6489 Golevka
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Discovery
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|---|---|
| Discovered by | Eleanor F. Helin |
| Discovery date | May 10, 1991 |
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Designations
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| Alternate name(s) | 1991 JX |
| Minor planet category |
Alinda, Apollo, Mars-crosser |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion | 4.009 AU (599.766 Gm) |
| Perihelion | 0.986 AU (147.552 Gm) |
| Semi-major axis | 2.498 AU (373.659 Gm) |
| Eccentricity | 0.605 |
| Orbital period | 3.95 a (1441.860 d) |
| 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° |
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Physical characteristics
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| 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 (H) | 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, Yevpatoria RT-70 radio telescope in Ukraine (Yevpatoria is sometimes romanized as Evpatoria) and Kashima in Japan. 'Golevka' comes from the first few letters of each observatory's name; it was proposed by the discoverer following a suggestion by Alexander L. Zaitsev.
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 depending on the direction. In 2003 the Yarkovsky effect was first observed at work by high-precision radar observations of Golevka[1]. 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.[1] Its orbit is strikingly similar to that of 4179 Toutatis in eccentricity, semimajor axis, and inclination. But Toutatis is much more widely known, for even closer approaches to Earth and a chaotic orbit.
Computer-generated images of Golevka:
[edit] References
- ^ "NEODys (6489) Golevka". Department of Mathematics, University of Pisa, ITALY. http://newton.dm.unipi.it/neodys/index.php?pc=1.1.8&n=6489. Retrieved 2009-03-16.
[edit] External links
- Orbital simulation from JPL (Java) / Ephemeris
- Intercontinental Bistatic Radar Observations of 6489 Golevka (1991 JX)
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Wikimedia Commons has media related to: 6489 Golevka |
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