6489 Golevka
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| Discovery A (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html) | |
|---|---|
| Discoverer | Eleanor F. Helin |
| Discovery date | May 10, 1991 |
| Alternate designations | 1991 JX B (http://cfa-www.harvard.edu/iau/MPDes.html) |
| Category | Alinda, Apollo, Mars-crosser |
| Orbital elements C (http://asteroid.lowell.edu/) Epoch July 14, 2004 (JD 2453200.5) | |
| Eccentricity (e) | 0.605 |
| Semi-major axis (a) | 373.659 Gm (2.498 AU) |
| Perihelion (q) | 147.552 Gm (0.986 AU) |
| Aphelion (Q) | 599.766 Gm (4.009 AU) |
| Orbital period (P) | 1441.860 d (3.95 a) |
| Mean orbital speed | 18.85 km/s |
| Inclination (i) | 2.277° |
| Longitude of the ascending node (Ω) | 210.952° |
| Argument of perihelion (ω) | 66.832° |
| Mean anomaly (M) | 97.918° |
| Physical characteristics | |
| Dimensions | 0.53 km |
| Mass | 2.10×1011 kg |
| Density | 2.7 g/cm³ |
| Surface gravity | 0.0002 m/s² |
| Escape velocity | 0.0003 km/s |
| Rotation period | 0.2511 d 1 (http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm) |
| Spectral class | ? |
| Absolute magnitude | 19.2 |
| Albedo | 0.10 |
| Mean surface temperature | ~176 K |
6489 Golevka is an Apollo, Mars-crosser and Alinda asteroid, discovered in 1991 by Eleanor F. Helin.
Its name has a complicated origin. In 1995, Golevka was studied simultaneously by three radar observatories across the world: Goldstone in California, Evpatoria in Ukraine (sometimes written Yevpatoriya), and Kashima in Japan. 'Golevka' comes from the first few letters of each observatory's name.
Golevka is a small object, measuring 0.6×1.4 km. The radar observations revealed that it has a very strange, angular shape that looks different from almost every angle. In 2003 the Yarkovsky effect was first observed at work by high precision radar observations of Golevka. This helped evaluate the asteroid's density (2.7±0.5 g/cm³) and mass (2.10×1011 kg).
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| (For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.) |