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2020 CW

Topic: Astronomy

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Short description: Near-Earth asteroid
2020 CW
Discovery [1]
Discovered byMLS
Discovery siteMount Lemon Obs.
Discovery date1 February 2020
(first observed only)
Designations
2020 CW
Minor planet categoryNEO · Apollo [1][2]
Orbital characteristics [2]
Epoch 1 February 2020 (JD 2458880.5)
Uncertainty parameter 8[2] · —[1]
Observation arc0 day
|{{{apsis}}}|helion}}1.9980 AU
|{{{apsis}}}|helion}}0.4769 AU
1.2375 AU
Eccentricity0.6146
Orbital period1.38 yr (503 d)
Mean anomaly322.21°
Mean motion0° 42m 57.6s / day
Inclination2.1259°
Longitude of ascending node132.01°
110.66°
Earth MOID0.030 LD (0.000076 AU)
Physical characteristics
Mean diameter1.1 m (est at 0.14)[3][4]
Absolute magnitude (H)32.5[1][2] 32.6[4]


2020 CW is a tiny near-Earth asteroid of the Apollo group, approximately 1 meter (3 ft) in diameter. It was first observed by the Mount Lemmon Survey on 1 February 2020,[1] when it passed Earth very closely at a nominal distance of only 0.041 lunar distances (0.000105 astronomical units).[2] The object's orbital elements remain highly uncertain.[1][2]

Description

2020 CW passed within 15,660 kilometres (9,730 mi) of the Earth on 1 February 2020, with a fly-by speed of 21.2 kilometres (13.2 mi) per second.[2] The household-appliance-sized asteroid passed within the orbit of satellites in the geostationary ring at 35,900 kilometres (22,300 mi) above Earth's equator.[5] At the time, it was the closest approach in the year 2020. Since then, 2020 JJ made a closer approach on 4 May 2020.[6]

The asteroid was first observed 1 February 2020 by the Mount Lemmon Survey at Mount Lemmon Observatory in the Santa Catalina Mountains northeast of Tucson, Arizona.[1] The next encounter closer than the Moon is predicted to occur 5 February 2029 at a distance of 19,040 kilometres (11,830 mi) or more.[2]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "2020 CW". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2020+CW. Retrieved 5 September 2020. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "JPL Small-Body Database Browser: (2020 CW)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3989456;cad=1#cad. Retrieved 5 September 2020. 
  3. ↑ "Asteroid Size Estimator". CNEOS NASA/JPL. https://cneos.jpl.nasa.gov/tools/ast_size_est.html. Retrieved 5 September 2020. 
  4. ↑ 4.0 4.1 "ESA space situational awareness 2020CW". European Space Agency. http://neo.ssa.esa.int/search-for-asteroids?tab=summary&des=2020CW. 
  5. ↑ Mack, Eric (4 February 2020). "Adorable asteroid 2020 CW makes one of the closest passes by Earth ever seen". CNET. https://www.cnet.com/news/adorable-asteroid-2020-cw-makes-one-of-the-closest-passes-by-earth-ever-seen/. "It was a harmless flyby for the record books." 
  6. ↑ "NEO Earth Close Approaches". Center for Near Earth Object Studies (CNEOS). https://cneos.jpl.nasa.gov/ca/. "Table Settings: All available data, Nominal dist. <= 1LD, no H limit, sort by CA Distance Nominal" 



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