Reference : 2003 AZ84: Size, shape, albedo and first detection of topographic features
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
2003 AZ84: Size, shape, albedo and first detection of topographic features
Dias-Oliveira, Alex [Observatório Nacional]
Sicardy, Bruno [Observatoire de Paris/LESIA]
Ortiz, Jose-Luis [Instituto de Astrofsica de Andaluca-CSIC,]
Braga-Ribas, Felipe [Federal University of Technology - Parana (UTFPR / DAFIS)]
Vieira-Martins, Roberto [Observatório Nacional]
BENEDETTI Rossi, Gustavo [Observatório Nacional]
camargo, Julio [Observatório Nacional]
Assafin, Marcelo [Observatorio do Valongo/UFRJ]
Gomes-Júnior, Altair [Observatorio do Valongo/UFRJ]
Baug, Tapas [Physical Research Laboratory]
Chandrasekhar, Thyagarajan [Physical Research Laboratory]
Duffard, Rene [Instituto de Astrofsica de Andaluca-CSIC,]
Ergang, Zhao [Chinese Academy of Sciences]
Ganesh Ganesh, Shashikiran [Physical Research Laboratory]
Ikari, Yasukazu [Japan Occultation Information Network]
Irawati, Puji [National Astronomical Research Institute of Thailand,]
Jain, Rajmal [Physical Research Laboratory]
Liying, Zhu [Chinese Academy of Sciences]
Richichi, Andrea [National Astronomical Research Institute of Thailand,]
Shengbang, Qian [Chinese Academy of Sciences]
Behrend, Raoul [Observatoire de Geneve]
Benkhaldoun, Zouhair [Moroccan Oukaimeden Sky Survey]
Brosch, Noah [Wise Observatory]
Daassou, Ahmed [Moroccan Oukaimeden Sky Survey]
Gal-Yam's, Avishay [Weizmann Institute of Scienc]
Gillon, Michaël [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Jehin, Emmanuel [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Kaspi, Shai [Wise Observatory]
Klotz, Alain [Universite de Toulouse,]
Lecacheux, Jean [Observatoire de Paris/LESIA]
Mahasena, Putra [Observatorium Bosscha]
Manfroid, Jean [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Manulis, Ilan [Weizmann Institute of Scienc]
Maury, Alain [San Pedro de Atacama Celestial Explorations]
Mohan, Vijay [IUCAA Girawali Observatory,]
Morales, Nicolas [Instituto de Astrofsica de Andaluca-CSIC,]
Rinner, Claudine [Moroccan Oukaimeden Sky Survey]
Roques, Françoise [Observatoire de Paris/LESIA]
Sharma, Amar [Nikaya Observatory]
Sposetti, Stefano [Observatoire de Geneve]
Tanga, Paolo [Observatoire de la Côte d'Azur]
Thirouin, Audrey [Lowell Observatory]
Vachier, Frederic [Observatoire de Paris?IMCCE]
Widemann, Thomas [Observatoire de Paris/LESIA)]
AAS/Division for Planetary Sciences Meeting Abstracts
48th Meeting of the Division for Planetary Sciences
16-21 october 2016
American Astronomical Society
[en] We analyze two multi-chord stellar occultations by the Trans-Neptunian Object (TNO) 2003 AZ84 observed on February 3, 2012 and November 15, 2014.They provide different elliptical limb fits that are consistent to within their respective error bars, but could also suggest a possible precession of the object (assumed here to be a Maclaurin spheroid). The derived equatorial radius and oblateness are R[SUB]e[/SUB] = 393 ± 7 km and ɛ = 0.057 in 2014 and R[SUB]e[/SUB] = 414 ± 13 km and ɛ = 0.165 in 2012, respectively. Those results are consistent with single-chord events observed in January 2011 and December 2013. The figures above provide geometric visual albedos of p[SUB]V(2014)[/SUB] = 0.112 ± 0.008 and p[SUB]V(2012)[/SUB] = 0.114 ± 0.020. Using the Maclaurin assumption, combined with possible rotational periods of 6.67 h and 10.56 h, we estimate density upper limits of 1.89 ± 0.16g/cm[SUP]3[/SUP] and 0.77 ± 0.07g/cm[SUP]3[/SUP] for the two dates, respectively.The 2014 event provides (for the first time during a TNO occultation) a grazing chord with a gradual disappearance of the star behind 2003[SUB]AZ[/SUB]84's limb that lasts for more than 10 seconds. We rule out the possibility of a localized dust concentration as it would imply very high optical depth for that cloud. We favor a local topographic feature (chasm) with minimum width and depth of 22 ± 2.5 km and 7 ± 2.0 km, respectively. Features with similar depths are in fact observed on Pluto's main satellite, Charon, which has a radius of about 605 km, comparable to that of 2003[SUB]AZ[/SUB]84.

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