464626398 | 4.4116e-09 | deg/d |
| Q | 1.363339398317355 | 4.8415e-09 | AU |
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| | Orbit Determination Parameters
Additional Information
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[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
17.108 |
mag |
.5631 |
126 |
autocmod 2.5c |
| 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-May-01) |
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 |
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| 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 |
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| 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.arc | Last Updated: 2007-11-26 |
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