1657 Roemera
1657 Roemera, provisional designation 1961 EA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 6 March 1961, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and later named after American astronomer Elizabeth Roemer.
| Discovery | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 6 March 1961 |
| Designations | |
MPC designation | (1657) Roemera |
Named after | Elizabeth Roemer (American astronomer) |
Alternative designations | 1961 EA · 1932 AB |
Minor planet category | main-belt · (inner) Phocaea |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.79 yr (30,971 days) |
| Aphelion | 2.9032 AU |
| Perihelion | 1.7946 AU |
Semi-major axis | 2.3489 AU |
| Eccentricity | 0.2360 |
Orbital period (sidereal) | 3.60 yr (1,315 days) |
Mean anomaly | 253.33° |
| Inclination | 23.372° |
Longitude of ascending node | 105.32° |
| 54.409° | |
| Physical characteristics | |
| Dimensions | 7.665±0.219 km 8.04 km (calculated) |
Synodic rotation period | 4.5±1 h 34.0±0.1 h |
| 0.20 (assumed) 0.220±0.030 | |
| Tholen = S · S | |
| 12.84 · 12.89±0.16 | |
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