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Contents

   



(Top)
 


1 Description  



1.1  Physical characteristics  







2 See also  





3 Notes  





4 References  





5 External links  














(277475) 2005 WK4






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(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

MPC designation

(277475) 2005 WK4

Alternative designations

2005 WK4

Minor planet category

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

Semi-major axis

1.0106 AU
Eccentricity0.2374

Orbital period (sidereal)

1.02 yr (371 days)

Mean anomaly

81.040°

Mean motion

0° 58m 12.36s / day
Inclination9.8433°

Longitude of ascending node

138.14°

Argument of perihelion

74.063°
Earth MOID0.0037 AU · 1.4 LD
Physical characteristics
Dimensions0.25±0.05km[a]
0.284 km (calculated)[3]

Synodic rotation period

2.595±0.002 h[4]
2.7±0.1h[a]
2.73±0.05h[5]

Geometric albedo

0.20 (assumed)[3]

Spectral type

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 SurveyatSiding Spring Observatory, Australia.[2]

Description[edit]

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[edit]

2005 WK4 measures approximately 250 meters in diameter, and has a rotation period of 2.595 hours.[3][4][a] 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[edit]

Notes[edit]

  1. ^ a b c 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[edit]

  1. ^ a b c d "JPL Small-Body Database Browser: 277475 (2005 WK4)" (2014-08-12 last obs.). Jet Propulsion Laboratory. Retrieved 20 January 2018.
  • ^ a b c "277475 (2005 WK4)". Minor Planet Center. Retrieved 20 January 2018.
  • ^ a b c d e "LCDB Data for (277475)". Asteroid Lightcurve Database (LCDB). Retrieved 20 January 2018.
  • ^ a b 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.
  • ^ Behrend, Raoul. "Asteroids and comets rotation curves – (277475)". Geneva Observatory. Retrieved 20 January 2018.
  • ^ a b c d e 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.
  • ^ a b "Radar Images of Asteroid 2005 WK4". NASA. Archived from the original on 24 September 2021.
  • ^ 2005WK4 - Background
  • External links[edit]


    Retrieved from "https://en.wikipedia.org/w/index.php?title=(277475)_2005_WK4&oldid=1229660203"

    Categories: 
    Minor planet object articles (numbered)
    Apollo asteroids
    Discoveries by SSS
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    Near-Earth objects in 2013
    Astronomical objects discovered in 2005
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