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]
 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 | |
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]
References
edit- ^ a b c Yeomans, Donald K., "191 Kolga", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
- ^ P. Maley; T. George; J. Bardecker; T. Blank; D. Dunham; D. Kenyon; J. Gout; M. Collins; B. Gimple; W. Thomas; J. Bean; R. Sumner; M. Collins (9 February 2018), Stellar occultation from 191 Kolga (preliminary analysis), archived from the original on 4 October 2018, retrieved 3 October 2018
- ^ a b Fienga, A.; Avdellidou, C.; Hanuš, J. (February 2020). "Asteroid masses obtained with INPOP planetary ephemerides" (PDF). Monthly Notices of the Royal Astronomical Society. 492 (1). doi:10.1093/mnras/stz3407.
- ^ a b Warner, Brian D. (October 2009), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March-June", The Minor Planet Bulletin, 36 (4): 172–176, arXiv:1203.4336, Bibcode:2009MPBu...36..172W, doi:10.1016/j.pss.2012.03.009.
- ^ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (PDF) (6th ed.), Springer, p. 30, ISBN 978-3642297182.
External links
edit- Lightcurve plot of 191 Kolga, Palmer Divide Observatory, B. D. Warner (2009)
- Asteroid Lightcurve Database (LCDB), query form (info Archived 21 July 2011 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 191 Kolga at AstDyS-2, Asteroids—Dynamic Site
- 191 Kolga at the JPL Small-Body Database
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