1620 Geographos (1951 RA) |
Classification: Apollo [NEO, PHA] SPK-ID: 2001620 |
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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 578 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .335440517555168 | 1.1409e-08 | |
a | 1.245302338473132 | 3.3473e-10 | au |
q | .8275774775430433 | 1.4335e-08 | au |
i | 13.3373479025563 | 2.6128e-06 | deg |
node | 337.1954004301368 | 2.6564e-06 | deg |
peri | 276.9150346416803 | 3.5457e-06 | deg |
M | 311.5329672147489 | 3.1143e-06 | deg |
tp | 2458668.836788314721 (2019-Jul-04.33678831) | 4.4179e-06 | TDB |
period | 507.5871655338067 1.39 | 2.0466e-07 5.603e-10 | d yr |
n | .7092377909543952 | 2.8596e-10 | deg/d |
Q | 1.66302719940322 | 4.4702e-10 | au |
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| | Orbit Determination Parameters
Additional Information
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Physical Parameter Table
Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
absolute magnitude |
H |
15.60 |
|
n/a |
IRAS-A-FPA-3-RDR-IMPS-V6.0 |
IRAS observations used: 2 |
diameter |
diameter |
2.56 |
km |
0.15 |
Hudson & Ostro, Icarus 193 (2008) 20-38 |
|
extent |
extent |
5.0x2.0x2.1 |
km |
0.15 |
Hudson & Ostro, Icarus 193 (2008) 20-38 |
|
rotation period |
rot_per |
5.22204 |
h |
n/a |
LCDB (Rev. 2019-January); Warner et al., 2009 |
Published Reference List: [Dunlap, J.L. (1974) Astron. J. 79, 324-332.] [Michalowski, T.; Kwiatkowski, T.; Borczyk, W.; Pych, W. (1994) Acta Astronomica 44, 223-226.] [Kwiatkowski, T. (1995) Astron. Astrophys. 294, 274-277.] [Magnusson, P.; Dahlgren, M.; Barucci, M.A.; Jorda, L.; et al. (1996) Icarus 123, 227-244.] [Hudson, R.S.; Ostro, S.J. (1999) Icarus 140, 369-378.] [Kaasalainen, M.; Torppa, J.; Muinonen, K. (2001) Icarus 153, 37-51.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Higgins, D.; Pravec, P.; Kusnirak, P.; Hornoch, K.; Brinsfield, J.W.; Allen, B.; Warner, B.D. (2008) Minor Planet Bull. 35, 123-126.] [Polishook, D. (2009) Minor Planet Bull. 36, 119-120.] [Hamanowa, H.; Hamanowa, H. (2011) http://www2.ocn.ne.jp/~hamaten/astlcdata.htm] [Skiff, B.A.; Bowell, E.; Koehn, B.W.; Sanborn, J.J.; McLelland, K.P.; Warner, B.D. (2012) Minor Planet Bull. 39, 111-130.] [Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2016) Minor Planet Bull. 43, 143-154.] [Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 43-3, in progress. (NEA Gaggle)http://www.planetarysciences.org/lightcurves.html] |
geometric albedo |
albedo |
0.290 |
|
0.038 |
urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N) |
|
B-V |
BV |
0.862 |
|
0.034 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#obs=7; phase (min.=17.27, mean=33.74, max.=52.91) deg. |
U-B |
UB |
0.471 |
|
0.053 |
EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 |
#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 |
Reference: DISCOVERY.DB | Last Updated: 2003-08-29 |
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