(1957) Angara
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Asteroid (1957) Angara |
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| Properties of the orbit ( animation ) | |
| Orbit type | Main outer belt asteroid |
| Asteroid family | Eos family |
| Major semi-axis | 3.0098 AU |
| eccentricity | 0.0593 |
| Perihelion - aphelion | 2.8314 AU - 3.1882 AU |
| Inclination of the orbit plane | 11.1803 ° |
| Length of the ascending node | 50.7459 ° |
| Argument of the periapsis | 209.2363 ° |
| Time of passage of the perihelion | November 21, 2017 |
| Sidereal period | 5.22 a |
| Mean orbital velocity | 17.17 km / s |
| Physical Properties | |
| Medium diameter | 17.907 km (± 0.108) |
| Albedo | 0.055 (± 0.006) |
| Rotation period | 3.67 h |
| Absolute brightness | 11.36 mag |
| history | |
| Explorer | Lyudmila Chernych |
| Date of discovery | April 1, 1970 |
| Another name | 1970 GF , 1962 WG 1 , 1969 AA |
| 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. | |
(1957) Angara is an asteroid of the outer main belt , which was discovered by the Soviet astronomer Lyudmila Tschernych on April 1, 1970 at the Crimean Observatory in Nautschnyj ( IAU code 095). Unconfirmed sightings of the asteroid had already been made in 1962 (1962 WG 1 ) at the Goethe Link Observatory in Indiana and on January 14, 1969 (1969 AA) at the Crimean Observatory in Nautschnyj.
The Italian astronomer Vincenzo Zappalà defines in a publication from 1995 (et al.) That the asteroid belongs to the Eos family , a group of asteroids which typically have large semiaxes from 2.95 to 3.1 AU , bounded inward by the Kirkwood gap of the 7: 3 resonance with Jupiter , as well as orbital inclinations between 8 ° and 12 °. The group is named after the asteroid (221) Eos . The family is believed to have emerged from a collision more than a billion years ago. The timeless (non- osculating ) orbital elements of (1957) Angara are almost identical to those of three smaller ones if one assumes the absolute magnitude of 14.9, 15.8 and 15.7 compared to 11.36, asteroids: (128951) 2004 TY 132 , (286213) 2001 UG 99 and (353778) 2012 HA 77 .
The mean diameter of the asteroid was calculated to be 17.907 km (± 0.108) and the albedo to be 0.055 (± 0.006).
(1957) Angara was named on June 30, 1977 after the Angara , a right tributary of the Central Siberian Yenisei . In 2006, the asteroid of the central main belt (15804) was named Yenisei after the Yenisei .
Web links
- (1957) Angara in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (1957) Angara in the Small-Body Database of the Jet Propulsion Laboratory (English).
Individual evidence
- ↑ (1957) Angara at the IAU Minor Planet Center (English)
- ↑ Database with the assignment of 12,487 asteroids to asteroid groups (English)
- ↑ David Vokrouhlický , Miroslav Brož , Alessandro Morbidelli , William Bottke , David Nesvorný , Daniel Lazzaro, Andy Rivkin: Yarkovsky footprints in the Eos family ( PDF , 25 MB; English)
- ↑ The family status of the asteroids in the AstDyS-2 database (English, HTML; 51.4 MB)
- ^ Lutz D. Schmadel : Dictionary of Minor Planet Names . Springer-Verlag, Berlin 2003, 5th edition, ISBN 3-540-00238-3 . Page 157 (English)