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2011 CQ₁

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2011 CQ₁
Discovery^[1]
Discovered by	Catalina Sky Survey Richard A. Kowalski
Discovery date	4 February 2011
Designations
MPC designation	2011 CQ₁
Minor planet category	Aten NEO^[2]
Orbital characteristics^[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter5
Observation arc	12.4 hours^[3] (35 observations used)
Aphelion	1.0087 AU (150.90 Gm) (Q)
Perihelion	0.66454 AU (99.414 Gm) (q)
Semi-major axis	0.83661 AU (125.155 Gm) (a)
Eccentricity	0.20567 (e)
Orbital period (sidereal)	0.77 yr (279.5 d)
Mean anomaly	18.607° (M)
Mean motion	1.2880°/day (n)
Inclination	5.2445° (i)
Longitude of ascending node	315.23° (Ω)
Argument of perihelion	335.40° (ω)
Earth MOID	0.000166307 AU (24,879.2 km)
Jupiter MOID	4.09715 AU (612.925 Gm)
Physical characteristics
Dimensions	~2 meters (79 in)
Apparent magnitude	14.2 (2011 peak)^[4]
Absolute magnitude (H)	32.1^[2]

2011 CQ₁ is a meteoroid discovered on 4 February 2011 by Richard A. Kowalski, at the Catalina Sky Survey.^[1] On the same day the meteoroid passed within 0.85 Earth radii (5,480 kilometers (3,410 mi)) of Earth's surface, and was perturbed from the Apollo class to the Aten class of near-Earth objects.^[5] With a relative velocity of only 9.7 km/s,^[2] 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 80 centimeters (31 in) and 2.6 meters (100 in) wide.^[5] The meteoroid was removed from the Sentry Risk Table on 5 February 2011.^[6]

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)
Units		AU				(days)	(°)
Pre-flyby	2011-Jan-26	1.347	0.9096	1.128	0.1940	437.9	1.073°	135.4°	310.9°	58.59°
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.

Animation of 2011 CQ1's orbit - 2011 flyby

Around the Sun

Around the Earth

Sun · 2011 CQ1 · Earth

Closest non-impacting asteroids to Earth, except Earth-grazing fireballs
(using JPL SBDB numbers and Earth radius of 6,378 km)
Asteroid	Date	Distance from surface of Earth	Uncertainty in approach distance	Observation arc	Reference
2020 VT4	2020-11-13 17:21	368 km	±11 km	5 days (34 obs)	data
2020 QG	2020-08-16 04:09	2939 km	±11 km	2 days (35 obs)	data
2021 UA1	2021-10-25 03:07	3049 km	±10 km	1 day (22 obs)	data
2023 BU	2023-01-27 00:29	3589 km	±<1 km	10 days (231 obs)	data
2011 CQ1	2011-02-04 19:39	5474 km	±5 km	1 day (35 obs)	data
2019 UN13	2019-10-31 14:45	6235 km	±189 km	1 day (16 obs)	data
2008 TS26	2008-10-09 03:30	6260 km	±970 km	1 day (19 obs)	data
2004 FU162	2004-03-31 15:35	6535 km	±13000 km	1 day (4 obs)	data

References[edit]

^ ^a ^b "MPEC 2011-C12 : 2011 CQ1". IAU Minor Planet Center. 4 February 2011. Retrieved 27 February 2013. (K11C01Q)

^ ^a ^b ^c ^d "JPL Close-Approach Data: (2011 CQ1)" (last observation: 2011-02-04; arc: 1 day). Archived from the original on 28 June 2021. Retrieved 31 March 2016.

^ "2011 CQ1". Minor Planet Center. Retrieved 21 August 2020.

^ "2011 CQ1 Ephemerides for 4 February 2011". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 28 February 2013.

^ ^a ^b Don Yeomans & Paul Chodas (4 February 2011). "Very Small Asteroid Makes Close Earth Approach on 4 February 2011". News. NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 September 2011. Retrieved 18 September 2011.

^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Archived from the original on 2 June 2002. Retrieved 19 March 2012.

External links[edit]

Tiny Asteroid Zips Close By Earth space.com 6 February 2011
Asteroid makes sharpest turn yet seen in solar system New Scientist 9 February 2011
Asteroid's Record-Breaking Brush with Earth Changed It Forever Space.com 23 February 2011
2011 CQ1atNeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
2011 CQ1atESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
2011 CQ1 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

Small Solar System bodies

Other

v t e 2011 in space
2012 »
Space probe launches	Juno (Jupiter orbiter; Aug 2011) GRAIL (mission to the Moon; Sep 2011) Yinghuo-1 (Mars orbiter); Nov 2011) Mars Science Laboratory / Curiosity rover (mission to Mars; Nov 2011) Fobos-Grunt (mission to Mars; Nov 2011)
Selected NEOs	Asteroid close approaches (367789) 2011 AG5 (471240) 2011 BT15 2011 CQ1 2011 ES4 2011 EO40 2011 GA 2009 BD 2011 MD (415029) 2011 UL21 (436724) 2011 UW158 (308635) 2005 YU55 (549948) 2011 WL2 2011 XC2
Exoplanets	82 G. Eridani b c d Gliese 433 b habitability of Gliese 581d Gliese 3634 b HAT-P-32b HAT-P-33b HD 7199 HD 82886 b HD 85512 b HD 98219 b HD 100655 b HD 131496 b HD 137388 b HIP 57274 b c d HR 7722 c Kepler-9d Kepler-10 b c Kepler-11 b c d e f g Kepler-14b Kepler-16b Kepler-18 b c d Kepler-20 b c d e f Kepler-22b Kepler-39b Kepler-70 b c LkCa 15 b MOA-2009-BLG-387Lb PSR J1719−1438 b WASP-39b WASP-43b WASP-44b
Discoveries	UDFj-39546284 Swift J1644+57 Kronberger 61 WD 0806−661 ULAS J1120+0641 Kerberos (moon) PSR J1719−1438 Uranus trojan 2011 QF99 U1.11 SDSS J102915+172927 2moons of Jupiter GRB 111209A
Novae	SN 2010lt SN 2011by SN 2011dh SN 2011fe
Comets	P/2011 NO₁ (Elenin) 45P/Honda–Mrkos–Pajdušáková C/2011 W3 (Lovejoy)
Space exploration	MESSENGER (Mercury orbital insertion; Apr 2011) Spirit (end of mission; Mar 2010 / May 2011) Dawn (Vesta orbital insertion; Jul 2011)
Outer space portal Category:2010 in outer space — Category:2011 in outer space — Category:2012 in outer space

Retrieved from "https://en.wikipedia.org/w/index.php?title=2011_CQ1&oldid=1199276657" Categories: ●Aten asteroids ●Minor planet object articles (unnumbered) ●Near-Earth objects removed from the Sentry Risk Table ●Near-Earth objects in 2011 ●Astronomical objects discovered in 2011 Hidden categories: ●Articles with short description ●Short description is different from Wikidata ●Use dmy dates from February 2018 ●Articles with JPL SBDB identifiers ●Articles with MPC identifiers ●This page was last edited on 26 January 2024, at 17:18 (UTC). ●Text is available under the Creative Commons Attribution-ShareAlike License 4.0; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. ●Privacy policy ●About Wikipedia ●Disclaimers ●Contact Wikipedia ●Code of Conduct ●Developers ●Statistics ●Cookie statement ●Mobile view