6489 Golevka

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 (9.3 mi) 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. ^ a b c d e f "JPL Small-Body Database Browser: 6489 Golevka (1991 JX)". Jet Propulsion Laboratory. Retrieved 11 April 2016.
  2. ^ a b David Morrison (14 January 2004). "Precision NEO Orbits and the Yarkovsky Effect". Asteroid and Comet Impact Hazards (NASA). Archived from the original on 8 November 2005. Retrieved 15 April 2004.
  3. ^ "NEODys (6489) Golevka". Department of Mathematics, University of Pisa, ITALY. Retrieved 16 March 2009.
  4. ^ 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

Wikimedia Commons has media related to 6489 Golevka.
  • Intercontinental Bistatic Radar Observations of 6489 Golevka (1991 JX)
  • 6489 Golevka at NeoDyS-2, Near Earth Objects—Dynamic Site
    • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
  • 6489 Golevka at ESA–space situational awareness
    • Ephemerides · Observations · Orbit · Physical properties · Summary
  • 6489 Golevka at the JPL Small-Body Database Edit this at Wikidata
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters
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