1620 Geographos
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. The asteroid was named in honor of the National Geographic Society.
Lightcurve-based 3D-model of Geographos | |
| Discovery | |
|---|---|
| Discovered by | A. G. Wilson R. Minkowski |
| Discovery site | Palomar Observatory |
| Discovery date | 14 September 1951 |
| Designations | |
MPC designation | (1620) Geographos |
| Pronunciation | /dʒiːoʊˈɡræfɒs/ |
Named after | National Geographic Society |
Alternative designations | 1951 RA · 1983 CY3 |
Minor planet category | Apollo · NEO · PHA |
| Orbital characteristics | |
| 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 |
Semi-major axis | 1.2453 AU |
| Eccentricity | 0.3354 |
Orbital period (sidereal) | 1.39 yr (508 days) |
Mean anomaly | 246.00° |
Mean motion | 0° 42m 33.48s / day |
| Inclination | 13.337° |
Longitude of ascending node | 337.20° |
| 276.90° | |
| Earth MOID | 0.0301 AU · 11.7 LD |
| Physical characteristics | |
| Dimensions | (5.0×2.0×2.1) ± 0.15 km |
Mean diameter | 1.77±0.1 km 1.87±0.05 km 1.96±0.06 km 2.5 km 2.56±0.15 km |
Synodic rotation period | 5.2220±0.0003 h 5.22204±0.00007 h 5.22229±0.00004 h 5.223±0.003 h 5.223±0.005 h 5.223 h 5.223326 h 5.223327 h 5.223328 h 5.224±0.007 h |
| 0.26 0.290±0.038 0.29±0.04 0.32±0.04 0.3258±0.051 | |
| Tholen = S SMASS = S · S B–V = 0.862 B–V = 0.896±0.009 U–B = 0.471 V–R = 0.462±0.005 V–I = 0.816±0.006 | |
| 15.09 · 15.41 · 15.55±0.37 · 15.6 | |
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