CONSTRAINTS ON CHARON'S ORBITAL ELEMENTS FROM THE DOUBLE STELLAR OCCULTATION OF 2008 JUNE 22

被引：20

作者：

Sicardy, B. ^{[1
,2
,3
]}

Bolt, G.

Broughton, J.

Dobosz, T.

Gault, D. ^{[4
,5
]}

Kerr, S. ^{[6
,7
]}

Benard, F. ^{[8
]}

Frappa, E. ^{[9
]}

Lecacheux, J. ^{[1
]}

Peyrot, A. ^{[8
]}

Teng-Chuen-Yu, J. -P. ^{[8
]}

Beisker, W. ^{[10
]}

Boissel, Y. ^{[1
]}

Buckley, D. ^{[11
]}

Colas, F. ^{[12
]}

de Witt, C.

Doressoundiram, A. ^{[1
]}

Roques, F. ^{[1
]}

Widemann, T. ^{[1
]}

Gruhn, C. ^{[13
]}

Batista, V. ^{[14
]}

Biggs, J. ^{[15
]}

Dieters, S. ^{[16
]}

Greenhill, J. ^{[16
]}

Groom, R. ^{[17
]}

Herald, D. ^{[18
,19
]}

Lade, B.

Mathers, S. ^{[20
]}

Assafin, M. ^{[21
]}

Camargo, J. I. B. ^{[21
,22
]}

Vieira-Martins, R. ^{[22
]}

Andrei, A. H. ^{[22
]}

da Silva Neto, D. N. ^{[23
]}

Braga-Ribas, F. ^{[1
,22
]}

Behrend, R. ^{[24
]}

机构：

[1] Observ Paris, LESIA, F-92195 Meudon, France

[2] Univ Paris 06, F-75005 Paris, France

[3] Inst Univ France, F-75005 Paris, France

[4] IOTA, Sydney, NSW, Australia

[5] WSAAG, Sydney, NSW, Australia

[6] Astron Assoc Queensland, Glenlee, Qld, Australia

[7] RASNZ Occultat Sect, Glenlee, Qld, Australia

[8] Assoc Astron La Reunion AAR, La Reunion Isl, France

[9] Euraster, F-42000 St Etienne, France

[10] IOTA ES, D-30459 Hannover, Germany

[11] SAAO, ZA-7935 Observatory, South Africa

[12] Observ Paris, IMCCE, F-75014 Paris, France

[13] IAS, Hakos, Namibia

[14] Inst Astrophys Paris, F-75014 Paris, France

[15] Perth Observ, Bickley, WA 6076, Australia

[16] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia

[17] Astron Soc Western Australia, Perth, WA 6904, Australia

[18] Canberra Astron Soc, Canberra, ACT, Australia

[19] IOTA, Canberra, ACT, Australia

[20] Univ Tasmania, So Cross Observ, Hobart, Tas 7001, Australia

[21] Observ Valongo UFRJ, BR-20080090 Rio De Janeiro, Brazil

[22] Observ Nacl MCT, BR-20921400 Rio De Janeiro, Brazil

[23] Ctr Univ Estadual Zona Oeste, BR-23070200 Rio De Janeiro, Brazil

[24] Observ Geneva, CH-1290 Sauverny, Switzerland

来源：

ASTRONOMICAL JOURNAL | 2011年 / 141卷 / 02期

关键词：

astrometry; Kuiper belt objects: individual (Pluto; Charon); occultations; planets and satellites: fundamental parameters; PLUTOS ATMOSPHERE; UPPER LIMIT; RADIUS; METHANE; SURFACE; NIX;

D O I：

10.1088/0004-6256/141/2/67

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Pluto and its main satellite, Charon, occulted the same star on 2008 June 22. This event was observed from Australia and La Reunion Island, providing the east and north Charon Plutocentric offset in the sky plane (J2000): X = + 12,070.5 +/- 4 km (+ 546.2 +/- 0.2 mas), Y = + 4,576.3 +/- 24 km (+ 207.1 +/- 1.1 mas) at 19:20:33.82 UT on Earth, corresponding to JD 2454640.129964 at Pluto. This yields Charon's true longitude L = 153.483 +/- 0 degrees.071 in the satellite orbital plane (counted from the ascending node on J2000 mean equator) and orbital radius r = 19,564 +/- 14 km at that time. We compare this position to that predicted by (1) the orbital solution of Tholen & Buie (the "TB97" solution), (2) the PLU017 Charon ephemeris, and (3) the solution of Tholen et al. (the "T08" solution). We conclude that (1) our result rules out solution TB97, (2) our position agrees with PLU017, with differences of Delta L = + 0.073 +/- 0 degrees.071 in longitude, and Delta r = + 0.6 +/- 14 km in radius, and (3) while the difference with the T08 ephemeris amounts to only Delta L = 0.073 +/- 0 degrees.071 in longitude, it exhibits a significant radial discrepancy of Delta r = 61.3 +/- 14 km. We discuss this difference in terms of a possible image scale relative error of 3.35 x 10(-3) in the 2002-2003 Hubble Space Telescope images upon which the T08 solution is mostly based. Rescaling the T08 Charon semi-major axis, a = 19, 570.45 km, to the TB97 value, a=19636 km, all other orbital elements remaining the same ("T08/TB97" solution), we reconcile our position with the re-scaled solution by better than 12 km (or 0.55 mas) for Charon's position in its orbital plane, thus making T08/TB97 our preferred solution.

引用

页数：16

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