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Post Info TOPIC: Centaur (10199) Chariklo


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RE: Centaur (10199) Chariklo
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(10199) Chariklo / 2UCAC 18533636 event on 2017 Jun 22, 21:17 UT

On 2017 June 22 21:17 UT, the 249 km diameter asteroid (10199) Chariklo will occult a 14.6 mag star in the constellation Sagittarius

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Chariklo220617



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Title: The structure of Chariklo's rings from stellar occultations
Author: D. Bérard, B. Sicardy, J.I.B. Camargo, J. Desmars, F. Braga-Ribas, J.L. Ortiz, R. Duffard, N. Morales, E. Meza, R. Leiva Espinoza, G. Benedetti-Rossi, M. Assafin, R. Vieira-Martins, F. Colas, J.L. Dauvergne, P. Kervella, J. Lecacheux, L. Maquet, F. Vachier, A.A. Sickafoose, H. Breytenbach, A. Genade, W. Beisker, K.L. Bath, H.J. Bode, V.D. Ivanov, E. Jehin, J. Pollock, G. Tancredi, S. Roland, R. Salvo, L. Vanzi, D. Herald, D. Gault, S. Kerr, H. Pavlov, K.M. Hill, J. Bradshaw, M.A. Barry, A. Cool, B. Lade, A. Cole, B. Giles, J. Broughton, J. Newman, R. Horvart, D. Maybour, D. Giles, L. Davis, R.A. Paton, B. Loader, A. Pennell, P.D. Jaquiery, S. Brillant, F. Selman, C. Dumas, C. Herrera, G. Carraro, L. Monaco, A. Maury, A. Peyrot, J.P. Teng, A. Richichi, P. Irawati, C. De Witt, P. Schoenau, et al. (13 additional authors not shown)

Two narrow and dense rings (called C1R and C2R) were discovered around the Centaur object (10199) Chariklo during a stellar occultation observed on June 3, 2013 (Braga-Ribas et al. 2014). Following this discovery, we have planned observations of several occultations by Chariklo's system in order to better characterize the ring and main body physical properties. Here, we use 12 successful Chariklo's occultations observed between 2014 and 2016. They provide ring profiles (physical width, opacity, edge structure) and constraints on their radii and pole position. Our new observations are currently consistent with the circular ring solution and pole position, to within the ± 3.3 km formal uncertainty for the ring radii, derived by Braga-Ribas et al. (2014). The six resolved C1R profiles reveal significant width variations from ~ 5.5 to 7 km. The width of the fainter ring C2R is less constrained, and may vary between 0.1 and 1 km. The inner and outer edges of C1R are consistent with infinitely sharp boundaries, with typical upper limits of one kilometer for the transition zone between the ring and empty space. No constraint on the sharpness of C2R's edges is available. A 1 sigma upper limit of ~ 20 m is derived for the equivalent width of narrow (physical width < 4 km) rings up to distances of 12,000 km, counted in the ring plane.

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Title: The Dynamical History of Chariklo and its Rings
Author: Jeremy Wood, Jonti Horner, Tobias C. Hinse, Stephen C. Marsden

Chariklo is the only small Solar system body confirmed to have rings. Given the instability of its orbit, the presence of rings is surprising, and their origin remains poorly understood. In this work, we study the dynamical history of the Chariklo system by integrating almost 36,000 Chariklo clones backwards in time for one Gyr under the influence of the Sun and the four giant planets. By recording all close encounters between the clones and planets, we investigate the likelihood that Chariklo's rings could have survived since its capture to the Centaur population. Our results reveal that Chariklo's orbit occupies a region of stable chaos, resulting in its orbit being marginally more stable than those of the other Centaurs. Despite this, we find that it was most likely captured to the Centaur population within the last 20 Myr, and that its orbital evolution has been continually punctuated by regular close encounters with the giant planets. The great majority (> 99%) of those encounters within one Hill radius of the planet have only a small effect on the rings. We conclude that close encounters with giant planets have not had a significant effect on the ring structure. Encounters within the Roche limit of the giant planets are rare, making ring creation through tidal disruption unlikely.

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(10199) Chariklo / UCAC4-294-211208 event on 2017 Apr 09, 02:25 UT

On 2017 Apr 09 UT, the 249 km diameter asteroid (10199) Chariklo will occult a 14.9 mag star in the constellation Sagittarius

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Chariklo090417



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10199 Chariklo (1997 CU26)
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On 2017 Mar 10 UT, the 258 km diameter asteroid (10199) Chariklo will occult a 13.0 mag star in the constellation Sagittarius for observers along a path across Australia.

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Chariklo100317



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Centaur (10199) Chariklo (1997 CU26) is at Opposition (14.105 AU) in the constellation Sagittarius on the 22nd June 2015 

Ephemeris

Date       UT      R.A. (J2000) Decl.    Delta     r     El.    Ph.   Mag
2015 06 21 000000 17 59 29.6 -36 44 01  14.104  15.095  166.7   0.9  18.4
2015 06 22 000000 17 59 14.1 -36 43 39  14.105  15.096  166.7   0.9  18.4
2015 06 23 000000 17 58 58.6 -36 43 16  14.106  15.096  166.7   0.9  18.4
2015 06 24 000000 17 58 43.1 -36 42 51  14.107  15.097  166.5   0.9  18.4
2015 06 25 000000 17 58 27.7 -36 42 26  14.108  15.098  166.3   0.9  18.4
2015 06 26 000000 17 58 12.2 -36 41 59  14.110  15.099  166.1   0.9  18.4
2015 06 27 000000 17 57 56.8 -36 41 31  14.112  15.099  165.8   0.9  18.4
2015 06 28 000000 17 57 41.5 -36 41 03  14.114  15.100  165.4   1.0  18.4
2015 06 29 000000 17 57 26.2 -36 40 33  14.117  15.101  164.9   1.0  18.4
2015 06 30 000000 17 57 11.0 -36 40 02  14.120  15.102  164.4   1.0  18.4


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Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2014 06 01    17 32 10.4 -38 55 53  13.8552 14.8066   159.0     1.4    18.4
2014 06 02    17 31 54.9 -38 55 38  13.8520 14.8073   159.7     1.4    18.3
2014 06 03    17 31 39.4 -38 55 22  13.8491 14.8081   160.3     1.3    18.3
2014 06 04    17 31 23.7 -38 55 05  13.8464 14.8088   160.9     1.3    18.3
2014 06 05    17 31 08.0 -38 54 47  13.8441 14.8095   161.5     1.2    18.3
2014 06 06    17 30 52.3 -38 54 27  13.8420 14.8103   162.0     1.2    18.3
2014 06 07    17 30 36.4 -38 54 06  13.8402 14.8110   162.5     1.2    18.3
2014 06 08    17 30 20.6 -38 53 44  13.8387 14.8118   162.9     1.2    18.3
2014 06 09    17 30 04.7 -38 53 20  13.8375 14.8125   163.3     1.1    18.3
2014 06 10    17 29 48.8 -38 52 55  13.8365 14.8132   163.6     1.1    18.3
2014 06 11    17 29 32.8 -38 52 29  13.8359 14.8140   163.9     1.1    18.3
2014 06 12    17 29 16.8 -38 52 02  13.8355 14.8147   164.1     1.1    18.3
2014 06 13    17 29 00.8 -38 51 33  13.8354 14.8155   164.3     1.1    18.3
2014 06 14    17 28 44.9 -38 51 03  13.8356 14.8162   164.4     1.1    18.3
2014 06 15    17 28 28.9 -38 50 32  13.8361 14.8170   164.4     1.1    18.3
2014 06 16    17 28 12.9 -38 49 59  13.8368 14.8177   164.4     1.1    18.3
2014 06 17    17 27 57.0 -38 49 25  13.8379 14.8184   164.3     1.1    18.3
2014 06 18    17 27 41.0 -38 48 50  13.8392 14.8192   164.2     1.1    18.3
2014 06 19    17 27 25.1 -38 48 13  13.8408 14.8199   163.9     1.1    18.3
2014 06 20    17 27 09.3 -38 47 36  13.8428 14.8207   163.7     1.1    18.3
2014 06 21    17 26 53.4 -38 46 57  13.8449 14.8214   163.4     1.1    18.3
2014 06 22    17 26 37.7 -38 46 17  13.8474 14.8221   163.0     1.2    18.3
2014 06 23    17 26 22.0 -38 45 35  13.8502 14.8229   162.6     1.2    18.3
2014 06 24    17 26 06.3 -38 44 53  13.8532 14.8236   162.1     1.2    18.3
2014 06 25    17 25 50.8 -38 44 09  13.8566 14.8244   161.6     1.2    18.3
2014 06 26    17 25 35.3 -38 43 24  13.8602 14.8251   161.0     1.3    18.3
2014 06 27    17 25 19.9 -38 42 38  13.8641 14.8259   160.4     1.3    18.3
2014 06 28    17 25 04.6 -38 41 51  13.8683 14.8266   159.8     1.4    18.4
2014 06 29    17 24 49.4 -38 41 02  13.8727 14.8273   159.2     1.4    18.4
2014 06 30    17 24 34.3 -38 40 13  13.8774 14.8281   158.5     1.4    18.4


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On 2015 May 8th, Centaur (10199) Chariklo will occult a 14.3 mag star in the constellation Sagittarius for observers along a path across the South Pacific

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(10199) Chariklo / UCAC4-267-153296 event

On 2015 April 24, Centaur (10199) Chariklo will occult a 14.3 mag star in the constellation Sagittarius for observers in the South Pacific.

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Centaur (10199) Chariklo is at Opposition (13.836 AU) on the 15th June 2014

Ephemeris

Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     Mag
2014 06 14    17 28 44.9 -38 51 03  13.8356 14.8162   164.4     1.1    18.3
2014 06 15    17 28 28.9 -38 50 32  13.8361 14.8170   164.4     1.1    18.3
2014 06 16    17 28 12.9 -38 49 59  13.8368 14.8177   164.4     1.1    18.3
2014 06 17    17 27 57.0 -38 49 25  13.8379 14.8184   164.3     1.1    18.3
2014 06 18    17 27 41.0 -38 48 50  13.8392 14.8192   164.2     1.1    18.3
2014 06 19    17 27 25.1 -38 48 13  13.8408 14.8199   163.9     1.1    18.3
2014 06 20    17 27 09.3 -38 47 36  13.8428 14.8207   163.7     1.1    18.3
2014 06 21    17 26 53.4 -38 46 57  13.8449 14.8214   163.4     1.1    18.3
2014 06 22    17 26 37.7 -38 46 17  13.8474 14.8221   163.0     1.2    18.3
2014 06 23    17 26 22.0 -38 45 35  13.8502 14.8229   162.6     1.2    18.3
2014 06 24    17 26 06.3 -38 44 53  13.8532 14.8236   162.1     1.2    18.3
2014 06 25    17 25 50.8 -38 44 09  13.8566 14.8244   161.6     1.2    18.3
2014 06 26    17 25 35.3 -38 43 24  13.8602 14.8251   161.0     1.3    18.3
2014 06 27    17 25 19.9 -38 42 38  13.8641 14.8259   160.4     1.3    18.3
2014 06 28    17 25 04.6 -38 41 51  13.8683 14.8266   159.8     1.4    18.4
2014 06 29    17 24 49.4 -38 41 02  13.8727 14.8273   159.2     1.4    18.4
2014 06 30    17 24 34.3 -38 40 13  13.8774 14.8281   158.5     1.4    18.4
2014 07 01    17 24 19.4 -38 39 22  13.8825 14.8288   157.8     1.5    18.4


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