343158 Marsyas
| 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 | 29 April 2009 |
| Designations | |
| (343158) 2009 HC82 | |
| Apollo, NEO,[2] Retrograde | |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 1 | |
| Observation arc | 4394 days (12.03 yr) |
| Aphelion | 4.5665 AU (683.14 Gm) (Q) |
| Perihelion | 0.48904 AU (73.159 Gm) (q) |
| 2.5278 AU (378.15 Gm) (a) | |
| Eccentricity | 0.80653 (e) |
| 4.02 yr (1467.9 d) | |
| 284.23° (M) | |
| 0° 14m 42.864s / day (n) | |
| Inclination | 154.40° (i) |
| 295.20° (Ω) | |
| 298.71° (ω) | |
| Earth MOID | 0.146217 AU (21.8738 Gm) |
| Jupiter MOID | 1.91679 AU (286.748 Gm) |
| TJupiter | 1.315 |
| Physical characteristics | |
| Dimensions | 1.6–3.6 km[2][3] |
| ~20[1] | |
| 16.2[2] | |
(343158) 2009 HC82, also written as (343158) 2009 HC82 is an Apollo near-Earth asteroid,[2] 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
(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[update], it had the highest relative velocity to Earth of objects that come within 0.5 AU of Earth.[5] 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).[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 Earth.
On 2 February 2053, (343158) 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
- ^ a b c "MPEC 2009-J04 : 2009 HC82". IAU Minor Planet Center. 2009-05-01. Retrieved 2011-02-08.
- ^ a b c d e f "JPL Small-Body Database Browser: (2009 HC82)" (last observation: 2010-04-04). Retrieved 8 April 2016.
- ^ a b "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 26 November 2009. Retrieved 2009-12-06.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "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)" (last observation: 2010-04-04). Retrieved 2011-02-09.
- ^ "JPL Close-Approach Data: 1P/Halley" (last observation: 1994-01-11). Retrieved 2011-02-09.
- ^ "JPL Close-Approach Data: 55P/Tempel-Tuttle" (last observation: 1998-07-05). 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
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 2009 news images (hohmanntransfer)
- 343158 Marsyas at the JPL Small-Body Database