6489 Golevka

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6489 Golevka
Asteroid-golevka.jpeg
Computer-generated model of Golevka based on Arecibo radar data
Discovery
Discovered by Eleanor F. Helin
Discovery date 10 May 1991
Designations
MPC designation (6489) Golevka
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)
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]

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[edit]

  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 (January 14, 2004). "Precision NEO Orbits and the Yarkovsky Effect". Asteroid and Comet Impact Hazards (NASA). Retrieved 2004-04-15. 
  3. ^ "NEODys (6489) Golevka". Department of Mathematics, University of Pisa, ITALY. Retrieved 2009-03-16. 
  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[edit]