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Post Info TOPIC: Comet P/2010 A2 (LINEAR)


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RE: Comet P/2010 A2 (LINEAR)
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Astronomers would be expected to recognize comets easily when they see them, not least because of the objects' bright tails. But when planetary accidents try to fool them, their job is no longer that simple.
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Comet P/2010 A2, an Activated Asteroid from the Main Asteroid Belt

Comet-like object P/2010 A2 was discovered by the LINEAR survey on January 6, 2010. Service observations carried out using ACAM on the William Herschel Telescope on January 21, 2010, show an asteroidal nucleus detached from the dust tail. Owing to its orbital parameters and its cometary appearance, the object is classified as a main-belt comet, in other words, an activated asteroid from the main asteroid belt. Comet P/2010 A2's orbit is the nearest to the Sun known so far, for this kind of object (semi-major axis of 2.29 AU).
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Title: Water-ice driven activity on Main-Belt Comet P/2010 A2 (LINEAR) ?
Authors: F. Moreno, J. Licandro, G.-P. Tozzi, J.L. Ortiz, A. Cabrera-Lavers, T. Augusteijn, T. Liimets, J.E. Lindberg, T. Pursimo, P. Rodriguez-Gil, O. Vaduvescu

The dust ejecta of Main-Belt Comet P/2010 A2 (LINEAR) have been observed with several telescopes at the at the Observatorio del Roque de los Muchachos on La Palma, Spain. Application of an inverse dust tail Monte Carlo method to the images of the dust ejecta from the object indicates that a sustained, likely water-ice driven, activity over some eight months is the mechanism responsible for the formation of the observed tail. The total amount of dust released is estimated to be 5E7 kg, which represents about 0.3% of the nucleus mass. While the event could have been triggered by a collision, this cannot be decided from the currently available data.

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Orbital elements:
P/2010 A2 (LINEAR)
Epoch 2009 Nov. 25.0 TT = JDT 2455160.5
T 2009 Dec. 4.67084 TT MPC
q 2.0058793 (2000.0) P Q
n 0.28430088 Peri. 133.22104 -0.06300038 -0.99629454
a 2.2906070 Node 320.27856 +0.88705057 -0.02901437
e 0.1243023 Incl. 5.25682 +0.45735353 -0.08096519
P 3.47

MPEC 2010 - F16


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Orbital elements:
P/2010 A2 (LINEAR)
Epoch 2009 Nov. 25.0 TT = JDT 2455160.5
T 2009 Dec. 4.39800 TT MPC
q 2.0057959 (2000.0) P Q
n 0.28431891 Peri. 133.12101 -0.06125097 -0.99640351
a 2.2905101 Node 320.27799 +0.88709984 -0.02745593
e 0.1243017 Incl. 5.25692 +0.45749557 -0.08016368
P 3.47
From 89 observations 2010 Jan. 6-Mar. 9

MPEC 2010 - E50


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Orbital elements:
P/2010 A2 (LINEAR)
Epoch 2009 Nov. 25.0 TT = JDT 2455160.5
T 2009 Dec. 4.10957 TT MPC
q 2.0052909 (2000.0) P Q
n 0.28436727 Peri. 133.00264 -0.05932386 -0.99652195
a 2.2902504 Node 320.28565 +0.88715902 -0.02575611
e 0.1244229 Incl. 5.25495 +0.45763473 -0.07925046
P 3.47
From 92 observations 2010 Jan. 6-Mar. 5

MPEC 2010 - E18


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Posts: 131433
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Orbital elements:
P/2010 A2 (LINEAR)
Epoch 2009 Nov. 25.0 TT = JDT 2455160.5
T 2009 Dec. 4.96458 TT MPC
q 2.0051870 (2000.0) P Q
n 0.28439177 Peri. 133.30715 -0.06475376 -0.99618570
a 2.2901189 Node 320.29347 +0.88701309 -0.03060648
e 0.1244180 Incl. 5.25297 +0.45718129 -0.08171467
P 3.47
From 88 observations 2010 Jan. 6-Feb. 21

MPEC 2010 - D88


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While scientists don't think it's a comet, they're not exactly sure of the precise origin of the incredible object soaring some 90 million miles from Earth, snapped just a few weeks ago by the Hubble Space Telescope.
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Posts: 131433
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Orbital elements:
P/2010 A2 (LINEAR)
Epoch 2009 Nov. 25.0 TT = JDT 2455160.5
T 2009 Dec. 4.90081 TT MPC
q 2.0056319 (2000.0) P Q
n 0.28433447 Peri. 133.30063 -0.06442301 -0.99620440
a 2.2904266 Node 320.28084 +0.88701314 -0.03028855
e 0.1243413 Incl. 5.25578 +0.45722791 -0.08160514
P 3.47
From 87 observations 2010 Jan. 6-Feb. 19

MPEC 2010 - D64


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Posts: 131433
Date:
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Orbital elements:
P/2010 A2 (LINEAR)
Epoch 2009 Nov. 25.0 TT = JDT 2455160.5
T 2009 Dec. 3.87659 TT MPC
q 2.0079460 (2000.0) P Q
n 0.28405968 Peri. 133.01076 -0.05830992 -0.99656677
a 2.2919035 Node 320.21852 +0.88712732 -0.02472555
e 0.1238959 Incl. 5.27048 +0.45782646 -0.07901469
P 3.47
From 85 observations 2010 Jan. 6-Feb. 7

MPEC 2010 - C30


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