2020 CW

{{Short description|Near-Earth asteroid}} {{Use dmy dates|date=August 2020}} {{Infobox planet | minorplanet = yes | name = 2020 CW | background = #FFC2E0 | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = [[Mount Lemmon Survey|MLS]] | discovery_site = [[Mount Lemmon Observatory|Mount Lemon Obs.]] | discovered = 1 February 2020<br />{{small|(first observed only)}} | mpc_name = 2020 CW | alt_names = | pronounced = | named_after = | mp_category = [[Near-Earth object|NEO]]{{·}}[[List of Apollo asteroids|Apollo]]<ref name="MPC-object" /><ref name="jpldata" /> | orbit_ref = <ref name="jpldata" /> | epoch = 1 February 2020 ([[Julian day|JD]] 2458880.5) | uncertainty = 8<ref name="jpldata" />{{·}}—<ref name="MPC-object" /> | observation_arc = 0 day | aphelion = 1.9980 [[Astronomical unit|AU]] | perihelion = 0.4769 AU | semimajor = 1.2375 AU | eccentricity = 0.6146 | period = 1.38 [[Julian year (astronomy)|yr]] (503 d) | mean_anomaly = 322.21[[Degree (angle)|°]] | mean_motion = {{Deg2DMS|0.7160|sup=ms}} / day | inclination = 2.1259° | asc_node = 132.01° | arg_peri = 110.66° | moid = {{convert|0.000076|AU|LD|abbr=on|lk=in|order=flip}} | mean_diameter = {{val|1.1|ul=m}} {{small|(est at [[Geometric albedo|0.14]])}}<ref name="h" /><ref name="ssa_072920"/> | rotation = | albedo = | spectral_type = | abs_magnitude = 32.5<ref name="MPC-object" /><ref name="jpldata" /> 32.6<ref name="ssa_072920"/> }}

'''{{mp|2020 CW}}''' is a tiny [[Near-Earth Object|near-Earth asteroid]] of the [[Apollo asteroid|Apollo group]], approximately {{convert|1|m|ft|sigfig=1|sp=us}} in diameter. It was first observed by the [[Mount Lemmon Survey]] on 1 February 2020,<ref name="MPC-object" /> when it passed Earth very closely at a nominal distance of only {{convert|0.000105|AU|LD|abbr=off|lk=on|order=flip}}.<ref name="jpldata" /> The object's [[orbital elements]] remain [[Uncertainty parameter|highly uncertain]].<ref name="MPC-object" /><ref name="jpldata" />

== Description ==

{{mp|2020 CW}} passed within {{convert|9730|mi|km|order=flip}} of the Earth on 1 February 2020, with a fly-by speed of {{convert|13.2|mi|km|order=flip}} per second.<ref name="jpldata"/> The household-appliance-sized asteroid passed within the orbit of satellites in the [[geostationary ring]] at {{convert|22300|mi|km|order=flip}} above Earth's equator.<ref name="cnet_020420"/> At the time, it was the closest approach in the year 2020. Since then, {{mpl|2020 JJ}} made a closer approach on 4 May 2020.<ref name="CNEOS" />

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.<ref name="MPC-object" /> The next encounter closer than the [[Moon]] is predicted to occur 5 February 2029 at a distance of {{convert|11830|mi|km|order=flip}} or more.<ref name="jpldata" />

== References == {{reflist|30em|refs=

<ref name="jpldata">{{cite web |type = 2020-02-01 last obs. |title = JPL Small-Body Database Browser: (2020 CW) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3989456;cad=1#cad |publisher = [[Jet Propulsion Laboratory]] |accessdate = 5 September 2020}}</ref>

<ref name="MPC-object">{{cite web |title = 2020 CW |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2020+CW |accessdate = 5 September 2020}}</ref>

<ref name="cnet_020420">{{cite news |last = Mack |first=Eric |title = Adorable asteroid 2020 CW makes one of the closest passes by Earth ever seen |url = https://www.cnet.com/news/adorable-asteroid-2020-cw-makes-one-of-the-closest-passes-by-earth-ever-seen/ |newspaper = [[CNET]] |date = 4 February 2020 |quote = It was a harmless flyby for the record books.}}</ref>

<ref name="ssa_072920">{{cite web |title = ESA space situational awareness 2020CW |url = http://neo.ssa.esa.int/search-for-asteroids?tab=summary&des=2020CW |publisher = [[European Space Agency]] |access-date= 29 July 2020}}</ref>

<ref name="CNEOS">{{cite web |title = NEO Earth Close Approaches |url = https://cneos.jpl.nasa.gov/ca/ |publisher = Center for Near Earth Object Studies (CNEOS) |access-date= 29 July 2020 |quote = Table Settings: All available data, Nominal dist. <= 1LD, no H limit, sort by CA Distance Nominal}}</ref>

<ref name="h">{{cite web |title = Asteroid Size Estimator |publisher = CNEOS NASA/JPL |url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html |accessdate = 5 September 2020}}</ref>

}}

== External links == * [https://www.minorplanetcenter.net/iau/lists/t_apollos.html List Of Apollo Minor Planets (by designation)], ''Minor Planet Center'' * {{NeoDys|2020CW}} * {{ESA-SSA|2020CW}} * {{JPL small body|id=3989456}}

{{Small Solar System bodies|state=expanded}}  {{2020 in space}} {{Authority control}}

{{DEFAULTSORT:2020 CW}} [[Category:Apollo asteroids|#]] [[Category:Minor planet object articles (unnumbered)]] [[Category:Discoveries by MLS]] [[Category:Near-Earth objects in 2020|20200201]] [[Category:Astronomical objects discovered in 2020|20200201]]