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Catalogue POP – Notice individuelle de publication

Dias-Oliveira Alex, Sicardy Bruno, Ortiz José Luiz, Braga-Ribas F., Leiva Rodrigo, Vieira Martins Roberto, Benedetti-Rossi G., Camargo J. I. B., Assafin Marcelo, Gomes-Júnior A. R., Baug Tapas, Chandrasekhar T., Desmars Josselin, Duffard René, Santos-Sanz Pablo, Ergang Z., Ganesh Shashkiran, Ikari Y., Irawati P., Jain J., Liying Z., Richichi Andrea, Shengbang Q., Behrend Raoul, Benkhaldoun Zouhair, Brosch N., Daassou Ahmed, Frappa Eric, Gal-Yam Avishay, Garcia-Lozano Rubén, Gillon Michel, Jehin Emmanuel, Kaspi Shai, Klotz Alain, Lecacheux Jean, Mahasena Putra, Manfroid Jean, Manulis Ilan, Maury Alain, Mohan Vijay, Morales Nicolas, Ofek E., Rinner Claudine, Sharma Amar, Sposetti Stefano, Tanga Paolo, Thirouin Audrey, Vachier Frédéric, Widemann Thomas, Asai A., Hayato Watanabe, Hiroyuki Watanabe, Owada M., Yamamura H., Hayamizu Tsutomu, Bradshaw J., Kerr S., Tomioka H., Andersson S., Dangl G., Haymes T., Naves R., Wortmann G.

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

The Astronomical Journal, 2017, vol. 154

Référence DOI : 10.3847/1538-3881/aa74e9
Référence ADS : 2017AJ....154...22D

Résumé :

We present results derived from four stellar occultations by the plutino object (208996) 2003 AZ<SUB>84</SUB>, 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<SUB>84</SUB>'s shape. Instead, assuming hydrostatic equilibrium, we find that a Jacobi triaxial solution with semiaxes (470 /- 20)× (383 /- 10)× (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 /- 0.01 g cm<SUP>-3</SUP>, a geometric albedo {p}<SUB>V</SUB>=0.097 /- 0.009. A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003 AZ<SUB>84</SUB>'s limb, which can be interpreted as an abrupt chasm of width ˜23 km and depth > 8 km, or a smooth depression of width ˜80 km and depth ˜13 km (or an intermediate feature between those two extremes).

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