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1620 Geographos
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1620 Geographos (/dʒiːoʊˈɡræfɒs/; provisional designation 1951 RA) is a highly elongated, stony asteroid, near-Earth object and potentially hazardous asteroid of the Apollo group, with a mean diameter of approximately 2.5 km (1.6 mi). It was discovered on 14 September 1951, by astronomers Albert George Wilson and Rudolph Minkowski at the Palomar Observatory in California, United States.[3] The asteroid was named in honor of the National Geographic Society.[2]
Quick Facts Discovery, Discovered by ...
![]() Lightcurve-based 3D-model of Geographos | |
Discovery[1] | |
---|---|
Discovered by | A. G. Wilson R. Minkowski |
Discovery site | Palomar Observatory |
Discovery date | 14 September 1951 |
Designations | |
(1620) Geographos | |
Pronunciation | /dʒiːoʊˈɡræfɒs/ |
Named after | National Geographic Society[2] |
1951 RA · 1983 CY3 | |
Apollo · NEO · PHA[1][3] | |
Orbital characteristics[1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 65.37 yr (23,875 days) |
Earliest precovery date | 31 August 1951 |
Aphelion | 1.6629 AU |
Perihelion | 0.8276 AU |
1.2453 AU | |
Eccentricity | 0.3354 |
1.39 yr (508 days) | |
246.00° | |
0° 42m 33.48s / day | |
Inclination | 13.337° |
337.20° | |
276.90° | |
Earth MOID | 0.0301 AU · 11.7 LD |
Physical characteristics | |
Dimensions | (5.0×2.0×2.1) ± 0.15 km[4] |
1.77±0.1 km[5] 1.87±0.05 km[6] 1.96±0.06 km[7] 2.5 km[8][9] 2.56±0.15 km[4] | |
5.2220±0.0003 h[10] 5.22204±0.00007 h[lower-alpha 1] 5.22229±0.00004 h[11] 5.223±0.003 h[12] 5.223±0.005 h[13] 5.223 h[14] 5.223326 h[15][16] 5.223327 h[4] 5.223328 h[17][18] 5.224±0.007 h[19] | |
0.26[8][9] 0.290±0.038[6] 0.29±0.04[6] 0.32±0.04[7] 0.3258±0.051[5] | |
Tholen = S[1] SMASS = S[1][8] · S[20] B–V = 0.862[1] B–V = 0.896±0.009[20] U–B = 0.471[1] V–R = 0.462±0.005[20] V–I = 0.816±0.006[20] | |
15.09[8][9] · 15.41[7] · 15.55±0.37[21] · 15.6[1][5][6] | |
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