(8489) Boulder
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Asteroid (8489) Boulder |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Main outer belt asteroid |
| Asteroid family | Hygiea family |
| Major semi-axis | 3.1482 AU |
| eccentricity | 0.1128 |
| Perihelion - aphelion | 2.7931 AU - 3.5032 AU |
| Inclination of the orbit plane | 5.8540 ° |
| Length of the ascending node | 146.5598 ° |
| Argument of the periapsis | 97.8605 ° |
| Time of passage of the perihelion | April 12, 2021 |
| Sidereal period | 5.59 a |
| Mean orbital velocity | 16.73 km / s |
| Physical Properties | |
| Medium diameter | 11.211 km (± 0.117) |
| Albedo | 0.081 (± 0.018) |
| Absolute brightness | 13.3 mag |
| history | |
| Explorer | Eric Walter Elst |
| Date of discovery | October 7, 1989 |
| Another name | 1989 TA 3 , 1976 GY 8 , 1993 LH 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. | |
(8489) Boulder is an asteroid of the main outer belt , an asteroid field between Mars and Jupiter . The asteroid was discovered on October 7, 1989 by the Belgian astronomer Eric Walter Elst at the La Silla Observatory of the European Southern Observatory in Chile ( IAU code 809). The asteroid had previously been sighted under the provisional designation 1976 GY 8 on April 4, 1976 at the Crimean Observatory in Nautschnyj .
The asteroid belongs to the Hygiea family, a rather older group of asteroids, as is believed, the largest member of which is the asteroid (10) Hygiea . The ageless (not osculating ) orbital elements of (8489) Boulder are almost identical with those of six smaller (when one of the absolute brightness , 14.1, 14.8, 15.4, 15.1, 15.4 and 16 0 versus 13.3) Asteroids: (61642) 2000 QE 107 , (99785) 2002 JU 133 , (141293) 2001 YD 86 , (165704) 2001 PD 61 , (165960) 2001 XR 157 and (266442) 2007 HC 65 .
The mean diameter of (8489) boulder was calculated to be 11.211 km (± 0.117), the albedo as 0.081 (± 0.018).
According to the SMASS classification ( Small Main-Belt Asteroid Spectroscopic Survey ), a spectroscopic study by Gianluca Masi , Sergio Foglia and Richard P. Binzel subdivided all examined asteroids into C, S and V types (8489) assigned to the C asteroids .
The asteroid was named after the US city of Boulder , Colorado on April 2, 1999 . Eric-Walter Elst and his wife spent a year there at the Joint Institute for Laboratory Astrophysics (JILA) at the University of Colorado Boulder in 1967/68 .
Web links
- (8489) Boulder in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- (8489) Boulder 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 of (8489) Boulder according to the Minor Planet Center of the International Astronomical Union at the Harvard-Smithsonian Center for Astrophysics in Cambridge , Massachusetts (English)
Individual evidence
- ↑ (8489) Boulder at the IAU Minor Planet Center (English)
- ↑ The family affiliation of (8489) Boulder in the AstDyS-2 database (English)
- ↑ The family status of the asteroids in the AstDyS-2 database (English, HTML; 51.4 MB)
- ^ Gianluca Masi, Sergio Foglia, Richard P. Binzel: Search for Unusual Spectroscopic Candidates Among 40313 minor planets from the 3rd Release of the Sloan Digital Sky Survey Moving Object Catalog . (English)
- ↑ subdivision of asteroids to S-types, C-types and V-types (English)