Article (Scientific journals)
Study of the plutino object (208996) 2003 AZ84 from stellar occultations: size, shape and topographic features
Dias-Oliveira, A.; Sicardy, B.; Ortiz, J. L. et al.
2017In Astronomical Journal, 154 (1), p. 13
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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] We present results derived from four stellar occultations by the plutino object (208996) 2003~AZ$_{84}$, detected at January 8, 2011 (single-chord event), February 3, 2012 (multi-chord), December 2, 2013 (single-chord) and November 15, 2014 (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 semi axes $(470 \pm 20) \times (383 \pm 10) \times (245 \pm 8)$~km % axis ratios $b/a= 0.82 \pm 0.05$ and $c/a= 0.52 \pm 0.02$, can better account for all our occultation observations. Combining these dimensions with the rotation period of the body (6.75~h) and the amplitude of its rotation light curve, we derive a density $\rho=0.87 \pm 0.01$~g~cm$^{-3}$ a geometric albedo $p_V= 0.097 \pm 0.009$. A grazing chord observed during the 2014 occultation reveals a topographic feature along 2003~AZ$_{84}$'s limb, that can be interpreted as an abrupt chasm of width $\sim 23$~km and depth $> 8$~km or a smooth depression of width $\sim 80$~km and depth $\sim 13$~km (or an intermediate feature between those two extremes).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Dias-Oliveira, A.
Sicardy, B.
Ortiz, J. L.
Braga-Ribas, F.
Leiva, R.
Vieira-Martins, R.
Benedetti-Rossi, G.
Camargo, J. I. B.
Assafin, M.
Gomes-Junior, A. R.
Baug, T.
Chandrasekhar, T.
Desmars, Josselin
Duffard, R.
Santos-Sanz, P.
Ergang, Z.
Ganesh, S.
Ikari, Y.
Irawati, P.
Jain, J.
Liying, Z.
Richichi, A.
Shengbang, Q.
Behrend, R.
Benkhaldoun, Z.
Brosch, N.
Daassou, A.
Frappa, E.
Gal-Yam, A.
Garcia-Lozano, R.
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, S.
Klotz, A.
Lecacheux, J.
Mahasena, P.
Manfroid, Jean  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Manulis, I.
Maury, A.
Mohan, V.
Morales, N.
Ofek, E.
Rinner, C.
Sharma, A.
Sposetti, S.
Tanga, P.
Thirouin, A.
Vachier, F.
Widemann, T.
Asai, A.
Watanabe, Hayato
Watanabe, Hiroyuki
Owada, M.
Yamamura, H.
Hayamizu, T.
Bradshaw, J.
Kerr, S.
Tomioka, H.
Andersson, S.
Dangl, G.
Haymes, T.
Naves, R.
Wortmann, G.
More authors (53 more) Less
Language :
English
Title :
Study of the plutino object (208996) 2003 AZ84 from stellar occultations: size, shape and topographic features
Publication date :
01 May 2017
Journal title :
Astronomical Journal
ISSN :
0004-6256
eISSN :
1538-3881
Publisher :
American Astronomical Society, United States
Volume :
154
Issue :
1
Pages :
13
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 July 2017

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