2010
DOI: 10.1088/2041-8205/718/2/l132
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Water-Ice-Driven Activity on Main-Belt Comet P/2010 A2 (Linear)?

Abstract: 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 5×10 7 kg, which represents about… Show more

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Cited by 29 publications
(54 citation statements)
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“…Using the formalism of Agarwal et al (2007), the dust size distribution inferred from the surface brightness profile along the tail is a power law in the a = 1-20 mm range, with a number of particles proportional to a n (differential size distribution), with n = −3.44 ± 0.08. This value is in agreement with that modeled in the previous section, and with those reported by Moreno et al (2010), n = −3.4 ± 0.3, Jewitt et al (2010), n = −3.3 ± 0.2 and Snodgrass et al (2010), n = −3.5. A value close to -3.5 is significant because this is in agreement with the empirical value for the distribution of particle sizes resulting from a collision, and for a collisionally relaxed population (Dohnanyi 1969).…”
Section: Quantity Of Dust In the Tailsupporting
confidence: 93%
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“…Using the formalism of Agarwal et al (2007), the dust size distribution inferred from the surface brightness profile along the tail is a power law in the a = 1-20 mm range, with a number of particles proportional to a n (differential size distribution), with n = −3.44 ± 0.08. This value is in agreement with that modeled in the previous section, and with those reported by Moreno et al (2010), n = −3.4 ± 0.3, Jewitt et al (2010), n = −3.3 ± 0.2 and Snodgrass et al (2010), n = −3.5. A value close to -3.5 is significant because this is in agreement with the empirical value for the distribution of particle sizes resulting from a collision, and for a collisionally relaxed population (Dohnanyi 1969).…”
Section: Quantity Of Dust In the Tailsupporting
confidence: 93%
“…The formal uncertainty on this value is completely dominated by the assumption of the albedo and phase correction, and certainly includes a variation caused by the rotation of the nucleus. This is in agreement with the radius of 58-77 m reported by Jewitt et al (2010) using p = 0.15 (which would convert to 68-90 m with p = 0.11), and is marginally compatible with the r = 110 ± 20 m from Moreno et al (2010).…”
Section: Measurementssupporting
confidence: 90%
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“…The position angle of the tail and its variation with time are consistent with the action of radiation pressure on millimeter-to centimeter-sized dust particles, following impulsive ejection at very low speeds (∼0.2 m s −1 ) in 2009 February-March (Jewitt et al 2010b;Snodgrass et al 2010). (Note that an opposite conclusion was reached by Moreno et al 2010 but based on limited data.) P/2010 A2 went unnoticed for its first ∼9 months largely because of its angular proximity to the Sun (Jewitt et al 2011a).…”
Section: Observations Of Active Asteroidssupporting
confidence: 57%