6489 Golevka
 | |
| Discovery | |
|---|---|
| Discovered by | Eleanor F. Helin |
| Discovery date | May 10, 1991 |
| Designations | |
| Alternative names | 1991 JX |
| Minor planet category |
Alinda, Apollo, Mars-crosser |
| Orbital characteristics | |
| Epoch 2012-Mar-14 (JD 2456000.5) | |
| Aphelion |
4.0125 AU (600.2 Gm) |
| Perihelion |
0.98652 AU (147.6 Gm) |
| Semi-major axis |
2.4995 AU (373.9 Gm) |
| Eccentricity | 0.60531 |
| Orbital period | 3.95 a (1443.3 d) |
| Average orbital speed | 16.980 km/s |
| Mean anomaly | 76.901° |
| Inclination | 2.2777° |
| Longitude of ascending node | 210.86° |
| Argument of perihelion | 66.956° |
| Physical characteristics | |
| Dimensions | 0.53 km[1] |
| 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 | 6.026 hr[1] |
| Albedo | 0.15[1] |
| Temperature | ~176 K |
| Absolute magnitude (H) | 19.2[1] |
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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.[2] Between 1991 and 2003, the small force of the Yarkovsky Effect caused a shift of 15 kilometers (9.4 miles) from what would be expected based on only gravitational interactions.[2] This helped evaluate the asteroid's bulk density (2.7 ± 0.5 g/cm³) and mass (2.10×1011 kg).
It approaches Earth to 0.05 AU (7,500,000 km; 4,600,000 mi) in 2046, 0.10 AU in 2069, and 0.11 AU in 2092.[3] Golevka's collision probability with any planet is negligible for at least the next nine centuries.[4] Its orbit is strikingly similar to that of 4179 Toutatis in eccentricity, semi-major axis, and inclination. But Toutatis is better known due to a close approach to Earth in 2004.
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 6489 Golevka (1991 JX)". Jet Propulsion Laboratory.
- ↑ 2.0 2.1 David Morrison (January 14, 2004). "Precision NEO Orbits and the Yarkovsky Effect". Asteroid and Comet Impact Hazards (NASA). Retrieved 2004-04-15.
- ↑ "NEODys (6489) Golevka". Department of Mathematics, University of Pisa, ITALY. Retrieved 2009-03-16.
- ↑ Hudson, R.; Ostro, S.; Jurgens, R.; Rosema, K.; Giorgini, J.; Winkler, et al. (2000). "Radar observations and physical model of asteroid 6489 Golevka". Icarus 148 (1): 37–51. Bibcode:2000Icar..148...37H. doi:10.1006/icar.2000.6483. hdl:2014/14189.
External links
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