939 Isberga is a background asteroid from the inner asteroid belt near the region of the Flora family. It was discovered from Heidelberg on 4 October 1920 by Karl Wilhelm Reinmuth. As was his common practice, Reinmuth gave the asteroid a feminine name without reference to any specific person.[2]
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg |
| Discovery date | 4 October 1920 |
| Designations | |
| (939) Isberga | |
| 1920 HR; 1930 QP; 1957 QE; 1957 UU | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 95.52 yr (34889 days) |
| Aphelion | 2.6449 AU (395.67 Gm) |
| Perihelion | 1.8501 AU (276.77 Gm) |
| 2.2475 AU (336.22 Gm) | |
| Eccentricity | 0.17683 |
| 3.37 yr (1230.7 d) | |
| 189.16° | |
| 0° 17m 33.072s / day | |
| Inclination | 2.5864° |
| 327.137° | |
| 5.9622° | |
| Physical characteristics | |
| 2.9173 h (0.12155 d) | |
| 12.14 | |
Isberga rotates quickly, with a period of 2.9173 hours. It is also suspected to be a binary asteroid, due to a second periodicity observed in its lightcurve from 24 Feb to 4 Mar 2006. The secondary object has an orbital period of 26.8 hours, but its size is undetermined. [1][permanent dead link]
References edit
- ^ "939 Isberga (1920 HR)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 2 May 2016.
- ^ Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), p.83.
External links edit
- Asteroids with Satellites, Robert Johnston, johnstonsarchive.net
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 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
- 939 Isberga at AstDyS-2, Asteroids—Dynamic Site
- 939 Isberga at the JPL Small-Body Database
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