|
|||||
|
|
832 Karin: Absence of rotational spectral variations |
|
| Authors: | Pierre Vernazza Alessandro Rossi Marcello Fulchignoni Elisabetta Dotto |
| Institution: | a LESIA, Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon Principal Cedex, France b Spaceflight Dynamics Section, ISTI-CNR, Via Moruzzi 1, 56124 Pisa, Italy c IMCCE, Observatoire de Paris, 77 Av. Denfert Rochereau, 75014 Paris Cedex, France d Astronomical Institute of the Romanian Academy, Cutitul de Argint-5, Bucharest, Romania e INAF, Osservatorio Astronomico di Roma, Via Frascatti 33, 00040 Monteporzio Catone, Italy |
| Abstract: | 832 Karin is the largest member of the young Karin cluster that formed 5.75±0.05 Myr ago in the outer main belt. Surprisingly, recent near-IR spectroscopy measurements Sasaki, T., Sasaki, S., Watanabe, J., Sekiguchi, T., Yoshida, F., Kawakita, H., Fuse, T., Takato, N., Dermawan, B., Ito, T., 2004. Astrophys. J. 615 (2), L161-L164] revealed that Karin's surface shows different colors as a function of rotational phase. It was interpreted that 832 Karin shows us the reddish space-weathered exterior surface of the parent body as well as an interior face, which has not had time to become space-weathered. This result is at odds with recent results including seismic and geomorphic modeling, modeling of the Karin cluster formation and measurements of the space weathering rate. Consequently, we aimed to confirm/infirm this surprising result by sampling Karin's spectrum well throughout its rotation. Here, we present new visible (0.45-0.95 μm) and near-infrared (0.7-2.5 μm) spectroscopic observations of 832 Karin obtained in January and April 2006, covering most of Karin's longitudes. In the visible range, we find that Karin shows no rotational spectral variations. Similarly, we find that Karin exhibits very little (to none) spectral variations with rotation in the near-IR range. Our results imply that 832 Karin has a homogeneous surface, in terms of composition and surface age. Our results also imply that the impact that generated the family refreshed entirely Karin's surface, and probably the surfaces of all members. |
| Keywords: | Asteroids rotation Spectroscopy Asteroids surfaces Regoliths |
| 本文献已被 ScienceDirect 等数据库收录！ | |