917 Lyka
| Discovery | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 5 September 1915 |
| Designations | |
| (917) Lyka | |
Named after | Lyka, a friend of the discoverer's sister |
| A915 RR · 1950 BS 1951 JJ · 1915 S4 1915 Σ4 | |
| 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 |
| 2.3812 AU | |
| Eccentricity | 0.2006 |
| 3.67 yr (1,342 d) | |
| 181.91° | |
| 0° 16m 5.52s / day | |
| Inclination | 5.1264° |
| 343.38° | |
| 359.90° | |
| Physical characteristics | |
| |
| 7.867±0.006 h | |
| |
| X (S3OS2) | |
| 11.6 | |
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.