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Post Info TOPIC: Comet 209P/LINEAR (2004 CB)

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Date:
 RE: Comet 209P/LINEAR (2004 CB) Permalink Title: When Comets Get Old: A Synthesis of Comet and Meteor Observations of the Low Activity Comet 209P/LINEAR Author: Quan-Zhi Ye, Man-To Hui, Peter G. Brown, Margaret D. Campbell-Brown, Petr Pokorný, Paul A. Wiegert, Xing Gao It is speculated that some weakly active comets may be transitional objects between active and dormant comets. These objects are at a unique stage of the evolution of cometary nuclei, as they are still identifiable as active comets, in contrast to inactive comets that are observationally indistinguishable from low albedo asteroids. In this paper, we present a synthesis of comet and meteor observations of Jupiter-family comet 209P/LINEAR, one of the most weakly active comets recorded to-date. Images taken by the Xingming 0.35-m telescope and the Gemini Flamingo-2 camera are modelled by a Monte Carlo dust model, which yields a low dust ejection speed (1/10 of that of moderately active comets), dominance of large dust grains, and a low dust production of 0.4 kg s-1 at 19~d after the 2014 perihelion passage. We also find a reddish nucleus of 209P/LINEAR that is similar to D-type asteroids and most Trojan asteroids. Meteor observations with the Canadian Meteor Orbit Radar (CMOR), coupled with meteoroid stream modelling, suggest a low dust production of the parent over the past few hundred orbits, although there are hints of a some temporary increase in activity in the 18th century. Dynamical simulations indicate 209P/LINEAR may have resided in a stable near-Earth orbit for ~104~yr, which is significantly longer than typical JFCs. All these lines of evidence imply that 209P/LINEAR as an aging comet quietly exhausting its remaining near surface volatiles. We also compare 209P/LINEAR to other low activity comets, where evidence for a diversity of the origin of low activity is seen. Read more (1158kb, PDF) __________________

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Posts: 129960
Date:
 Comet 209P/LINEAR Permalink Comet 209P/LINEAR will make a close pass (21.6 lunar distances, 0.0555 AU), travelling at 16.97 km/second, to the Earth-Moon system on the 29th May 2014 @ 07:51 UT ±00:01.See more The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).EphemerisDate TT R. A. (2000) Decl. Delta r Elong. Phase Mag 2014 05 28 10 38 01.9 +05 43 24 0.05695 1.0174 92.5 84.3 2014 05 29 10 46 11.3 -03 57 14 0.05555 1.0218 97.0 79.9 2014 05 30 10 54 44.6 -13 49 19 0.05585 1.0263 101.5 75.4 2014 05 31 11 03 43.2 -23 17 06 0.05782 1.0310 105.7 71.2 2014 06 01 11 13 08.1 -31 52 22 0.06130 1.0358 109.3 67.5 2014 06 02 11 23 00.1 -39 20 39 0.06606 1.0408 112.1 64.5 2014 06 03 11 33 19.7 -45 40 04 0.07184 1.0459 114.4 62.0 2014 06 04 11 44 06.9 -50 56 18 0.07842 1.0512 116.1 60.1 2014 06 05 11 55 21.1 -55 18 05 0.08562 1.0567 117.4 58.5 2014 06 06 12 07 01.2 -58 54 25 0.09329 1.0623 118.4 57.1 2014 06 07 12 19 05.5 -61 53 25 0.1013 1.0680 119.3 56.0 2014 06 08 12 31 31.3 -64 21 48 0.1097 1.0739 119.9 55.0 2014 06 09 12 44 15.4 -66 25 06 0.1182 1.0798 120.5 54.1 2014 06 10 12 57 13.7 -68 07 40 0.1269 1.0860 121.0 53.3 2014 06 11 13 10 21.7 -69 33 03 0.1358 1.0922 121.4 52.5 2014 06 12 13 23 34.5 -70 44 02 0.1448 1.0986 121.8 51.8 2014 06 13 13 36 46.6 -71 42 55 0.1539 1.1050 122.1 51.1 2014 06 14 13 49 52.8 -72 31 32 0.1631 1.1116 122.4 50.5 2014 06 15 14 02 48.0 -73 11 25 0.1724 1.1183 122.7 49.8 2014 06 16 14 15 27.5 -73 43 50 0.1818 1.1251 123.0 49.2 2014 06 17 14 27 47.1 -74 09 50 0.1911 1.1320 123.3 48.6 2014 06 18 14 39 43.4 -74 30 19 0.2006 1.1391 123.5 48.0 2014 06 19 14 51 13.5 -74 46 02 0.2101 1.1462 123.8 47.5 2014 06 20 15 02 15.6 -74 57 38 0.2196 1.1534 124.0 46.9 2014 06 21 15 12 48.2 -75 05 41 0.2292 1.1606 124.2 46.4 2014 06 22 15 22 50.9 -75 10 39 0.2389 1.1680 124.4 45.9 2014 06 23 15 32 23.4 -75 12 56 0.2485 1.1755 124.6 45.4 2014 06 24 15 41 26.2 -75 12 52 0.2582 1.1830 124.8 44.8 2014 06 25 15 50 00.1 -75 10 47 0.2680 1.1906 125.0 44.4 2014 06 26 15 58 05.9 -75 06 55 0.2778 1.1983 125.2 43.9 2014 06 27 16 05 45.0 -75 01 29 0.2876 1.2061 125.4 43.4 2014 06 28 16 12 58.6 -74 54 42 0.2975 1.2140 125.6 42.9 2014 06 29 16 19 48.3 -74 46 42 0.3074 1.2219 125.7 42.5 2014 06 30 16 26 15.4 -74 37 39 0.3173 1.2298 125.9 42.0On 29 May 2014 the comet will pass 0.0554 AU (8,290,000 km; 5,150,000 mi) from Earth, but is only expected to brighten to about apparent magnitude 11.Read more __________________

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Date:
 Camelopardalids meteor shower Permalink Update:The Camelopardalids meteor shower peak is predicted for 07:40 UT, 24th May 2014  __________________

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Posts: 129960
Date:
 Permalink Camelopardalids meteor shower peak predicted for 07:00 UT, 24th May 2014  __________________

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Posts: 129960
Date:
 RE: Comet 209P/LINEAR (2004 CB) Permalink Step outside and take a look at the skies on the evening of May 23 into the early morning of May 24. Scientists are anticipating a new meteor shower, the May Camelopardalids. No one has seen it before, but the shower could put on a show that would rival the prolific Perseid meteor shower in August. The Camelopardalids shower would be dust resulting from a periodic comet, 209P/LINEAR. Read more __________________

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Date:
 Camelopardalids Permalink Stargazers in Oman may be treated with a rare meteor showers on May 23 night as Earth passes through the tail of a comet. Speaking to Times of Oman, Mohammed Yahya Al Hijri, resident-foreign affairs, Oman Astronomical Society, said residents can see as many as 1,000 shooting stars per hour between 10pm and 5am. Read more __________________

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Date:
 RE: Comet 209P/LINEAR (2004 CB) Permalink The Birth of a Meteor ShowerBecause of the way the comet (first discovered in 2004) and its orbit were oriented, it (and the dusty debris surrounding it) didnt come close to Earth. But this year will different; in 2012, it passed close by to Jupiter, which changed its orbit slightly. For the first time in history, this comet will pass within just 5 million miles (8 million km) of Earth on May 29th. Along with it, its expected that a large fraction of the dusty debris in that elliptical orbit will pass near Earth as wellRead more __________________

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Posts: 129960
Date:
 Comet 209P/LINEAR Permalink Comet 209P/LINEAR is at Perihelion (0.969 AU) on the 6th May 2014 EphemerisDate TT R. A. (2000) Decl. Delta r Elong. Phase Mag 2014 05 05 08 33 23.1 +67 00 19 0.2384 0.9696 73.9 92.5 2014 05 06 08 37 29.6 +66 31 50 0.2296 0.9695 73.7 93.2 2014 05 07 08 41 40.0 +66 00 42 0.2207 0.9695 73.5 93.9 2014 05 08 08 45 54.6 +65 26 34 0.2118 0.9698 73.3 94.6 2014 05 09 08 50 13.6 +64 49 01 0.2029 0.9702 73.1 95.3 2014 05 10 08 54 37.2 +64 07 35 0.1939 0.9709 73.0 96.0 2014 05 11 08 59 05.7 +63 21 42 0.1850 0.9718 72.9 96.6 2014 05 12 09 03 39.4 +62 30 40 0.1760 0.9729 72.9 97.2 2014 05 13 09 08 18.7 +61 33 40 0.1671 0.9742 72.8 97.7 2014 05 14 09 13 04.2 +60 29 42 0.1582 0.9757 72.9 98.2 2014 05 15 09 17 56.3 +59 17 31 0.1493 0.9774 72.9 98.7 __________________

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Posts: 129960
Date:
 Permalink Comet 209P/LINEAR is at Opposition (0.949 AU) on the 5th January 2014  __________________

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Posts: 129960
Date:
 Permalink Title: Will Comet 209P/LINEAR Generate the Next Meteor Storm? Authors: Quanzhi Ye, Paul A. Wiegert Previous studies have suggested that Comet 209P/LINEAR may produce strong meteor activity on Earth on 2014 May 24; however, exact timing and activity level is difficult to estimate due to the limited physical observations of the comet. Here we re-analyse the optical observations of 209P/LINEAR obtained during its 2009 apparition. We find that the comet is relatively depleted in dust production, with Af {rho} at 1 cm level within eight months around its perihelion. This feature suggested that this comet may be currently transitioning from typical comet to a dormant comet. Syndyne simulation shows that the optical cometary tail is dominated by larger particles with {\beta} ~ 0.003. Numerical simulations of the cometary dust trails confirm the arrival of particles on 2014 May 24 from some of the 1798-1979 trails. The nominal radiant is at RA 122 ± 1 deg, Dec 79 ± 1 deg (J2000) in the constellation of Camelopardalis. Given that the comet is found to be depleted in dust production, we concluded that a meteor storm (ZHR>=1000) may be unlikely. However, our simulation also shows that the size distribution of the arrived particles is skewed strongly to larger particles. Coupling with the result of syndyne simulation, we think that the event, if detectable, may be dominated by bright meteors. We encourage observers to monitor the expected meteor event as it will provide us with rare direct information on the dynamical history of 209P/LINEAR which is otherwise irretrievably lost. Read more (454kb, PDF) __________________
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