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2011 CQ1

{{short description|2nd closest non-impacting Earth approach}}

{{DISPLAYTITLE:{{mp|2011 CQ|1}}}}

{{Use dmy dates|date=February 2018}}

{{Infobox planet

| minorplanet = yes

| background = #FFC2E0

| name = {{mp|2011 CQ|1}}

| discovery_ref =

| discoverer = Catalina Sky Survey
Richard A. Kowalski

| discovered = 4 February 2011

| mpc_name = {{mp|2011 CQ|1}}

| mp_category = {{Hlist

| Aten

| NEO

}}

| orbit_ref =

| epoch = 13 January 2016 (JD 2457400.5)

| uncertainty = 5

| observation_arc = 12.4 hours
(35 observations used)

| aphelion = {{Convert|1.0087|AU|Gm|abbr=on|lk=on}} (Q)

| perihelion = {{Convert|0.66454|AU|Gm|abbr=on}} (q)

| semimajor = {{Convert|0.83661|AU|Gm|abbr=on}} (a)

| eccentricity = 0.20567 (e)

| period = 0.77 yr (279.5 d)

| inclination = 5.2445° (i)

| asc_node = 315.23° (Ω)

| mean_anomaly = 18.607° (M)

| arg_peri = 335.40° (ω)

| dimensions = ~{{convert|2|m|in|sp=us}}

| magnitude = 14.2 (2011 peak)

| abs_magnitude = 32.1

| mean_motion = 1.2880°/day (n)

| moid = {{Convert|0.000166307|AU|km|abbr=on}}

| jupiter_moid = {{Convert|4.09715|AU|Gm|abbr=on}}

}}

{{mp|2011 CQ|1}} is a meteoroid discovered on 4 February 2011 by Richard A. Kowalski, at the Catalina Sky Survey. On the same day the meteoroid passed within 0.85 Earth radii ({{convert|5480|km|sp=us}} of Earth's surface, and was perturbed from the Apollo class to the Aten class of near-Earth objects. With a relative velocity of only 9.7 km/s, had the asteroid passed less than 0.5 Earth radii from Earth's surface, it would have fallen as a brilliant fireball. The meteoroid is between {{convert|80|cm|in|sp=us}} and {{convert|2.6|m|in|sp=us}} wide. The meteoroid was removed from the Sentry Risk Table on 5 February 2011.

class=wikitable style="font-size: 0.9em;"
valign=top

!Parameter

!Epoch

! aphelion
(Q)

! perihelion
(q)

! Semi-major
axis
(a)

! eccentricity
(e)

! Period
(p)

! inclination
(i)

! Longitude
ascending
node
(Ω)

! Mean
anomaly
(M)

! Argument
of
perihelion
(ω)

valign=top

! Units

!

!colspan=3|AU

!

! (days)

!colspan=4| (°)

align=center

!Pre-flyby

| 2011-Jan-26

| 1.347

| 0.9096

| 1.128

| 0.1940

| 437.9

| 1.073°

| 135.4°

| 310.9°

| 58.59°

align=center

! Post-flyby

| 2011-Feb-08

| 1.009

| 0.6624

| 0.8360

| 0.2076

| 279.2

| 5.296°

| 315.4°

| 220.6°

| 335.1°

It was not until 2020 QG on 16 August 2020 that a non-impacting closer approach to Earth was observed.

{{multiple image

| align = left

| direction = horizontal

| width =

| header = Animation of 2011 CQ1's orbit - 2011 flyby

| image1 = Animation of 2011 CQ1 around Sun.gif

| caption1 = Around the Sun

| image2 = Animation of 2011 CQ1 around Earth.gif

| caption2 = Around the Earth

| footer ={{legend2| Yellow | Sun}}{{·}}{{legend2| magenta |2011 CQ1}}{{·}}{{legend2| Royalblue |Earth}}

}}

{{clear}}

See also

{{Closest non-impacting asteroids to Earth}}

References

{{reflist|refs=

{{cite web

|date=2011-02-04

|title=MPEC 2011-C12 : 2011 CQ1

|publisher=IAU Minor Planet Center

|url=http://www.minorplanetcenter.net/mpec/K11/K11C12.html

|accessdate=2013-02-27}} (K11C01Q)

{{cite web

|type=last observation: 2011-02-04; arc: 1 day

|title=JPL Close-Approach Data: (2011 CQ1)

|url=https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2011CQ1&view=OPC

|archive-url=https://web.archive.org/web/20210628080527/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011CQ1&cad=1

|archive-date=2021-06-28

|url-status=live

|access-date=31 March 2016}}

{{cite web

|title=2011 CQ1

|work=Minor Planet Center

|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=2011+CQ1

|accessdate=2020-08-21}}

{{cite web|title=Very Small Asteroid Makes Close Earth Approach on 4 February 2011 |url=http://neo.jpl.nasa.gov/news/news170.html |work=News |publisher=NASA/JPL Near-Earth Object Program Office |accessdate=18 September 2011 |author=Don Yeomans |author2=Paul Chodas |name-list-style=amp |date=4 February 2011 |url-status=dead |archiveurl=https://web.archive.org/web/20110902004227/http://neo.jpl.nasa.gov/news/news170.html |archivedate=2 September 2011 }}

{{cite web

|title=2011 CQ1 Ephemerides for 4 February 2011

|publisher=NEODyS (Near Earth Objects{{Snd}} Dynamic Site)

|url=https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2011CQ1&oc=500&y0=2011&m0=2&d0=4&h0=0&mi0=0&y1=2011&m1=2&d1=5&h1=0&mi1=0&ti=15&tiu=minutes

|accessdate=2013-02-28}}

{{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=2012-03-19}}

}}

External links

  • [https://www.space.com/10778-tiny-asteroid-passes-earth.html Tiny Asteroid Zips Close By Earth] space.com 6 February 2011
  • [https://www.newscientist.com/blogs/shortsharpscience/2011/02/asteroid-makes-sharpest-turn-y.html Asteroid makes sharpest turn yet seen in solar system] New Scientist 9 February 2011
  • [https://www.space.com/10927-asteroid-2011cq1-record-close-pass-earth.html Asteroid's Record-Breaking Brush with Earth Changed It Forever] Space.com 23 February 2011
  • {{NeoDys|2011CQ1}}
  • {{ESA-SSA|2011CQ1}}
  • {{JPL small body}}

{{Small Solar System bodies}}

{{2011 in space}}

{{Authority control}}

{{DEFAULTSORT:2011 CQ1}}

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Category:Minor planet object articles (unnumbered)

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