astro.wikisort.org - Asteroid2005 HC4 is the asteroid with the smallest known perihelion of any known object orbiting the Sun (except sungrazing comets). Its extreme orbital eccentricity brings it to within 0.071 AU of the Sun (23% of Mercury's perihelion) and takes it as far as 3.562 AU from the Sun (well beyond the orbit of Mars). Due to its very small perihelion and comparably large aphelion, 2005 HC4 achieves the fastest speed of any known asteroid bound to the Solar System with a velocity of 157 km/s (565,000 km/h; 351,000 mi/h) at perihelion[4] (there are comets, however, which obtain much higher speeds).
Asteroid
2005 HC4 |
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Discovered by | LONEOS |
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Discovery date | 30 April 2005 |
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Minor planet category | |
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Epoch 3 May 2005 (JD 2453493.5) |
Uncertainty parameter 9 |
Aphelion | 3.5707 AU (534.17 Gm) |
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Perihelion | 0.070657 AU (10.5701 Gm) |
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Semi-major axis | 1.8207 AU (272.37 Gm) |
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Eccentricity | 0.96119 |
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Orbital period (sidereal) | 2.46 yr (897.30 d) |
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Mean anomaly | 341.42° |
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Mean motion | 0° 24m 4.32s /day |
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Inclination | 8.3967° |
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Longitude of ascending node | 63.790° |
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Argument of perihelion | 309.01° |
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Earth MOID | 0.0615074 AU (9.20138 Gm) |
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Jupiter MOID | 1.92798 AU (288.422 Gm) |
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Dimensions | 210–480 m[3] |
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Absolute magnitude (H) | 20.7 |
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See also
References
- "MPEC 2005-J02 : 2005 HC4". IAU Minor Planet Center. 1 May 2005. Retrieved 5 March 2014. (K05H04C)
- "JPL Small-Body Database Browser: (2005 HC4)" (2005-05-11 last obs (arc=11 days)). Jet Propulsion Laboratory. Retrieved 30 March 2016.
- "NEODyS 2005 HC4". Near Earth Objects – Dynamic Site. Retrieved 7 March 2014.
- As calculated with the vis-viva-equation :
where:
- v is the relative speed of the two bodies
- r is the distance between the two bodies
- a is the semi-major axis (a > 0 for ellipses, a = ∞ or 1/a = 0 for parabolas, and a < 0 for hyperbolas)
- G is the gravitational constant
- M is the mass of the central body
External links
Small Solar System bodies |
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Comets |
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Other |
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На других языках
- [en] 2005 HC4
[ru] 2005 HC4
2005 HC4 — небольшой околоземный астероид из группы Аполлонов, который интересен самым малым известным значением перигелия (подходит к Солнцу в пять раз ближе Меркурия) и чрезвычайно вытянутой орбитой, проходящей через всю внутреннюю часть Солнечной системы.
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