(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]

    (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

    Notes

    1. 1 2 3 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 2 3 4 "JPL Small-Body Database Browser: 277475 (2005 WK4)" (2014-08-12 last obs.). Jet Propulsion Laboratory. Retrieved 20 January 2018.
    2. 1 2 3 "277475 (2005 WK4)". Minor Planet Center. Retrieved 20 January 2018.
    3. 1 2 3 4 5 "LCDB Data for (277475)". Asteroid Lightcurve Database (LCDB). Retrieved 20 January 2018.
    4. 1 2 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. 1 2 3 4 5 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. Retrieved 20 January 2018.
    7. 1 2 "Radar Images of Asteroid 2005 WK4". NASA. Archived from the original on 24 September 2021.
    8. ↑ 2005WK4 - Background
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