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 | |
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Discovered by | K. Reinmuth |
Discovery site | Heidelberg |
Discovery date | 4 October 1920 |
Designations | |
MPC designation | (939) Isberga |
Alternative designations | 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) |
Semi-major axis | 2.2475 AU (336.22 Gm) |
Eccentricity | 0.17683 |
Orbital period (sidereal) | 3.37 yr (1230.7 d) |
Mean anomaly | 189.16° |
Mean motion | 0° 17m 33.072s / day |
Inclination | 2.5864° |
Longitude of ascending node | 327.137° |
Argument of perihelion | 5.9622° |
Physical characteristics | |
Synodic rotation period | 2.9173 h (0.12155 d) |
Absolute magnitude (H) | 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. [permanent dead link]
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