Photometric and spectroscopic observations of Sycorax, satellite of Uranus

J. Romon, C. de Bergh, M. A. Barucci, A. Doressoundiram, J.-G. Cuby, A. Le Bras, S. Douté, B. Schmitt
2001 Astronomy and Astrophysics  
Sycorax is the brightest of the five irregular Uranian satellites recently discovered. These satellites are supposed to be captured bodies. We present visible and near-infrared photometry, as well as near-infrared spectroscopy of Sycorax. The overall shape of the spectrum is quite puzzling: it has a red slope in the visible (such as Centaurs and Transneptunian objects), whereas the reflectivity strongly decreases beyond 1 µm and is rather flat over the near-infrared range. We were not able to
more » ... produce the spectral behaviour of Sycorax using simple materials. A rotational effect is suggested to explain the shape of the spectrum. BVRIJ magnitudes have been measured over a period of 1 hour, with five V measurements which do not show any strong variation. So only a strong change in the magnitude between the V measurements and the J measurement (30 min later) could explain the shape of the spectrum, but further investigation is required to conclude.
doi:10.1051/0004-6361:20010934 fatcat:uobsekjycvhmpbue7cnyzujzfy