2009 HC82
| Discovery[1] | |
|---|---|
| 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) |
| Discovery date | 2009-04-29 |
| Designations | |
| MPC designation | 2009 HC82 |
| Minor planet category | PHA[1] Apollo[2] Retrograde orbit |
| Orbital characteristics[2] | |
| Epoch 2010-Jul-23 (JD 2455400.5) T_jup = 1.315 |
|
| Aphelion | 4.568 AU (Q) |
| Perihelion | 0.4874 AU (q) |
| Semi-major axis | 2.528 AU (a) |
| Eccentricity | 0.8071 |
| Orbital period | 4.02 yr |
| Mean anomaly | 153.72° (M) |
| Inclination | 154.51° |
| Longitude of ascending node | 294.85° |
| Argument of perihelion | 298.42° |
| Physical characteristics | |
| Dimensions | 1.6-3.6 km[2][3] |
| Apparent magnitude | ~20[1] |
| Absolute magnitude (H) | 16.1[2] |
2009 HC82, also written as 2009 HC82 is a near-Earth asteroid, initially listed as a potentially hazardous object.[1] It was removed from the Sentry Risk Table on 6 May 2009.[4] It has a retrograde orbit and makes many close approaches to Earth, Venus, and Mars at a very high relative velocity.
Velocity [edit]
2009 HC82 has a retrograde orbit and thus orbits the Sun in the opposite direction of other objects. So close-approaches to this object can have very high relative velocities. As of 2012[update], this Near-Earth object has the highest relative velocity to Earth of objects that come within 0.5 AU of the Earth.[5] On 11 November 2024, 2009 HC82 will pass about 0.485 AU (72,600,000 km; 45,100,000 mi) from the Earth, but with a record high relative velocity of about 282,900 km/h (78.58 km/s).[6] Both Halley's Comet (254,000 km/h)[7] and 55P/Tempel-Tuttle (252,800 km/h)[8] have slightly lower relative velocities to the Earth.
On 2 February 2053, 2009 HC82 will pass about 0.08 AU from Venus.[6] On 22 October 2060, it may pass about 0.004 AU (600,000 km; 370,000 mi) from Mars.[6]
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.[9]
Since the true albedo is unknown and it has an absolute magnitude (H) of 16.1,[2] it is about 1.6 to 3.6 km in diameter.[3]
References [edit]
- ^ a b c d "MPEC 2009-J04 : 2009 HC82". IAU Minor Planet Center. 2009-05-01. Retrieved 2011-02-08.
- ^ a b c d e "JPL Small-Body Database Browser: (2009 HC82)". 2010-04-04 last obs. Retrieved 2011-02-08.
- ^ a b "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06.
- ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2012-03-19.
- ^ "NEO Close-Approaches (Between 1900 and 2200)". NASA/JPL Near-Earth Object Program. Retrieved 2012-06-22. (sorted by descending relative velocity, dist<0.5AU = "215,221 close-Earth approaches")
- ^ a b c "JPL Close-Approach Data: (2009 HC82)". 2010-04-04 last obs. Retrieved 2011-02-09.
- ^ "JPL Close-Approach Data: 1P/Halley". 1994-01-11 last obs. Retrieved 2011-02-09.
- ^ "JPL Close-Approach Data: 55P/Tempel-Tuttle". 1998-07-05 last obs. Retrieved 2011-02-09.
- ^ Akimasa Nakamura and bas (2009-05-02). "List of Damocloids (Oort cloud asteroids)". Lowell Observatory. Retrieved 2011-02-09.
External links [edit]
- Orbital simulation from JPL (Java) / Horizons Ephemeris
