P/2010 A2

The main belt comet discovered in 2010

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Comet P/2010 A2 (LINEAR) is one of the small objects in the solar system with both comet and asteroid characteristics. Therefore, the name of comet was given at the beginning. Later, its orbit was confirmed to be in the main belt of asteroids, and it had a comet like tail, so it was classified as the main belt comet. Analysis from Hubble Space Telescope Its tail is composed of dry dust and gravel generated by collision with other asteroids, rather than being generated from cometary ice sublimation. The position of the core obviously deviates to one side, not on the axis of the tail, and outside the dust halo, which is a phenomenon never seen on its comet in the future. The tail is made up of millimeter sized particles, so it will be pushed away by the solar radiation pressure.

Foreign name: P/2010 A2

Date of discovery: January 6, 2010

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The orbital position of Comet P/2010A2 when it was discovered was on January 6, 2010 Lincoln Near-Earth Asteroid Research (LINEAR) 1 meter (36 inch) Reflecting telescope It was discovered by assembling a CCD camera. It was observed for 26 days, and the orbital period was estimated to be about 3.5 years from the arc length. Precise orbital details need to be refined to more accurately simulate the orbit. It passed through the perihelion (closest to the sun) in early December 2009, about a month before its discovery. Since the aphelion (the farthest from the sun) is only 2.6 AU, P/2010A2 has been located inside the frozen line of 2.7 AU throughout its life. Volatile ice is common on the inside of the freezing line. Although the composition of gas or water vapor has not been detected, it is still not ruled out that the tail of P/2010A2 can be formed from the sublimation of ice hidden under the crust. The diameter of P/2010A2 is about 150 meters (460 feet), but it was suspected that its diameter was not more than 500 meters when it was first discovered. Another celestial body, the centaur 60558 Echeclus, discovered in 2006, is also suspected to have become an uncertain fission event as a result of gas release. The orbit of P/2010A2 is consistent with the members of the Huashen Star Family, which was generated by the debris collided about 100 million years ago. It may be the K/T impactor who caused the extinction of dinosaurs, or it may be from the Huashen Star Family.

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<b>P/2010 A2 (LINEAR)</b>
main-belt comets P/2010 A2 is up to 8 cents in the image taken by the 24 "telescope
find	—
Discoverer	LINEAR ( seven hundred and four )
Date of discovery	2010-01-06
number	—
minor planet category	comet asteroid main-belt comets
Track parameters	—
Epoch January 14, 2010
Apohelion	two point five seven AU (Q)
Perihelion	2.00 AU (q)
Semimajor axis	2.29 AU (a)
Eccentricity	zero point one two
Orbital period	three point four seven yr
Angle of plane approach	11.4° (M)
Rail inclination	five point two six °
Ascending Node Yellow Meridian	320°
Perihelion parameters	133°
Physical characteristics	—
size	~140m（460ft）
Albedo	unknown
Apparent magnitude	~18-20
Absolute magnitude (H)	21.3±0.6

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