1657 Roemera
| Discovery | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 6 March 1961 |
| Designations | |
| MPC designation | 1657 Roemera |
|
Named after
|
Elizabeth Roemer (astronomer) |
| 1961 EA · 1932 AB | |
| main-belt · (inner) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.58 yr (30,893 days) |
| Aphelion | 2.9033 AU |
| Perihelion | 1.7943 AU |
| 2.3488 AU | |
| Eccentricity | 0.2361 |
| 3.60 yr (1,315 days) | |
| 198.59° | |
| Inclination | 23.373° |
| 105.33° | |
| 54.396° | |
| Physical characteristics | |
| Dimensions |
7.665±0.219 km 8.04 km (calculated) |
|
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 | |
1657 Roemera, provisional designation 1961 EA, is a stony 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.
Roemera is a stony S-type asteroid. It orbits the Sun at a distance of 1.8–2.9 AU once every 3 years and 7 months (1,315 days). Its orbit has an eccentricity of 0.24 and an inclination of 23° with respect to the ecliptic.Roemera was first identified as 1932 AB at Heidelberg Observatory in 1932, extending the body's observation arc by 29 years prior to its official discovery observation.
In May 2008, American astronomer Brian D. Warner obtained a rotational light-curve of Roemera from photometric observations at his Palmer Divide Observatory in Colorado. It gave a longer than average rotation period of 34.0 hours with a brightness variation of 0.15 magnitude (U=2). Polish astronomer Wiesław Z. Wiśniewski found a different period solution of 4.5 hours with a low amplitude of 0.09 magnitude in March 1990 (U=2).
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