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Size and Shape Analysis of Ceres and Vesta: Rotational Poles Revealed

Explore dimensions and poles of Ceres and Vesta through advanced imaging techniques like STAs and AO, shedding light on their intriguing characteristics.

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Size and Shape Analysis of Ceres and Vesta: Rotational Poles Revealed

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  1. Rotational Poles and Dimensions of Ceres and Vestaand three STEAs Jack Drummond Starfire Optical Range Air Force Research Lab

  2. Rotating 3x2x1 Asteroid

  3. Fits are Made in the Fourier Plane Image = E סּ L ₣ (Image) = K0 2J1(x)/x

  4. Juno Fit DiagnosticsShane 3 m at 2.1μm

  5. Davida Fit Diagnostics Keck 10 m at 2.1μm

  6. Ceres(λ=5550) December 2003 HST

  7. Ceres Oblate Spheroid Observations

  8. Ceres’ Pole

  9. Ceres Dimensions This work Thomas et al a=b=α= 480±1 km 487.3±1.5 km c=[β2-a2 sin(θ)2]½ / cos(θ)= 448±1 km 454.7±1.5 km

  10. Vesta October 1997 HST

  11. VestaTriaxial Results

  12. Vesta: AO on Lick 3 m

  13. Vesta Resolved

  14. Lightcurves HST SI AO

  15. Weighted Mean Vesta This Work (n=4) Thomas et al a = 562±2 km 578±10 km b = 543±2 km 560±10 km c = 458±4 km 458±10 km RA = 325° 301° Dec= +55° +41° Error radius = 6.7° 5°

  16. 511 Davida with AO at Keck

  17. 511 Davida with AO at Keck

  18. 511 Davida with AO at Keck

  19. Davida Edge Features

  20. 52 Europa with AO at Keck

  21. 52 Europa with AO at Keck

  22. 52 Europa with AO at Keck

  23. 2 Pallas with AO at Keck

  24. Pallas Pole on Ecliptic Globe

  25. STEAs(Standard Triaxial Ellipsoid Asteroids) a Al Conrad, Bill Merline, Christophe Dumas, Drummond et al. 2007, Icarus in press: ‘Direct measurement of the size, shape, and pole of 511 Davida with Keck AO in a single night’ b Merline et al. 2007, In prep: ‘Direct measurement of the size, shape, and pole of 52 Europa with Keck AO in a single night’ c Drummond and Julian Christou 2007, Icarus submitted: ‘Triaxial Ellipsoid Dimensions and Rotational Poles of Seven Asteroids from Lick Observatory Adaptive Optics Images, and of Ceres’

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