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Post Info TOPIC: Comet P/2010 R2 (LA SAGRA)


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Comet 324P/La Sagra
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Comet 324P/La Sagra makes its closest approach to the Earth (1.682 AU) in the constellation Aquila on the 19th July 2015



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Comet 324P/La Sagra is at Opposition (1.683 AU) on the 16th July 2015

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase   Mag
2015 07 15    19 37 13.8 -07 20 05   1.6839  2.6807   165.7     5.4  18.4
2015 07 16    19 36 16.5 -07 14 23   1.6829  2.6798   165.7     5.4  18.4
2015 07 17    19 35 19.2 -07 08 48   1.6823  2.6790   165.7     5.4  18.4
2015 07 18    19 34 22.0 -07 03 21   1.6819  2.6781   165.6     5.4  18.4
2015 07 19    19 33 25.0 -06 58 01   1.6817  2.6773   165.3     5.5  18.4
2015 07 20    19 32 28.1 -06 52 49   1.6818  2.6765   165.0     5.6  18.4
2015 07 21    19 31 31.5 -06 47 45   1.6822  2.6757   164.6     5.8  18.4
2015 07 22    19 30 35.2 -06 42 49   1.6829  2.6748   164.2     5.9  18.4
2015 07 23    19 29 39.2 -06 38 00   1.6838  2.6740   163.6     6.1  18.4
2015 07 24    19 28 43.7 -06 33 19   1.6850  2.6732   163.0     6.4  18.4
2015 07 25    19 27 48.8 -06 28 46   1.6865  2.6724   162.4     6.6  18.4
2015 07 26    19 26 54.3 -06 24 21   1.6882  2.6716   161.7     6.9  18.4
2015 07 27    19 26 00.5 -06 20 03   1.6902  2.6709   161.0     7.1  18.4
2015 07 28    19 25 07.4 -06 15 53   1.6925  2.6701   160.2     7.4  18.4
2015 07 29    19 24 15.0 -06 11 52   1.6949  2.6693   159.4     7.7  18.4
2015 07 30    19 23 23.4 -06 07 58   1.6977  2.6685   158.5     8.0  18.4
2015 07 31    19 22 32.6 -06 04 11   1.7007  2.6678   157.7     8.3  18.4


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RE: Comet P/2010 R2 (LA SAGRA)
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Comet P/2010 R2 (La Sagra) makes its closest approach to the Earth (2.364 AU) on the 25th April 2014



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Comet P/2010 R2 (La Sagra) is at Opposition (2.371 AU) on the 18th April 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase   Mag
2014 04 18    12 59 11.6 -35 58 36   2.3711  3.2962   152.8     8.0  20.1
2014 04 19    12 58 22.4 -35 51 54   2.3694  3.2949   152.8     8.0  20.1
2014 04 20    12 57 33.8 -35 45 00   2.3679  3.2937   152.8     8.0  20.0
2014 04 21    12 56 45.7 -35 37 55   2.3666  3.2924   152.8     8.0  20.0
2014 04 22    12 55 58.2 -35 30 38   2.3657  3.2911   152.7     8.1  20.0
2014 04 23    12 55 11.3 -35 23 10   2.3650  3.2898   152.5     8.1  20.0
2014 04 24    12 54 25.0 -35 15 32   2.3645  3.2885   152.3     8.2  20.0
2014 04 25    12 53 39.5 -35 07 44   2.3643  3.2872   152.1     8.2  20.0
2014 04 26    12 52 54.8 -34 59 46   2.3644  3.2859   151.8     8.3  20.0
2014 04 27    12 52 10.9 -34 51 38   2.3647  3.2846   151.5     8.4  20.0
2014 04 28    12 51 27.9 -34 43 22   2.3653  3.2833   151.2     8.5  20.0
2014 04 29    12 50 45.7 -34 34 57   2.3662  3.2820   150.8     8.6  20.0
2014 04 30    12 50 04.5 -34 26 25   2.3673  3.2807   150.4     8.7  20.0


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Title: Observational and Dynamical Characterisation of Main-Belt Comet P/2010 R2 (La Sagra)
Authors: Henry H. Hsieh, Bin Yang, Nader Haghighipour, Bojan Novakovic, Robert Jedicke, Richard J. Wainscoat, Larry Denneau, Shinsuke Abe, Wen-Ping Chen, Alan Fitzsimmons, Mikael Granvik, Tommy Grav, Wing Ip, Heather M. Kaluna, Daisuke Kino****a, Jan Kleyna, Matthew M. Knight, Pedro Lacerda, Carey M. Lisse, Eric Maclennan, Karen J. Meech, Marco Micheli, Andrea Milani, Jana Pittichova, Eva Schunova, David J. Tholen, Lawrence H. Wasserman, William S. Burgett, K. C. Chambers, Jim N. Heasley, N. Kaiser, Eugene A. Magnier, Jeffrey S. Morgan, Paul A. Price, Uffe G. Jorgensen, Martin Dominik, Tobias Hinse, Kailash Sahu, Colin Snodgrass

We present observations of the recently discovered comet-like main-belt object P/2010 R2 (La Sagra) obtained by Pan-STARRS 1 and the Faulkes Telescope-North on Haleakala in Hawaii, the University of Hawaii 2.2 m, Gemini-North, and Keck I telescopes on Mauna Kea, the Danish 1.54 m telescope (operated by the MINDSTEp consortium) at La Silla, and the Isaac Newton Telescope on La Palma. An antisolar dust tail is observed to be present from August 2010 through February 2011, while a dust trail aligned with the object's orbit plane is also observed from December 2010 through August 2011. Assuming typical phase darkening behaviour, P/La Sagra is seen to increase in brightness by >1 mag between August 2010 and December 2010, suggesting that dust production is ongoing over this period. These results strongly suggest that the observed activity is cometary in nature (i.e., driven by the sublimation of volatile material), and that P/La Sagra is therefore the most recent main-belt comet to be discovered. We find an approximate absolute magnitude for the nucleus of H_R = 17.90.2 mag, corresponding to a nucleus radius of ~0.7 km, assuming an albedo of p=0.05. Using optical spectroscopy to search for CN emission, we do not detect any conclusive evidence of sublimation products (i.e., gas emission), finding CN and H2O production rates of Q_CN<3x10^23 s^-1 and Q_H2O<10^26 s^-1, respectively. Numerical simulations indicate that P/La Sagra is dynamically stable for > 100 Myr, suggesting that it is likely native to its current location and that its composition is likely representative of other objects in the same region of the main belt, though the relatively close proximity of the 13:6 mean-motion resonance with Jupiter and the (3,-2,-1) three-body mean-motion resonance with Jupiter and Saturn mean that dynamical instability on larger timescales cannot be ruled out.

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Orbital elements:
P/2010 R2 (La Sagra)
Epoch 2010 June 13.0 TT = JDT 2455360.5
T 2010 June 25.64894 TT MPC
q 2.6226253 (2000.0) P Q
n 0.18073039 Peri. 59.49963 +0.80889279 +0.46108409
a 3.0982415 Node 270.76015 -0.58090456 +0.72254878
e 0.1535117 Incl. 21.39851 +0.09078738 +0.51509680
P 5.45

MPEC 2010 - U33


Comet P/2010 R2 (LA SAGRA) was discovered by the La Sagra Sky Survey (LSSS).
The orbital elements of the comet indicate a perihelion passage on the 25th June, 2010, at a distance of 2.6 AU from the Sun, and an orbital period of 5.45 years.

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DISCOVERY OF P/2010 R2 (LA SAGRA) AND THE HIGH-SPEED RAIL

Hello, we would like this time to share the circumstances of this new comet discovery of La Sagra Sky Survey (LSSS), to let friends and observers around to know how do we usually observe in our amateur sky survey and which things happen sometimes.
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Orbital elements:
P/2010 R2 (La Sagra)
T 2010 June 25.0979 TT MPC
q 2.622922 (2000.0) P Q
n 0.1806143 Peri. 59.3696 +0.8078131 +0.4629648
a 3.099569 Node 270.7569 -0.5825876 +0.7212030
e 0.153778 Incl. 21.3991 +0.0896084 +0.5152959
P 5.46
From 87 observations 2010 Aug. 12-Sept. 19.

MPEC 2010 - S28


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