12564 Ikeller
| Discovery | |
|---|---|
| Discovered by | W. Bickel |
| Discovery site | Bergisch Gladbach Obs. |
| Discovery date | 22 September 1998 |
| Designations | |
| MPC designation | 12564 Ikeller |
|
Named after
|
Ingeborg Bickel–Keller (discoverer's wife) |
|
1998 SO49 · 1988 RA7 1991 EG5 · 1993 SK13 |
|
| main-belt · Koronis | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 26.84 yr (9,802 days) |
| Aphelion | 2.9414 AU |
| Perihelion | 2.7273 AU |
| 2.8343 AU | |
| Eccentricity | 0.0378 |
| 4.77 yr (1,743 days) | |
| 25.904° | |
| 0° 12m 23.76s / day | |
| Inclination | 1.6199° |
| 180.04° | |
| 117.75° | |
| Physical characteristics | |
| Dimensions | 5.17 km (calculated) 5.369±0.259 km |
|
7.0321±0.0196 h (R) 7.0423±0.0196 h (S) |
|
|
0.222±0.049 0.2225±0.0495 0.24 (assumed) |
|
| S | |
| 13.6 · 13.644±0.003 (R) · 14.16±0.23 · 14.282±0.007 (S) | |
12564 Ikeller, provisional designation 1998 SO49, is a stony Koronis asteroid from the outer region of the asteroid belt, approximately 5 kilometers in diameter. It was discovered by German amateur astronomer Wolf Bickel at his private Bergisch Gladbach Observatory on 22 September 1998.
The S-type asteroid is a member of the Koronis family, which is named after 158 Koronis and consists of about 300 known bodies. It orbits the Sun at a distance of 2.7–2.9 AU once every 4 years and 9 months (1,743 days). Its orbit has an eccentricity of 0.04 and a typically low inclination of 2° with respect to the ecliptic. The first precovery was obtained at ESO's La Silla Observatory in 1988, extending the asteroid's observation arc by 10 years prior to its discovery.
According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 5.4 kilometers in diameter and its surface has an albedo of 0.22, while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 and thus calculates a smaller diameter of 5.2 kilometers, as the higher the albedo (reflectivity), the smaller the body's diameter at a constant absolute magnitude (brightness). In August 2012, a photometric light-curve analysis at the U.S. Palomar Transient Factory, California, rendered a rotation period of 7.0423±0.0196 hours with a brightness amplitude of 0.44 in magnitude (U=2).
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