917 Lyka
917 Lyka (prov. designation: A915 RR or 1915 S4) is a background asteroid, approximately 32 kilometers (20 miles) in diameter, located in the inner region of the asteroid belt. It was discovered on 5 September 1915, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The X-type asteroid has a rotation period of 7.9 hours and is likely spherical in shape. It was named after Lyka, a friend of the discoverer's sister.
| Discovery | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 5 September 1915 |
| Designations | |
MPC designation | (917) Lyka |
Named after | Lyka, a friend of the discoverer's sister |
Alternative designations | A915 RR · 1950 BS 1951 JJ · 1915 S4 1915 Σ4 |
Minor planet category | main-belt · (inner) background |
| Orbital characteristics | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 100.18 yr (36,591 d) |
| Aphelion | 2.8590 AU |
| Perihelion | 1.9035 AU |
Semi-major axis | 2.3812 AU |
| Eccentricity | 0.2006 |
Orbital period (sidereal) | 3.67 yr (1,342 d) |
Mean anomaly | 181.91° |
Mean motion | 0° 16m 5.52s / day |
| Inclination | 5.1264° |
Longitude of ascending node | 343.38° |
| 359.90° | |
| Physical characteristics | |
Mean diameter |
|
Synodic rotation period | 7.867±0.006 h |
| |
| X (S3OS2) | |
| 11.6 | |
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