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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29195
Title: (121514) 1999 UJ<SUB>7</SUB>: A primitive, slow-rotating Martian Trojan
Authors: Borisov, G.
Christou, A. A.
Colas, F.
Bagnulo, S.
CELLINO, Alberto 
DELL'ORO, Aldo 
Issue Date: 2018
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 618
Abstract: <BR /> Aims: The goal of this investigation is to determine the origin and surface composition of the asteroid (121514) 1999 UJ<SUB>7</SUB>, the only currently known L<SUB>4</SUB> Martian Trojan asteroid. <BR /> Methods: We have obtained visible reflectance spectra and photometry of 1999 UJ<SUB>7</SUB> and compared the spectroscopic results with the spectra of a number of taxonomic classes and subclasses. A light curve was obtained and analysed to determine the asteroid spin state. <BR /> Results: The visible spectrum of 1999 UJ<SUB>7</SUB> exhibits a negative slope in the blue region and the presence of a wide and deep absorption feature centred around 0.65 μm. The overall morphology of the spectrum seems to suggest a C-complex taxonomy. The photometric behaviour is fairly complex. The light curve shows a primary period of 1.936 d, but this is derived using only a subset of the photometric data. The asteroid may be in a non-principal axis rotational state, but our observational coverage is insufficient to draw definitive conclusions. <BR /> Conclusions: Although the observed spectral absorption is wider and deeper, this finding may be compatible with the 0.7 μm spectral feature exhibited by some Ch-type asteroids and could possibly be interpreted as diagnostic of the presence of hydrated minerals. The inferred composition of 1999 UJ<SUB>7</SUB> as a primitive object can be consistent with a volatile-rich object originally accreted beyond the snow line of the solar system, and subsequently evolved to reach the inner regions of the solar system. <P />Based on service observations made with the 4.2 m William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias and on data collected with 2 m Ritchey-Chrétien-Coudé (2mRCC) Telescope at Rozhen National Astronomical Observatory.
URI: http://hdl.handle.net/20.500.12386/29195
URL: https://www.aanda.org/articles/aa/full_html/2018/10/aa32466-17/aa32466-17.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201732466
Bibcode ADS: 2018A&A...618A.178B
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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