1620 Geographos

1620 Geographos
Lightcurve-based 3D-model of Geographos
Discovery[1]
Discovered byA. G. Wilson
R. Minkowski
Discovery sitePalomar Observatory
Discovery date14 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 arc65.37 yr (23,875 days)
Earliest precovery date31 August 1951
Aphelion1.6629 AU
Perihelion0.8276 AU
1.2453 AU
Eccentricity0.3354
1.39 yr (508 days)
246.00°
0° 42m 33.48s / day
Inclination13.337°
337.20°
276.90°
Earth MOID0.0301 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[a]
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]

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]

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