Astronomy:(277475) 2005 WK4

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(277475) 2005 WK4
Radar Goldstone (277475) 2005 WK4.jpg
2005 WK4 imaged 30 times by radar at Goldstone on 8 August 2013
Discovery[1][2]
Discovered bySiding Spring Srvy.
Discovery siteSiding Spring Obs.
Discovery date27 November 2005
Designations
(277475) 2005 WK4
2005 WK4
Minor planet categoryApollo · NEO · PHA[1][2]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc8.71 yr (3,180 days)
|{{{apsis}}}|helion}}1.2506 AU
|{{{apsis}}}|helion}}0.7707 AU
1.0106 AU
Eccentricity0.2374
Orbital period1.02 yr (371 days)
Mean anomaly81.040°
Mean motion0° 58m 12.36s / day
Inclination9.8433°
Longitude of ascending node138.14°
74.063°
Earth MOID0.0037 AU · 1.4 LD
Physical characteristics
Dimensions0.25±0.05 km[lower-alpha 1]
0.284 km (calculated)[3]
Rotation period2.595±0.002 h[4]
2.7±0.1 h[lower-alpha 1]
2.73±0.05 h[5]
Geometric albedo0.20 (assumed)[3]
Sk[6] · S (assumed)[3]
B–V = 0.677±0.025[6]
V–R = 0.446±0.019[6]
V–I = 0.750±0.024[6]
Absolute magnitude (H)20.1[1][3]


(277475) 2005 WK4, provisional designation 2005 WK4, is a stony, sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group that passed Earth within 8.2 lunar distances on 8 August 2013.[7] It was discovered on 27 November 2005, by astronomers of the Siding Spring Survey at Siding Spring Observatory, Australia.[2]

Description

In August 2013, 2005 WK4 was radar-imaged by the Deep Space Network dish at Goldstone Observatory, United States,[7] and had been observed previously at Arecibo Observatory in July 2012 (this was not a close approach though).[8]

Physical characteristics

2005 WK4 measures approximately 250 meters in diameter, and has a rotation period of 2.595 hours.[3][4][lower-alpha 1] Its spectral type is that of an Sk-subtype, which transitions from the stony S-type to the uncommon K-type asteroids.[6]

See also

  • List of asteroid close approaches to Earth in 2013

Notes

  1. ↑ 1.0 1.1 1.2 Benner (2013): radiometric observations: mean-diameter 0.25±0.05 km; rotation period 2.7±0.1 hours. Summary figures at the LCDB; also see NASA news report

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 277475 (2005 WK4)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2277475. Retrieved 20 January 2018. 
  2. ↑ 2.0 2.1 2.2 "277475 (2005 WK4)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=277475. Retrieved 20 January 2018. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "LCDB Data for (277475)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=277475%7C. Retrieved 20 January 2018. 
  4. ↑ 4.0 4.1 Stephens, Robert D. (January 2014). "Asteroids Observed from CS3: 2013 July-September". The Minor Planet Bulletin 41 (1): 13–15. ISSN 1052-8091. Bibcode: 2014MPBu...41...13S. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41...13S. Retrieved 20 January 2018. 
  5. ↑ Behrend, Raoul. "Asteroids and comets rotation curves – (277475)". Geneva Observatory. http://obswww.unige.ch/~behrend/page5cou.html#277475. Retrieved 20 January 2018. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Hicks, M.; Buratt, B.; Carcione, A.; Borlase, R. (August 2013). "Broadband Photometry Of The Potentially Asteroid 277475 (2005 WK4) and Corrected 52762 (1998 MT24) Colors.". The Astronomer's Telegram 5311 (5311): 1. Bibcode: 2013ATel.5311....1H. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013ATel.5311....1H. Retrieved 20 January 2018. 
  7. ↑ 7.0 7.1 "Radar Images of Asteroid 2005 WK4". http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130815.html#.Ug58vPJJqOI. 
  8. ↑ 2005WK4 - Background

External links



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