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- 2011_UL21 apoapsis "5.247893304156E8".
- 2011_UL21 mass "2.1".
- 2011_UL21 orbitalPeriod "1128.6225".
- 2011_UL21 periapsis "1.1008907304813E8".
- 2011_UL21 absoluteMagnitude "15.8".
- 2011_UL21 abstract "2011 UL21 is an Apollo class potentially hazardous asteroid (PHA) discovered on October 17, 2011 by the Catalina Sky Survey project. The asteroid is estimated to have a diameter of 2.5 km. It was rated at Torino Scale 1 on October 27, 2011 with an observation arc of 9.6 days. 2011 UL21 briefly had about a 1 in a million chance of impacting in 2029. Its cumulative impact probability was dropped to 1 in 71 million by 2 November 2011 with an observation arc of 15 days. It was removed from the Sentry Risk Table on 4 November 2011. Palomar Observatory precovery images from 1989 and 1990 have extended the observation arc to 22 years. Its next notable close approach to the Earth will be on June 27, 2024 at a distance of 0.044 AU (6,600,000 km; 4,100,000 mi).With an absolute magnitude (H) of 15.8, it is potentially the largest/brightest potentially hazardous asteroid detected since (242450) 2004 QY2. The next largest PHA (based on absolute magnitude) discovered in 2011 is 2011 WO41 with an absolute magnitude of 16.8.".
- 2011_UL21 apoapsis "5.247893304156E11".
- 2011_UL21 discovered "2011-10-17".
- 2011_UL21 discoverer Catalina_Sky_Survey.
- 2011_UL21 epoch "(Uncertainty=0)".
- 2011_UL21 epoch "2012-Mar-14".
- 2011_UL21 mass "2100.0".
- 2011_UL21 orbitalPeriod "9.751298399999999E7".
- 2011_UL21 periapsis "1.1008907304813E11".
- 2011_UL21 wikiPageID "33564900".
- 2011_UL21 wikiPageRevisionID "571803827".
- 2011_UL21 absMagnitude "15.8".
- 2011_UL21 aphelion "3.508".
- 2011_UL21 argPeri "284.7".
- 2011_UL21 ascNode "275.6".
- 2011_UL21 bgcolour "#FFFFC0".
- 2011_UL21 dimensions "~2500 meters".
- 2011_UL21 discovered "2011-10-17".
- 2011_UL21 discoverer Catalina_Sky_Survey.
- 2011_UL21 discoverer "0.68".
- 2011_UL21 discovery "yes".
- 2011_UL21 eccentricity "0.6532".
- 2011_UL21 epoch "2012".
- 2011_UL21 hasPhotoCollection 2011_UL21.
- 2011_UL21 inclination "34.84".
- 2011_UL21 mass "2.1".
- 2011_UL21 meanAnomaly "23.77".
- 2011_UL21 mpCategory List_of_Apollo_asteroids.
- 2011_UL21 mpCategory Near-Earth_object.
- 2011_UL21 mpCategory Potentially_hazardous_object.
- 2011_UL21 perihelion "0.7359".
- 2011_UL21 period "9.751298399999999E7".
- 2011_UL21 physicalCharacteristics "yes".
- 2011_UL21 semimajor "2.122".
- 2011_UL21 width "25".
- 2011_UL21 subject Category:Apollo_asteroids.
- 2011_UL21 subject Category:Astronomical_objects_discovered_in_2011.
- 2011_UL21 subject Category:Near-Earth_asteroids.
- 2011_UL21 subject Category:Removed_from_Sentry_Risk_Table.
- 2011_UL21 type CelestialBody.
- 2011_UL21 type Planet.
- 2011_UL21 type PhysicalBody.
- 2011_UL21 comment "2011 UL21 is an Apollo class potentially hazardous asteroid (PHA) discovered on October 17, 2011 by the Catalina Sky Survey project. The asteroid is estimated to have a diameter of 2.5 km. It was rated at Torino Scale 1 on October 27, 2011 with an observation arc of 9.6 days. 2011 UL21 briefly had about a 1 in a million chance of impacting in 2029. Its cumulative impact probability was dropped to 1 in 71 million by 2 November 2011 with an observation arc of 15 days.".
- 2011_UL21 label "2011 UL21".
- 2011_UL21 label "2011 UL21".
- 2011_UL21 sameAs 2011_UL21.
- 2011_UL21 sameAs 2011_UL21.
- 2011_UL21 sameAs m.0hgn19m.
- 2011_UL21 sameAs Q4622750.
- 2011_UL21 sameAs Q4622750.
- 2011_UL21 wasDerivedFrom 2011_UL21?oldid=571803827.
- 2011_UL21 isPrimaryTopicOf 2011_UL21.