Back 191 Kolga (كويكب) ARZ 191 Kolga AST (191) Колга Byelorussian (191) Kolga Catalan (191) Колга CE (191) Kolga German 191 Κόλγκα Greek 191 Kolga Esperanto (191) Kolga Spanish 191 Kolga Basque
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 30 September 1878 |
| Designations | |
| (191) Kolga | |
| Pronunciation | /ˈkɒlɡə/ |
Named after | Kólga |
| Main belt | |
| Orbital characteristics[1] | |
| 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) |
| 2.8951 AU (433.10 Gm) | |
| Eccentricity | 0.091106 |
| 4.93 yr (1799.2 d) | |
| 326.28° | |
| 0° 12m 0.288s / day | |
| Inclination | 11.508° |
| 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[2] |
| 94.536±0.433 km[1] | |
| Mass | (7.24 ± 4.11/2.17)×1017 kg[3] |
Mean density | 1.637 ± 0.928/0.491 g/cm3[3] |
| 17.625 hours[4] 17.604 h (0.7335 d)[1] | |
| 0.0408±0.003 | |
| 9.07 | |
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.[5]
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.[4]
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