1 Asteroid Occultations & Light-curve Inversion models
2 This is based on a paper published in ICARUS this year, with the following authors: Josef Durech, Mikko Kaasalainen, David Herald, David Dunham, Brad Timerson, Josef Hanus, Eric Frappa, John Talbot, Tsutomu Hayamizu, Brian D. Warner, Frederick Pilcher, Adrian Galad
3 Asteroidal occultations…. Give dimensions of an asteroid (at about 1-km accuracy) as oriented at the time of the occultation
8 Irregular shape causes rotational light curve variation When polar axis is inclined to the ecliptic, the parts of the asteroid that are ‘visible’ varies, depending on location in orbitCan model the shape of the asteroid using the differing light curves – called ‘inversion models’
9 Requires accurate measurement of the rotation period, and determination of the direction of the axis of rotationThe model gives a shape for the asteroid, but not its sizeMost models currently are limited to convex surfacesSometimes more than one model fits the available data
11 Combining Occultations with inversion models If the 3-D model is generated for the orientation at the time of an occultation, it can be matched.Matching:Puts a definite scale to the 3-D modelDiscriminates between different models
12 Very recent example : (516) Amherstia 2011 Apr 18
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