Rotational Poles and Dimensions of Ceres and Vesta and three STEAs

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Rotational Poles and Dimensions of Ceres and Vesta and three STEAs. Jack Drummond Starfire Optical Range Air Force Research Lab. Rotating 3x2x1 Asteroid. Fits are Made in the Fourier Plane. Image = E סּ L ₣ (Image) = K 0 2J 1 (x)/x. Juno Fit Diagnostics Shane 3 m at 2.1 μ m. - PowerPoint PPT Presentation

Transcript of Rotational Poles and Dimensions of Ceres and Vesta and three STEAs

  • Rotational Poles and Dimensions of Ceres and Vestaand three STEAsJack DrummondStarfire Optical RangeAir Force Research Lab

  • Rotating 3x2x1 Asteroid

  • Fits are Made in the Fourier PlaneImage = E L

    (Image) = K0 2J1(x)/x

  • Juno Fit DiagnosticsShane 3 m at 2.1m

  • Davida Fit Diagnostics Keck 10 m at 2.1m

  • Ceres(=5550) December 2003 HST

  • Ceres Oblate Spheroid Observations

  • Ceres Pole

  • Ceres Dimensions This work Thomas et ala=b== 4801 km 487.31.5 km

    c=[2-a2 sin()2] / cos()= 4481 km 454.71.5 km

  • Vesta October 1997 HST

  • VestaTriaxial Results

  • Vesta: AO on Lick 3 m

  • Vesta Resolved

  • HSTLightcurvesSIAO

  • Weighted Mean VestaThis Work (n=4)Thomas et ala = 5622 km 57810 kmb = 5432 km 56010 kmc = 4584 km 45810 km

    RA = 325 301Dec= +55 +41Error radius = 6.7 5

  • 511 Davida with AO at Keck

  • 511 Davida with AO at Keck

  • 511 Davida with AO at Keck

  • Davida Edge Features

  • 52 Europa with AO at Keck

  • 52 Europa with AO at Keck

  • 52 Europa with AO at Keck

  • 2 Pallas with AO at Keck

  • Pallas Pole on Ecliptic Globe

  • 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