(277475) 2005 WK4

(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]

(277475) 2005 WK4
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
Apollo · NEO · PHA  [1][2]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc8.71 yr (3,180 days)
Aphelion1.2506 AU
Perihelion0.7707 AU
1.0106 AU
Eccentricity0.2374
1.02 yr (371 days)
81.040°
0° 58m 12.36s / day
Inclination9.8433°
138.14°
74.063°
Earth MOID0.0037 AU · 1.4 LD
Physical characteristics
Dimensions0.25±0.05 km[lower-alpha 1]
0.284 km (calculated)[3]
2.595±0.002 h[4]
2.7±0.1 h[lower-alpha 1]
2.73±0.05 h[5]
0.20 (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]
20.1[1][3]

    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

    Notes
    1. 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. "JPL Small-Body Database Browser: 277475 (2005 WK4)" (2014-08-12 last obs.). Jet Propulsion Laboratory. Retrieved 20 January 2018.
    2. "277475 (2005 WK4)". Minor Planet Center. Retrieved 20 January 2018.
    3. "LCDB Data for (277475)". Asteroid Lightcurve Database (LCDB). Retrieved 20 January 2018.
    4. Stephens, Robert D. (January 2014). "Asteroids Observed from CS3: 2013 July-September". The Minor Planet Bulletin. 41 (1): 13–15. Bibcode:2014MPBu...41...13S. ISSN 1052-8091. Retrieved 20 January 2018.
    5. Behrend, Raoul. "Asteroids and comets rotation curves – (277475)". Geneva Observatory. Retrieved 20 January 2018.
    6. 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). Bibcode:2013ATel.5311....1H. Retrieved 20 January 2018.
    7. Radar Images of Asteroid 2005 WK4
    8. 2005WK4 - Background
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