Bibcode
Santos-Sanz, P.; Ortiz, J. L.; Duffard, R.; Morales, N.; Fernández-Valenzuela, E.; Moreno, F.; Licandro, J.; Rizos, J. L.; Maestre, J. L.; Organero, F.; Fonseca, F.; Ana, L.; Pastor, S.; de los Reyes, J. A.
Referencia bibliográfica
Highlights on Spanish Astrophysics IX, Proceedings of the XII Scientific Meeting of the Spanish Astronomical Society held on July 18-22, 2016, in Bilbao, Spain, ISBN 978-84-606-8760-3. S. Arribas, A. Alonso-Herrero, F. Figueras, C. Hernández-Monteagudo, A. Sánchez-Lavega, S. Pérez-Hoyos (eds.), 2017 , p. 577-577
Fecha de publicación:
3
2017
Número de citas
0
Número de citas referidas
0
Descripción
596 Scheila is a main belt asteroid classified from 2010, when it
presented cometary appearance, like a Main Belt Comet (MBC). We only
known around a dozen of MBCs till to date. The MBCs present
asteroid-like orbits –between Mars and Jupiter– but they
have cometary appearances and/or behaviours. It is believed that the
activity of Scheila was triggered by the impact of a small asteroid (D
35 m) with a velocity 5 km/s. In order to study if the dust around
Scheila generated by this collision could have evolved to a thin ring
orbiting the body we have predicted stellar occultations by Scheila
favourable for Spain during 2015-2016. We found 3 possible favourable
events for the dates: 16 December 2015, 6 January 2016 and 21 January
2016. The first event was not observed due to bad weather conditions,
the second one was negative, finally, the third event was positive and
was observed from two Spanish sites separated 260 km: the
‘Observatorio de Albox’ in Alicante and the
‘Observatorio de La Hita’ in Toledo. From the analysis of
this positive multi-chord stellar occultation of a 14.8 magnitude star
we have obtained the equivalent diameter in projected area on the sky
plane of Scheila at the moment of the occultation (D = 115.1 ±
6.4 km) and its surface geometric albedo (pV = 3.67 ± 0.41 %).
Due to the small-sized telescopes involved in this occultation our limit
of detection for a dust ring around Scheila at 3σ is of 15 km,
with a maximum optical deep τ_{max} = 0.11. The research leading to
these results has received funding from the European Union’s
Horizon 2020 Research and Innovation Programme, under Grant Agreement no
687378.