View source for Astronomy:(163132) 2002 CU11

{{DISPLAYTITLE:{{mp|(163132) 2002 CU|11}}}}
{{Infobox planet
| minorplanet = yes
| background = #FFC2E0
| name = {{mp|(163132) 2002 CU|11}}
| discovery_ref = <ref name="MPEC2002-C44"/>
| discoverer = [[Astronomy:Lincoln Near-Earth Asteroid Research|LINEAR]]
| discovered = 7 February 2002
| mpc_name = {{mp|(163132) 2002 CU|11}}
| mp_category = [[Astronomy:Near-Earth object|NEO]]{{·}}[[Astronomy:Potentially hazardous asteroid|PHA]]{{·}}[[Astronomy:Apollo asteroid|Apollo]]<ref name="jpldata" />
| orbit_ref = <ref name="jpldata"/>
| epoch = 13 January 2016 ([[Astronomy:Julian day|JD]] 2457400.5)
| aphelion = {{Convert|1.5795|AU|Gm|abbr=on|lk=on}}
| perihelion = {{Convert|0.85959|AU|Gm|abbr=on}}
| semimajor = {{Convert|1.2196|AU|Gm|abbr=on}}
| eccentricity = 0.29517
| period = 1.35 [[Astronomy:Julian year|yr]] (491.94 [[Astronomy:Julian year|d]])
| inclination = 48.782°
| asc_node = 157.77°
| mean_anomaly = 47.609[[Degree (angle)|°]]
| arg_peri = 110.54°
| mean_diameter = {{val|0.460|0.017}} km<ref name="jpldata"/><ref name="lcdb"/><br />{{val|0.730}} km <small>(assumed)</small><ref name="Wayback2002-03"/>
| mass = 5.3{{e|11}} kg (assumed)
| albedo = {{val|0.408|0.061}}<ref name="jpldata"/>
| magnitude = 
| abs_magnitude = 18.5<ref name="jpldata"/>
| mean_motion = {{Deg2DMS|0.73180|sup=ms}} / day (n)
| observation_arc = 4600 days (12.59 yr)
| uncertainty = 0
| moid = {{Convert|0.00189035|AU|km|abbr=on}}
}}

'''{{mp|(163132) 2002 CU|11}}''', provisional designation {{mp|2002 CU|11}}, is a bright, sub-kilometer [[Astronomy:Asteroid|asteroid]], classified as [[Astronomy:Near-Earth object|near-Earth object]] and [[Astronomy:Potentially hazardous asteroid|potentially hazardous asteroid]] of the [[Astronomy:Apollo asteroid|Apollo group]].<ref name=jpldata/> Based on [[Astronomy:Absolute magnitude#Solar System bodies (H)|absolute magnitude]], it is the second largest asteroid known to have passed closer than the Moon.<ref name=CNEOS/>

== Description ==

{{mp|2002 CU|11}} was discovered on 7 February 2002 by [[Astronomy:Lincoln Near-Earth Asteroid Research|Lincoln Near-Earth Asteroid Research]] (LINEAR) at an [[Astronomy:Apparent magnitude|apparent magnitude]] of 19 using a {{convert|1.0|m|in|adj=on|sp=us}} [[Astronomy:Reflecting telescope|reflecting telescope]].<ref name="MPEC2002-C44"/> It has an estimated diameter of {{convert|730|m|sp=us}}.<ref name="Wayback2002-03"/> The asteroid was listed on [[Astronomy:Sentry (monitoring system)|Sentry Risk Table]] with a Torino Scale rating of 1 on 20 March 2002.<ref name="Wayback2002-03"/>

With an observation arc of 44 days, {{mp|(163132) 2002 CU|11}} showed a 1 in 9,300 chance of [[Astronomy:Impact event|impacting]] Earth in 2049.<ref name="spaceguard"/> It was removed from the Sentry Risk Table on 26 April 2002.<ref name="removed"/> It is now known that on 3 September 2049 the asteroid will be {{convert|0.0843|AU|km mi|abbr=on|lk=on}} from Earth.<ref name=jpl-close/>

Even though using an [[Astronomy:Epoch|epoch]] of 27 June 2015 gives {{mp|2002 CU|11}} an Earth-[[Astronomy:Minimum orbit intersection distance|MOID]] of {{convert|0.0000093|AU|km mi|abbr=on|lk=off}},<ref name=jpldata/> the asteroid does not make any threatening approaches to Earth in the foreseeable future.

{| class="wikitable sortable" style="text-align:left"
|+Notable close-approaches to Earth<ref name=jpl-close/>
|-
! Date !! Distance from Earth 
|-
| 1925-08-30 || {{convert|0.0023|AU|km mi|abbr=on|lk=on}}
|-
| 2014-08-30 || {{convert|0.0346|AU|km mi|abbr=on|lk=off}}
|-
| 2049-09-03 || {{convert|0.0843|AU|km mi|abbr=on|lk=off}}
|-
| 2080-08-31 || {{convert|0.0042|AU|km mi|abbr=on|lk=off}}
|}

The close approach of 2080 will cause an uncertainty of 4 minutes for the close approach time of 2084.<ref name=jpl-close/>


== References ==
{{reflist|refs=

<ref name=jpldata>{{cite web
 |type=2010-08-11 last obs and [[Astronomy:Observation arc|observation arc]]=8.5 years 
 |title=JPL Small-Body Database Browser: 163132 (2002 CU11) 
 |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002CU11 
 |publisher=[[Organization:Jet Propulsion Laboratory|Jet Propulsion Laboratory]] 
 |accessdate=7 April 2016 
 |url-status=live
 |archiveurl=https://web.archive.org/web/20190528050531/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002CU11
 |archivedate=28 May 2019}}</ref>

<ref name="MPEC2002-C44">{{cite web
  |title=MPEC 2002-C44 : 2002 CU11
  |publisher=IAU Minor Planet Center
  |date=2002-02-08
  |url=https://www.minorplanetcenter.net/mpec/K02/K02C44.html
  |accessdate=2013-09-18}} (K02C11U)</ref>

<ref name="Wayback2002-03">{{cite web|date=2002-03-21 |url=http://neo.jpl.nasa.gov/risk |title=Current Impact Risks (2002 CU11) |work=Near-Earth Object Program |publisher=[[Organization:NASA|NASA]] |url-status=dead |archiveurl=https://web.archive.org/web/20020321092735/http://neo.jpl.nasa.gov/risk |archivedate=March 21, 2002 }}</ref>

<ref name="spaceguard">{{cite web
  |date=2002
  |url=http://spaceguard.rm.iasf.cnr.it/tumblingstone/issues/num12/eng/2002cu11.htm
  |title=The problem with 2002 CU11
  |author=Andrea Milani
  |author2=Giovanni Valsecchi
  |author3=Maria Eugenia Sansaturio
  |name-list-style=amp
  |publisher=Spaceguard / Tumbling Stone
  |accessdate=2013-09-18
  |archive-date=4 March 2016
  |archive-url=https://web.archive.org/web/20160304023838/http://spaceguard.rm.iasf.cnr.it/tumblingstone/issues/num12/eng/2002cu11.htm
  |url-status=dead
  }}</ref>

<ref name="removed">{{cite web
  |title=Date/Time Removed
  |publisher=NASA/JPL Near-Earth Object Program Office
  |url=http://neo.jpl.nasa.gov/risk/removed.html
  |archive-url=https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html
  |url-status=dead
  |archive-date=2002-06-02
  |accessdate=2013-09-18}}</ref>

<ref name=jpl-close>{{cite web
  |type=2010-08-11 last obs and [[Astronomy:Observation arc|observation arc]]=8.5 years
  |title=JPL Close-Approach Data: 163132 (2002 CU11)
  |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002CU11;cad=1#cad
  |accessdate=2013-09-18}}</ref>

<ref name="lcdb">{{cite web
  |title = LCDB Data for (163132) 2002 CU11 
  |publisher = Asteroid Lightcurve Database (LCDB)
  |url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=163132
  |accessdate = 16 June 2020}}</ref>

<ref name=CNEOS>[https://cneos.jpl.nasa.gov/ca/ NEO Earth Close Approaches] @ JPL CNEOS<br/>Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"</ref>

}} <!-- end of reflist -->

== External links ==
* {{NeoDys|163132}}
* {{ESA-SSA|163132|2002CU11}}
* {{JPL small body|id=163132}}

{{s-start}}
{{s-bef|before= {{mpl|(152680) 1998 KJ|9}}}}
{{s-ttl|title=Large [[Astronomy:Near-Earth object|NEO]] Earth close approach<br />(inside the orbit of the Moon)|years=30 August 1925}}
{{s-aft|after={{mpl|2002 JE|9}}}}
{{end}}

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{{DEFAULTSORT:2002 CU11}}
[[Category:Apollo asteroids|163132]]
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{{Sourceattribution|(163132) 2002 CU11}}