2100 Ra-Shalom
2100 Ra-Shalom (prov. designation: 1978 RA) is an asteroid and near-Earth object of the Aten group on an eccentric orbit in the inner Solar System. It was discovered on 10 September 1978, by American astronomer Eleanor Helin at the Palomar Observatory, California, who named it in commemoration of the Camp David Peace Accords. The C-type asteroid (Xc, K) has a rotation period of 19.8 hours and measures approximately 2.7 kilometers (1.7 miles) in diameter.
Shape model of Ra-Shalom from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | E. F. Helin |
| Discovery site | Palomar Obs. |
| Discovery date | 10 September 1978 |
| Designations | |
MPC designation | (2100) Ra-Shalom |
| Pronunciation | /ˌrɑː ʃəˈloʊm/ |
Named after | Ra and Shalom (composed name) |
Alternative designations | 1978 RA · 1975 TB |
Minor planet category | NEO · Aten |
| Orbital characteristics | |
| Epoch 7 November 2005 (JD 2453681.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.07 yr (14,999 days) |
| Aphelion | 1.1952 AU |
| Perihelion | 0.4688 AU |
Semi-major axis | 0.8320 AU |
| Eccentricity | 0.4365 |
Orbital period (sidereal) | 0.76 yr (277 days) |
Mean anomaly | 104.56° |
| Inclination | 15.756° |
Longitude of ascending node | 170.88° |
| 355.98° | |
| Earth MOID | 0.1496 AU · 58.3 LD |
| Physical characteristics | |
Mean diameter | 1.98±0.05 km 2.04 km 2.22 km 2.24 km 2.3±0.2 km 2.48 km 2.78 km 2.79 km |
Synodic rotation period | 19.79±0.03 h 19.793±0.001 h 19.797 h 19.79981 h 19.8201±0.00004 h 19.89±0.05 |
| 0.080 0.082 0.125 0.13±0.03 0.14±0.10 0.16 0.177±0.009 | |
| C (Tholen) · Xc (SMASS) C (CALL) · K B–V = 0.712 U–B = 0.310 | |
| 15.66±0.1 (R) · 15.90 · 16.05 · 16.054±0.07 · 16.06±0.07 · 16.06 · 16.07 · 16.1 · 16.11 | |
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