| 1620 Geographos (1951 RA) |
| Classification: Apollo [NEO, PHA] SPK-ID: 2001620 |
[ 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 2454800.5 (2008-Nov-30.0) TDB
Reference: JPL 186 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .3355106763593981 | 1.1335e-08 | |
| a | 1.245550856150932 | 5.9022e-10 | AU |
| q | .8276552459637058 | 1.4337e-08 | AU |
| i | 13.33769433331871 | 3.8859e-06 | deg |
| node | 337.26601696 | 2.804e-06 | deg |
| peri | 276.8065391182392 | 3.8448e-06 | deg |
| M | 136.9500302272272 | 3.7077e-06 | deg |
| tp | 2454607.347534790015
(2008-May-20.84753480) | 5.0965e-06 | JED |
| period | 507.7391174008675
1.39 | 3.609e-07
9.881e-10 | d
yr |
| n | .7090255362691993 | 5.0397e-10 | deg/d |
| Q | 1.663446466338159 | 7.8824e-10 | AU |
|
| | 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 |
15.60 |
mag |
n/a |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 2 |
| diameter |
diameter |
2 |
km |
n/a |
Effective diameter for axes: 1.5x4.0 km radar |
Yeomans E-mail 2001-Apr-04 |
| extent |
extent |
5.11x1.85 |
km |
0.11 |
Ostro, S.J. et al. (1996) Icarus v.121, pp.46-66 |
based on 2D radar imaging, page 55 |
| rotation period |
rot_per |
5.223 |
h |
n/a |
IAU Lightcurve Data
(A.W. Harris, E-mail Mar. 2006) |
Published Reference List:
[Dunlap, J.L.: 1974, Astron. J. 79, 324-332.]
[Weidenschilling, S.J., Chapman, C.R., Davis, D.R., Greenberg, R., Levy, D.H., Binzel, R.P., Vail, S.M., Magee, M., Spaute, D.: 1990, Icarus 86, 402-447.]
[Michalowski, T., Kwiatkowski, T., Borczyk, W., Pych, W.: 1994, Acta Astronomica 44, 223-226.]
[Hicks, M., Grundy, W., Fink, U., Mottola, S., Neukum, G.: 1995, Icarus 113, 456-459.]
[Kwiatkowski, T.: 1995, Astron. Astrophys. 294, 274-277.] |
| geometric albedo |
albedo |
0.3258 |
|
0.051 |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 2 |
| B-V |
BV |
.862 |
mag |
.034 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 |
#obs=7; phase (min.=17.27, mean=33.74, max.=52.91) deg. |
| U-B |
UB |
.471 |
mag |
.053 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.1 |
#obs=4; phase (min.=36.47, mean=37.14, max.=37.75) deg. |
| Tholen spectral type |
spec_T |
S |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
used 4 color indices; used ground-based radiometric albedo |
| SMASSII spectral type |
spec_B |
S |
|
n/a |
EAR-A-5-DDR-TAXONOMY-V4.0 |
based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) |
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| 1620 Geographos (1951 RA) | Discovered 1951-Sep-14 by Wilson, A. G. and Minkowski, R. at Palomar (675) |
| Reference: DISCOVERY.DB | Last Updated: 2003--0-8- |
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