(52246) Donald Johnson
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Asteroid (52246) Donaldjohanson |
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| Properties of the orbit ( animation ) | |
| Orbit type | Inner main belt asteroid |
| Major semi-axis | 2.3829 AU |
| eccentricity | 0.1873 |
| Perihelion - aphelion | 1.9367 AU - 2.8292 AU |
| Inclination of the orbit plane | 4.4236 ° |
| Length of the ascending node | 262.8215 ° |
| Argument of the periapsis | 213.2038 ° |
| Time of passage of the perihelion | April 1, 2021 |
| Sidereal period | 3.68 a |
| Mean orbital velocity | 19.12 km / s |
| Physical Properties | |
| Medium diameter | 3.895 (± 0.013) km |
| Albedo | 0.103 (± 0.019) |
| Absolute brightness | 15.5 mag |
| history | |
| Explorer | Scolded John Bus |
| Date of discovery | March 2, 1981 |
| Another name | 1981 EQ 5 , 1998 YF 26 |
| 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. | |
(52246) Donaldjohanson is an asteroid located in the inner main belt . It was discovered on March 2, 1981 by the American astronomer Schelte John Bus at the Siding Spring Observatory ( IAU code 413) in the Australian Warrumbungle National Park .
The mean diameter of the asteroid was calculated to be 3.895 (± 0.013) kilometers, the albedo to be 0.103 (± 0.019).
(52246) Donaldjohanson was named on December 25, 2015 after the American paleoanthropologist Donald Johanson (* 1943). Johanson was a co-discoverer of Lucy , a fossil of an Australopithecus afarensis . The asteroid (32605) Lucy , discovered by William Kwong Yu Yeung in 2001, was named after Lucy in 2008 .
Asteroid family
The Italian astronomer Vincenzo Zappalà used a hierarchical cluster analysis in a publication from 1995 (et al.) To extrapolate the asteroid's membership of the Erigone family, a group of asteroids named after (163) Erigone . Belonging to the Erigone family was also published by Thais Mothé-Diniz, Fernando Roig and Jorge Márcio Carvano in 2012 and David Nesvorny in 2015.
In the AstDyS-2 database, (52246) Donaldjohanson is not assigned to any asteroid family.
The Lucy spacecraft fly by
The spacecraft Lucy will on October 16, 2021 from Space Launch Complex 41 of the Cape Canaveral Air Force Station stand to Jupiter Trojans explore. On the way to Jupiter it is planned that the probe will approach Donaldjohanson on April 20, 2025 (52246) to 922 kilometers, in order to then fly on to the Jupiter Trojan (3548) Eurybates , on which it will fly in 1000 on August 12, 2027 Kilometers away. When flying past (52246) Donaldjohanson, the probe will have a speed of 13.4 km / s (48,240 km / h).
Web links
- (52246) Donaldjohanson in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (52246) Donaldjohanson in the Small-Body Database of the Jet Propulsion Laboratory of NASA at the California Institute of Technology (Caltech) in Pasadena , California (English)
- Discovery Circumstances by (52246) Donaldjohanson according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ↑ (32605) Lucy in the Small-Body Database of the Jet Propulsion Laboratory (English).
- ↑ Database with the assignment of 12,487 asteroids to asteroid groups (English)
- ↑ Mothe-Diniz Asteroid Dynamical Families V1.1 . (English)
- ↑ Nesvorny HCM Asteroid Families V3.0 . (English)
- ↑ Brochure on the Lucy space probe ( PDF , 3.6 MB; English)