191 Kolga
191 Kolga (minor planet designation: 191 Kolga) is a large, dark main-belt asteroid that was discovered by German-American astronomer C. H. F. Peters on September 30, 1878, in Clinton, New York. It is named after Kólga, the daughter of Ægir in Norse mythology.
Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 30 September 1878 |
| Designations | |
MPC designation | (191) Kolga |
| Pronunciation | /ˈkɒlɡə/ |
Named after | Kólga |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 131.26 yr (47942 d) |
| Aphelion | 3.1588 AU (472.55 Gm) |
| Perihelion | 2.6313 AU (393.64 Gm) |
Semi-major axis | 2.8951 AU (433.10 Gm) |
| Eccentricity | 0.091106 |
Orbital period (sidereal) | 4.93 yr (1799.2 d) |
Mean anomaly | 326.28° |
Mean motion | 0° 12m 0.288s / day |
| Inclination | 11.508° |
Longitude of ascending node | 159.31° |
| 227.00° | |
| Earth MOID | 1.64648 AU (246.310 Gm) |
| Jupiter MOID | 2.29413 AU (343.197 Gm) |
| TJupiter | 3.253 |
| Physical characteristics | |
| Dimensions | (134.3±12.8) × (78.2±1.7) km |
Mean diameter | 94.536±0.433 km |
| Mass | (7.24 ± 4.11/2.17)×1017 kg |
Mean density | 1.637 ± 0.928/0.491 g/cm3 |
Synodic rotation period | 17.625 hours 17.604 h (0.7335 d) |
| 0.0408±0.003 | |
| 9.07 | |
In 2009, Photometric observations of this asteroid were made at the Palmer Divide Observatory in Colorado Springs, Colorado. The resulting light curve shows a synodic rotation period of 17.625 ± 0.004 hours with a brightness variation of 0.30 ± 0.03 in magnitude. Previous independent studies produced inconsistent results that differ from this finding.
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