6489 Golevka
From Wikipedia, the free encyclopedia
|
Discovery
|
|
|---|---|
| Discovered by | Eleanor F. Helin |
| Discovery date | May 10, 1991 |
|
Designations
|
|
| Alternative names | 1991 JX |
| Minor planet category |
Alinda, Apollo, Mars-crosser |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 599.766 Gm (4.009 AU) |
| Perihelion | 147.552 Gm (0.986 AU) |
| Semi-major axis | 373.659 Gm (2.498 AU) |
| Eccentricity | 0.605 |
| Orbital period | 1441.860 d (3.95 a) |
| Average orbital speed | 16.980 km/s |
| Mean anomaly | 97.918° |
| Inclination | 2.277° |
| Longitude of ascending node | 210.952° |
| Argument of perihelion | 66.832° |
|
Physical characteristics
|
|
| Dimensions | 0.53 km |
| Mass | 2.10×1011 kg |
| Mean density | 2.7 g/cm³ |
| Equatorial surface gravity | 0.0002 m/s² |
| Escape velocity | 0.0003 km/s |
| Rotation period | 0.2511 d 1 |
| Albedo | 0.10 |
| Temperature | ~176 K |
| Spectral type | ? |
| Absolute magnitude | 19.2 |
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, Eupatoria in Crimea, Ukraine (sometimes written Evpatoria or 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 bulk density (2.7 ± 0.5 g/cm³) and mass (2.10×1011 kg).
It approaches Earth to 7.6 Gm in 2046, 15.1 Gm in 2069, and 16.6 Gm in 2092.
Computer-generated images of Golevka:
 |
 |
 |
