(939) Isberg ( Latin Isberga ) is an asteroid of the main asteroid belt belonging to the spectral class S. The asteroid was discovered on October 4, 1920 by the German astronomer Karl Reinmouth at the Heidelberg-Königstuhl Observatory , Germany . The asteroid was named after a female name, taken from the German annual calendar Lahrer hinkender Bote , and in no way connected with contemporaries of Rheymouth. Giving names to asteroids without reference to a specific person was a common practice of an astronomer. [one]
| (939) Isberg | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | Karl Rainmouth |
| Place of discovery | Heidelberg-Königstuhl Observatory |
| Discovery date | October 4, 1920 |
| Alternative notation | A920 TD; 1930 QP; 1957 QE; 1957 UU |
| Category | Main ring |
| Orbital characteristics | |
| Age of April 27, 2019 JD 2458600.5 | |
| Eccentricity ( e ) | 0.17667 |
| Semimajor axis ( a ) | 336.154 million km (2.24705 AU ) |
| Perihelion ( q ) | 276.766 million km (1.85006 AU) |
| Aphelion ( Q ) | 395.542 million km (2.64404 AU) |
| Circulation Period ( P ) | 1230.318 days (3.368 g. ) |
| Average orbital speed | 19.713 km / s |
| Inclination ( i ) | 2.5836 ° |
| Longitude node (Ω) | 327,054 ° |
| Perihelion Argument (ω) | 6,272 ° |
| Median Anomaly ( M ) | 121.442 ° |
| physical characteristics | |
| Diameter | 10.39 km |
| Weight | 3.61x10 15 kg |
| Density | 2.91 g / cm³ |
| Rotation period | 2,917 h |
| Spectral class | S |
| Apparent magnitude | 17.61 m (current) |
| Absolute magnitude | 12.14 m |
| Albedo | 0.228 |
| Current distance from the sun | 2.635 a. e. |
| Current distance from earth | 3,474 a. e. |
Content
- 1 Orbit
- 2 Rotation and satellite
- 3 See also
- 4 notes
- 5 Links
Orbit
The asteroid’s orbit lies in the interior of the main asteroid belt, with a slight tilt and eccentricity. The Earth’s orbit does not cross. The parameters of the orbit are close to the parameters of the orbits of the asteroids of the Flora family . Since the boundaries of one of the largest families of asteroids are quite blurred, now the asteroid is assigned to this group. [2] [3]
Rotation and satellite
Based on the asteroid’s light curves, the Isberg rotation period of 2.9173 hours was calculated, which is fast enough. Since February 26, 2006, a second periodicity was observed in the light curves of the asteroid. From this fact, it is assumed that the asteroid has a second component . [4] The satellite has an orbital period of 26.8 hours and a size of about 3.6 km. The distance between the components is about 33 km. [5]
The density of both bodies is estimated at 2.91 g / cm 3 , which is lower than the density of ordinary class A asteroids. This indicates the existence of pores and voids inside. [6]
See also
- List of asteroids ( 901-1000 )
- Classifications of Minor Planets
- (22) Calliope
Notes
- ↑ Lutz D. Schmadel. Dictionary of Minor Planet Names . - Springer Science & Business Media, 2012-06-10. - 1458 s. - ISBN 9783642297182 .
- ↑ JPL Small-Body Database Browser . ssd.jpl.nasa.gov. Date accessed August 23, 2019.
- ↑ 1969Ap & SS ... 4 ... 84A Page 88 . articles.adsabs.harvard.edu. Date accessed August 23, 2019.
- ↑ Molnar, Lawrence A .; Haegert, Melissa, J .; Beaumont. Lightcurve Analysis of a Magnitude Limited Asteroid Sample . NASA / ADS . ui.adsabs.harvard.edu (March 2008). Date accessed August 23, 2019.
- ↑ Asteroids with satellites . www.johnstonsarchive.net. Date accessed August 23, 2019.
- ↑ F. Vachier, J. Strajnic, K. Sobkowiak, F. Richard, E. Morelle. The small binary asteroid (939) Isberga . - 2014-11-04. - DOI : 10.1016 / j.icarus.2014.11.002 .
Links
- NASA JPL Small Solar System Bodies (939 Isberga )
- Small Solar System MPC Database (939 Isberga )
- Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003 .-- 992 p. - ISBN 3-540-00238-3 .