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Pole orientation and triaxial ellipsoid shape of (25143) 1998 SF36, a target asteroid of the MUSES-C* mission

  • Youhei Ohba1,
  • Masanao Abe1,
  • Sunao Hasegawa1,
  • Masateru Ishiguro1,
  • Tomasz Kwiatkowski2,
  • Francois Colas3,
  • Budi Dermawan4 and
  • Akira Fujiwara1
Earth, Planets and Space201455:BF03351767

https://doi.org/10.1186/BF03351767

Received: 14 March 2003

Accepted: 10 July 2003

Published: 20 June 2014

Abstract

The near-earth asteroid (25143) 1998 SF36 is a target body for the Japanese sample-return MUSES-C mission. We present here its pole orientation and triaxial ellipsoid shape, using light curve data obtained with three telescopes at Kiso, Mitaka, and Pic du Midi. The solution obtained for the pole orientation has ecliptic latitude λ = 320 ± 30° and ecliptic longitude β = —75 ± 12°. The estimated triaxial ellipsoid shape is a/b= 2.1 and b/c= 1.7 assuming m= 0.03, which is the coefficient of the empirical relation between the light curve amplitude and the phase angle for S-type asteroids (Zappalà et al., 1990). We also found m to be related to asteroid surface roughness, using a light curve simulator.

Key words

Asteroidshapepole orientationsurface roughnessmission target