939 Isberga

939 Isberga

Discovery
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

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]

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 ]}

References

1. "939 Isberga (1920 HR)". JPL Small-Body Database . NASA/Jet Propulsion Laboratory . Retrieved 2 May 2016.
2. Lutz D. Schmadel, Dictionary of Minor Planet Names, 5th edtn. (2003), p.83.

External links

• 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
  • Ephemeris  · Observation prediction  · Orbital info  · Proper elements  · Observational info
• 939 Isberga at the JPL Small-Body Database
  • Close approach  · Discovery  · Ephemeris  · Orbit viewer  · Orbit parameters  · Physical parameters