(3990) Heimdal
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Asteroid (3990) Heimdal |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main outer belt asteroid |
| Major semi-axis | 3.9392 AU |
| eccentricity | 0.2402 |
| Perihelion - aphelion | 2.9929 AU - 4.8855 AU |
| Inclination of the orbit plane | 9.4967 ° |
| Length of the ascending node | 192.6656 ° |
| Argument of the periapsis | 197.8626 ° |
| Time of passage of the perihelion | 15th August 2019 |
| Sidereal period | 7.82 a |
| Mean orbital velocity | 15.01 km / s |
| Physical Properties | |
| Medium diameter | 35.679 km (± 0.330) |
| Albedo | 0.067 (± 0.021) |
| Absolute brightness | 10.8 mag |
| history | |
| Explorer | Poul Jensen |
| Date of discovery | September 25, 1987 |
| Another name | 1987 SO 3 , 1971 QJ 3 , 1972 TG 2 , 1972 XM, 1979 SA 3 , 1988 XK 2 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(3990) Heimdal is an asteroid of the main outer belt , which was discovered on September 25, 1987 by the Danish astronomer Poul Jensen at the Schmidt telescope of the Brorfelde observatory ( IAU code 054) near Holbæk . There had already been several unconfirmed sightings of the asteroid at the Crimean Observatory in Nautschnyj : on August 18, 1971 with the provisional designation 1971 QJ 3 and on October 8, 1972 (1972 TG 2 ), December 2, 1972 (1972 XM) and September 23, 1979 (1979 SA 3 ).
The asteroid is in a 3: 2 orbital resonance with the planet Jupiter , which means that if the sun orbits Jupiter two times, the asteroid orbits the sun three times.
In 2011, a light curve of the asteroid was recorded with the CCD sensors of the 70 cm reflector telescope at the Chuguevskaya Station belonging to the National W. N. Karasin University of Kharkiv . The measurements suggest that the rotation period could be 20 hours. It was assumed that (3990) Heimdal belonged to the Hilda group , a group of asteroids whose namesake is the asteroid (153) Hilda .
(3990) Heimdal was named on September 1, 1993 after Heimdall , a god from Norse mythology . The Mars crater Heimdal, however, was named in 2008 after the Norwegian town Heimdal . A surface formation in the solar system named after the Nordic god is Heimdall crater on Jupiter's moon Callisto .
See also
Web links
- (3990) Heimdal in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (3990) Heimdal in the Small-Body Database of the Jet Propulsion Laboratory (English).
- Discovery Circumstances by (3990) Heimdal according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ↑ (3990) Heimdal at the IAU Minor Planet Center (English)
- ↑ The orbital response of (3990) Heimdal in the AstDyS-2 database (English)
- ↑ IG Slyusarev, VG Shevchenko, IN Belskaya , Yurij N. Krugly , VG Chiorny: MAGNITUDE PHASE ANGLE DEPENDENCES OF JUPITER TROJANS AND HILDA ASTEROIDS . 43d Lunar and Planetary Science Conference, 2012 ( PDF ; English)
- ↑ Heimdal Mars Crater in the Gazetteer of Planetary Nomenclature of the IAU (WGPSN) / USGS
- ↑ Heimdal Kallistokrater in the Gazetteer of Planetary Nomenclature of the IAU (WGPSN) / USGS