6489 Golevka
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| |
| Discovery | |
|---|---|
| Discovered by | Eleanor F. Helin |
| Discovery date | 10 May 1991 |
| Designations | |
| 1991 JX | |
|
Alinda, Apollo, PHA,[1] Mars-crosser | |
| Orbital characteristics[1] | |
| Epoch 6 November 2001 (JD 2452219.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 8968 days (24.55 yr) |
| Aphelion | 4.021663 AU (601.6322 Gm) |
| Perihelion | 0.992813 AU (148.5227 Gm) |
| 2.507238 AU (375.0775 Gm) | |
| Eccentricity | 0.604021 |
| 3.97 yr (1450.1 d) | |
Average orbital speed | 16.980 km/s |
| 213.841234° | |
| 0° 14m 53.744s / day | |
| Inclination | 2.278065° |
| 211.596909° | |
| 65.939347° | |
| Earth MOID | 0.0288423 AU (4.31475 Gm) |
| Jupiter MOID | 1.13922 AU (170.425 Gm) |
| Jupiter Tisserand parameter | 3.181 |
| Physical characteristics | |
| Dimensions | 0.53 km[1] |
Mean radius | 0.265 ± 0.015 km |
| Mass | 2.10 × 1011 kg |
Mean density |
2.7+0.4 −0.6 g/cm³ |
Equatorial surface gravity | 0.0002 m/s² |
Equatorial escape velocity | 0.0003 km/s |
| 6.026 h (0.2511 d)[1] | |
| 0.151 ± 0.023[1] | |
| Temperature | ~176 K |
| Q | |
| 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).
Golevka 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] On the other hand, 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. However, Toutatis is better known due to a close approach to Earth in 2004.
References
- 1 2 3 4 5 6 "JPL Small-Body Database Browser: 6489 Golevka (1991 JX)". Jet Propulsion Laboratory. Retrieved 11 April 2016.
- 1 2 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, R.; 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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