6489 Golevka is an
Apollo,
Mars-crosser, and
Alinda asteroid discovered in 1991 by
Eleanor F. Helin
Eleanor Francis "Glo" Helin (née Francis, 19 November 1932 – 25 January 2009) was an American astronomer. She was principal investigator of the Near-Earth Asteroid Tracking (NEAT) program of NASA's Jet Propulsion Laboratory. (Some sources gi ...
.
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
The Yevpatoria RT-70 radio telescope (P-2500, RT-70) is an RT-70 radio telescope and planetary radar at the Center for Deep Space Communications, Yevpatoria, Crimea. In the scientific literature is often called Evpatoria Planetary Radar (EPR).
...
in
Ukraine (
Yevpatoria is sometimes
romanized
Romanization or romanisation, in linguistics, is the conversion of text from a different writing system to the Roman (Latin) script, or a system for doing so. Methods of romanization include transliteration, for representing written text, and ...
as Evpatoria) and
Kashima in
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
. '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
Aleksandr Leonidovich Zaitsev (russian: Александр Леонидович Зайцев; 19 May 1945 – 29 November 2021) was a Russian and Soviet radio engineer and astronomer from Fryazino. He worked on radar astronomy devices, near-Ear ...
.
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.
Between 1991 and 2003, the small force of the Yarkovsky effect caused a shift of from what would be expected based on only gravitational interactions.
This helped evaluate the asteroid's bulk density (2.7 ± 0.5 g/cm
3) and mass (2.10 kg).
Golevka approaches Earth to in 2046, 0.10 AU in 2069, and 0.11 AU in 2092.
[ On the other hand, Golevka's collision probability with any planet is negligible for at least the next nine centuries.][ Its orbit is strikingly similar to that of ]4179 Toutatis
4179 Toutatis, provisional designation , is an elongated, stony asteroid and slow rotator, classified as a near-Earth object and potentially hazardous asteroid of the Apollo asteroid and Alinda asteroid groups, approximately 2.5 kilometers in d ...
in eccentricity, semi-major axis, and inclination. However, Toutatis is better known due to a close approach to Earth in 2004.
References
External links
Intercontinental Bistatic Radar Observations of 6489 Golevka (1991 JX)
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Discoveries by Eleanor F. Helin
Named minor planets
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