Trisha Shetty (Editor)

(343158) 2009 HC82

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Discovery date  29 April 2009
Observation arc  4394 days (12.03 yr)
Absolute magnitude  16.2
MPC designation  (343158) 2009 HC82
Discovered  29 April 2009
Asteroid group  Apollo asteroid
Discovered by  A. Boattini, E. C. Beshore, G. J. Garradd, A. D. Grauer, R. E. Hill, R. A. Kowalski, S. M. Larson, R. H. McNaught Catalina Sky Survey (703)
Minor planet category  Apollo, NEO, Retrograde
Aphelion  4.5665 AU (683.14 Gm) (Q)
Discoverers  Andrea Boattini, Richard Kowalski, Gordon J. Garradd, Robert H. McNaught

(343158) 2009 HC82, also written as (343158) 2009 HC82 is an Apollo near-Earth asteroid, initially listed as a potentially hazardous object. It was removed from the Sentry Risk Table on 6 May 2009. It has a retrograde orbit and makes many close approaches to Earth, Venus, and Mars at a very high relative velocity.


(343158) 2009 HC82 has a retrograde orbit and thus orbits the Sun in the opposite direction of other objects. Therefore, close approaches to this object can have very high relative velocities. As of 2012, it had the highest relative velocity to Earth of objects that come within 0.5 AU of Earth. On 11 November 2024, 2009 HC82 will pass about 0.485 AU (72,600,000 km; 45,100,000 mi) from Earth, but with a record high relative velocity of about 282,900 km/h (78.58 km/s). Both Halley's Comet (254,000 km/h) and 55P/Tempel-Tuttle (252,800 km/h) have slightly lower relative velocities to Earth.

On 2 February 2053, (343158) 2009 HC82 will pass about 0.08 AU from Venus. On 22 October 2060, it may pass about 0.004 AU (600,000 km; 370,000 mi) from Mars.

The multiple planet crossing and retrograde orbit suggests that this object may be an extinct comet or damocloid asteroid similar to 5335 Damocles, 2008 KV42, and 20461 Dioretsa.

Since the true albedo is unknown and it has an absolute magnitude (H) of 16.1, it is about 1.6 to 3.6 km in diameter.


(343158) 2009 HC82 Wikipedia