| Discovery[1] | |
|---|---|
| Discovered by | W. Bickel |
| Discovery site | Bergisch Gladbach Obs. |
| Discovery date | 22 September 1998 |
| Designations | |
| (12564) Ikeller | |
Named after | Ingeborg Bickel–Keller (discoverer's wife)[2] |
| 1998 SO49 · 1988 RA7 1991 EG5 · 1993 SK13 | |
| main-belt · Koronis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 27.90 yr (10,190 days) |
| Aphelion | 2.9423AU |
| Perihelion | 2.7273 AU |
| 2.8348 AU | |
| Eccentricity | 0.0379 |
| 4.77yr (1,743 days) | |
| 67.076° | |
| 0° 12m 23.4s / day | |
| Inclination | 1.6200° |
| 180.04° | |
| 117.88° | |
| Physical characteristics | |
| Dimensions | 5.17 km(calculated)[3] 5.369±0.259 km[4][5] |
| 7.0321±0.0196h(R)[6] 7.0423±0.0196 h(S)[6] | |
| 0.222±0.049[5] 0.2225±0.0495[4] 0.24(assumed)[3] | |
| S[3] | |
| 13.6[1][3][4] · 13.644±0.003(R)[6] · 14.16±0.23[7] · 14.282±0.007(S)[6] | |
12564 Ikeller, provisional designation1998 SO49, is a stony Koronianasteroid from the outer region of theasteroid belt, approximately 5 kilometers in diameter.
The asteroid was discovered by German amateur astronomerWolf Bickel at his privateBergisch Gladbach Observatory on 22 September 1998. It was named after the discoverer's wife, Ingeborg Bickel–Keller.[2]
Ikeller is a member of theKoronis family, a group ofstony asteroids in theouter main-belt named after158 Koronis. 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 aneccentricity of 0.04 and aninclination of 2° with respect to theecliptic.[1]
The body'sobservation arc begins 10 years prior to its official discovery observation, with its identification as1988 RA7 at ESO'sLa Silla Observatory in September 1988.[2]
According to the survey carried out by theNEOWISE mission of NASA's space-basedWide-field Infrared Survey Explorer,Ikeller measures 5.4 kilometers in diameter and its surface has analbedo of 0.22,[4] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for Koronian asteroids of 0.24 and thus calculates a smaller diameter of 5.2 kilometers, as the higher the albedo (reflectivity), the smaller a body's diameter at a certainabsolute magnitude (brightness).[3]
In August 2012, a photometriclightcurve ofIkeller was obtained from photometric observations by astronomers at thePalomar Transient Factory in California. Lightcurve analysis gave arotation period of7.0423 hours with a brightness variation of 0.44magnitude (U=2).[6]
Thisminor planet was named by the discoverer after his wife, Ingeborg Bickel–Keller (born 1941).[2] The approved naming citation was published by theMinor Planet Center on 16 January 2014 (M.P.C. 86713).[8]
