Study of the Plutino Object (208996) 2003 AZ84 from Stellar Occultations: Size, Shape, and Topographic Features

被引：33

作者：

Dias-Oliveira, A. ^{[1
]}

Sicardy, B. ^{[2
]}

Ortiz, J. L. ^{[3
]}

Braga-Ribas, F. ^{[1
,4
]}

Leiva, R. ^{[2
,5
]}

Vieira-Martins, R. ^{[1
,6
,7
]}

Benedetti-Rossi, G. ^{[1
]}

Camargo, J. I. B. ^{[1
,7
]}

Assafin, M. ^{[8
]}

Gomes-Junior, A. R. ^{[8
]}

Baug, T. ^{[9
]}

Chandrasekhar, T. ^{[9
]}

Desmars, J. ^{[2
]}

Duffard, R. ^{[3
]}

Santos-Sanz, P. ^{[3
]}

Ergang, Z. ^{[10
]}

Ganesh, S. ^{[9
]}

Ikari, Y. ^{[11
]}

Irawati, P. ^{[12
]}

Jain, J. ^{[9
]}

Liying, Z. ^{[10
]}

Richichi, A. ^{[12
]}

Shengbang, Q. ^{[10
]}

Behrend, R. ^{[13
]}

Benkhaldoun, Z. ^{[14
]}

Brosch, N. ^{[15
,16
]}

Daassou, A. ^{[14
]}

Frappa, E. ^{[17
]}

Gal-Yam, A. ^{[18
]}

Garcia-Lozano, R. ^{[19
]}

Gillon, M. ^{[20
]}

Jehin, E. ^{[20
]}

Kaspi, S. ^{[15
,16
]}

Klotz, A. ^{[21
]}

Lecacheux, J. ^{[2
]}

Mahasena, P. ^{[22
]}

Manfroid, J. ^{[20
]}

Manulis, I. ^{[18
]}

Maury, A. ^{[23
]}

Mohan, V. ^{[24
]}

Morales, N. ^{[3
]}

Ofek, E. ^{[18
]}

Rinner, C. ^{[25
]}

Sharma, A. ^{[26
]}

Sposetti, S. ^{[13
]}

Tanga, P. ^{[27
]}

Thirouin, A. ^{[28
]}

Vachier, F. ^{[6
]}

Widemann, T. ^{[2
]}

Asai, A. ^{[11
]}

机构：

[1] Observ Nacl MCTI, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[2] Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS UMR 8109, LESIA Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France

[3] Inst Astrofis Andalucia CSIC, Apt 3004, E-18080 Granada, Spain

[4] Fed Univ Technol Parana UTFPR DAFIS, R Sete Setembro 3165, BR-80230901 Curitiba, Parana, Brazil

[5] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Ave Vicuna Mackenna 4860, Santiago 7820436, Chile

[6] IMCCE Observ Paris, 77 Ave Denfert Rochereau, F-75014 Paris, France

[7] Lab Interinst E Astron LIneA, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil

[8] Observ Valongo UFRJ, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ, Brazil

[9] Phys Res Lab, Ahmadabad 380009, Gujarat, India

[10] Chinese Acad Sci, Yunnan Observ, Beijing, Yunnan, Peoples R China

[11] JOIN, Kagoshima, Japan

[12] Natl Astron Res Inst Thailand, Siriphanich Bldg, Chiang Mai 50200, Thailand

[13] Observ Geneva, CH-1290 Versoix, Switzerland

[14] Cadi Ayyad Univ, Oukaimeden Observ, LPHEA, Marrakech, Morocco

[15] Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel

[16] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[17] EURASTER, 8 Route Soulomes, F-46240 Labastide Murat, France

[18] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-7610001 Rehovot, Israel

[19] Observ Busot, Valencia, Spain

[20] Univ Liege, Inst Astrophys Geophys & Oceanog, Allee 6 Aout 17, B-4000 Liege, Belgium

[21] Univ Toulouse, UPS OMP, IRAP, 14 Ave Edouard Belin, F-31400 Toulouse, France

[22] Inst Teknol Bandung, Observ Bosscha, Bandung, Indonesia

[23] SPACE, San Pedro de Atacama, Chile

[24] IUCAA Girawali Observ, Pune, Maharashtra, India

[25] Moroccan Oukaimeden Sky Survey, Marrakech, Morocco

[26] Nikaya Observ, Krishnagiri 635114, Tamil Nadu, India

[27] Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange,UMR7293, Blvd Observ CS 34229, F-06304 Nice, France

[28] Lowell Observ, 1400 W Mars Hill Rd, Flagstaff, AZ 86001 USA

[29] IOTA, POB 7152, Kent, WA 98042 USA

[30] Samford Valley Observ, Brisbane, Qld, Australia

[31] Royal Astron Soc New Zealand, Occultat Sect, Wellington, New Zealand

[32] Amateursternwarte Mueggelheim, Wiesbacher Weg 8, D-12559 Berlin, Germany

[33] BAA Asteroids & Remote Planets Sect, Hill Rise,Knowl Hill Common, Reading RG10 9YD, Berks, England

[34] C Jaume Balmes 24, E-08348 Cabrils, Spain

[35] Archenhold Observ, Neue Krugallee 180, D-12437 Berlin, Germany

来源：

ASTRONOMICAL JOURNAL | 2017年 / 154卷 / 01期

基金：

欧洲研究理事会;

关键词：

Kuiper belt objects: individual (208996; 2003AZ84); occultations; planets and satellites: fundamental parameters; planets and satellites: surfaces; TRANS-NEPTUNIAN OBJECTS; SHORT-TERM VARIABILITY; SOLAR-SYSTEM; 2060; CHIRON; ALBEDO; RADIUS; PLANET; CENTAURS;

D O I：

10.3847/1538-3881/aa74e9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present results derived from four stellar occultations by the plutino object (208996) 2003. AZ(84), detected on 2011 January 8 (single-chord event), 2012 February 3 (multi-chord), 2013 December 2 (single-chord), and 2014 November 15 (multi-chord). Our observations rule out an oblate spheroid solution for 2003. AZ(84)'s shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes (470 +/- 20) x (383 +/- 10) x (245 +/- 8) km can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75 hr) and the amplitude of its rotation light curve, we derive a density rho = 0.87 +/- 0.01g cm(-3), a geometric albedo p(V) = 0.097 +/- 0.009. A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003. AZ(84) ' s limb, which can be interpreted as an abrupt chasm of width similar to 23. km and depth >8 km, or a smooth depression of width similar to 80. km and depth similar to 13 km (or an intermediate feature between those two extremes).

引用

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