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

Abstract

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.{sup 0}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 and 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.{sup 0}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= 0.033 {+-} 0.{sup 0}071 in longitude, it exhibits a significant radialmore » 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{sup -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.« less

Authors:
; ; ; ; ;  [1];  [2];  [3];  [4];  [5];  [6]; ; ;  [7];  [8];  [9];  [10];  [11];  [12];  [13]
  1. Observatoire de Paris, LESIA, 5, Place Jules Janssen, 92195 Meudon Cedex (France)
  2. Craigie, 295 Camberwarra Drive, West Australia 6025 (Australia)
  3. Reedy Creek, 18 Branch Crescent, Queensland 4227 (Australia)
  4. Bankstown, 115 Oxford Avenue, Sydney 2200, New South Wales (Australia)
  5. International Occultation Timing Association (IOTA) and Western Sydney Amateur Astronomy Group (WSAAG), Sydney, New South Wales (Australia)
  6. Astronomical Association of Queensland and RASNZ Occultation Section, Glenlee, Queensland (Australia)
  7. Association Astronomique de La Reunion (AAR), La Reunion Island (France)
  8. Euraster, 1B Cours J. Bouchard, 42000 St-Etienne (France)
  9. IOTA/ES, Bartold-Knaust-Strasse 8, D-30459 Hannover (Germany)
  10. SAAO, P.O. Box 9, Observatory 7935, Republic of South Africa (South Africa)
  11. Observatoire de Paris, IMCCE, 61 Avenue de l'Observatoire, 75014 Paris (France)
  12. Springbok, Northern Cape, Republic of South Africa (South Africa)
  13. Internationale Amateur Sternwarte (IAS), Hakos (Namibia)
Publication Date:
OSTI Identifier:
21583229
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 141; Journal Issue: 2; Other Information: DOI: 10.1088/0004-6256/141/2/67; Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ECLIPSE; IMAGES; PLUTO PLANET; SATELLITES; STARS; TELESCOPES; PLANETS

Citation Formats

Sicardy, B, Lecacheux, J, Boissel, Y, Doressoundiram, A, Roques, F, Widemann, T, Bolt, G, Broughton, J, Dobosz, T, Gault, D, Kerr, S, Benard, F, Peyrot, A, Teng-Chuen-Yu, J -P, Frappa, E, Beisker, W, Buckley, D, Colas, F, De Witt, C, and Gruhn, C. CONSTRAINTS ON CHARON'S ORBITAL ELEMENTS FROM THE DOUBLE STELLAR OCCULTATION OF 2008 JUNE 22. United States: N. p., 2011. Web. doi:10.1088/0004-6256/141/2/67.
Sicardy, B, Lecacheux, J, Boissel, Y, Doressoundiram, A, Roques, F, Widemann, T, Bolt, G, Broughton, J, Dobosz, T, Gault, D, Kerr, S, Benard, F, Peyrot, A, Teng-Chuen-Yu, J -P, Frappa, E, Beisker, W, Buckley, D, Colas, F, De Witt, C, & Gruhn, C. CONSTRAINTS ON CHARON'S ORBITAL ELEMENTS FROM THE DOUBLE STELLAR OCCULTATION OF 2008 JUNE 22. United States. doi:10.1088/0004-6256/141/2/67.
Sicardy, B, Lecacheux, J, Boissel, Y, Doressoundiram, A, Roques, F, Widemann, T, Bolt, G, Broughton, J, Dobosz, T, Gault, D, Kerr, S, Benard, F, Peyrot, A, Teng-Chuen-Yu, J -P, Frappa, E, Beisker, W, Buckley, D, Colas, F, De Witt, C, and Gruhn, C. Tue . "CONSTRAINTS ON CHARON'S ORBITAL ELEMENTS FROM THE DOUBLE STELLAR OCCULTATION OF 2008 JUNE 22". United States. doi:10.1088/0004-6256/141/2/67.
@article{osti_21583229,
title = {CONSTRAINTS ON CHARON'S ORBITAL ELEMENTS FROM THE DOUBLE STELLAR OCCULTATION OF 2008 JUNE 22},
author = {Sicardy, B and Lecacheux, J and Boissel, Y and Doressoundiram, A and Roques, F and Widemann, T and Bolt, G and Broughton, J and Dobosz, T and Gault, D and Kerr, S and Benard, F and Peyrot, A and Teng-Chuen-Yu, J -P and Frappa, E and Beisker, W and Buckley, D and Colas, F and De Witt, C and Gruhn, C},
abstractNote = {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.{sup 0}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 and 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.{sup 0}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= 0.033 {+-} 0.{sup 0}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{sup -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.},
doi = {10.1088/0004-6256/141/2/67},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 2,
volume = 141,
place = {United States},
year = {2011},
month = {2}
}