Determination of photometric properties of Steins

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Presentation transcript:

Determination of photometric properties of Steins Sofie Spjuth, MPS, Lindau Laurent Jorda, LAM, Marseille OSIRIS Team Meeting , September 18-20, 2007

Motivation Understanding the regolith Asteroids: - Constrain the physical properties of the regolith (composition, SS albedo, particle size, roughness) - Identify areas with different photometric properties - Compare the derived properties with that of other asteroids Comet nucleus: - Constrain the physical properties of different terrains identified at the surface of the comet nuclei (smooth terrains, etc.)

Method BDR - Distance → Solar irradiance (F) Camera characteristics (filter, exposure time) → reflected radiance (I) BDR = I/F SIMULATOR I = reflected radiance exiting from a surface in a particular direction F = irradiance incident on the surface Fitted against models HAPKE Least square fit → Hapke‘s parameters

SCHEDULE SIMULATOR SETUP Time (ET) Exposure time Filter(s) Shape Positions ... Observed, calibrated Images (n) ‚schedule‘ # i ‚devel‘ Image matching ‚shapecomp‘ s-file g-file Synthetic images ‚sim2map‘ Rotated image, # i imap_ emap_ ... ‚sim2flx‘ fmap_ Distances Filter(s) Solar irradiance ... Fit Hapke Parameters (n images) ‚hapke‘ no BDR i < n yes

Test case: simulator Steins BDR ~ 3000 measurements Measurement distance [km] Mean error [%] Min error [%] Max error [%] Mean error RMS error 750 - 100 000 0.23 4e-005 0.73 0.0082 0.0108 750 - 13 000 0.14 0.41 0.0038 0.0045

Test case: simulator Steins Distance range [km] w h g B0 θ “TRUE” PARAMS 0.40 0.02 -0.35 0.97 0.00 750 - 100 000 0.32 -0.53 1.38 23 3000 0.44 0.95 (0.20) (0.10) (-0.11) (0.40) (20) 5000 - 10000 0.47 fixed -0.29 4x4°

Test case: simulator Steins 259 116 measurements (750 – 3000 km) Fitted BDR Measured BDR

Test case: simulator Steins 259 116 measurements (750 – 3000 km) Fitted/Measured BDR Incidence Angle [°] Emission Angle [°]

Test case: simulator Steins Map of SSA 10x10° partitions 25 measurements in each image (2x2° shape model) Latitude Longitude

Test case: simulator Steins Map of error in SSA Latitude Longitude

Test case: simulator Steins # of measurements Latitude Longitude

Test case: simulator Steins # of measurements with resolution > 200 m/px Latitude Longitude

Test case: simulator Steins Phase angle range of measurements Latitude Longitude

Ongoing/Future Perform the photometry on earlier targets (Tempel1,Mathilde,Ida etc.) Simultaneous determination of shape and photometric properties such that the shape and its reflectance parameters best agree with the input images Comparison of the extracted BDR with laboratory measurements

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