Juno at Jupiter, mission events as they unfold |
Juno at Jupiter, mission events as they unfold |
Jul 5 2016, 07:53 PM
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic will consist of discussion of Juno operations post-JOI until end of mission, currently anticipated in Feb 2018.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Aug 9 2016, 05:04 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
Image JNCE_2016164_00C200 is sensitive to the number of JunoCam frames per rotation.
So, I've chosen this image to explore the 3-dimensional subspace of RGB-aligned solutions within the 7-dimensional space of the considered family of camera models, which assume zero chromatic aberration. This graphics assumes the optical axis at y = 600, and a Brownian K2 = 2.6E-15. It varies the x-position of the optical axis: These assumptions imply a CCD rotated around z by about 0.00283 radians. This is the according csv file: JNCE_2016164_00C200_V01_proc014b_1_00x.BMP_RGBGradCSV.txt ( 1.25K ) Number of downloads: 219 I tried K2 = 0; the effect has been tiny: JNCE_2016164_00C200_V01_proc014c_1_00x.BMP_RGBGradCSV.txt ( 1.25K ) Number of downloads: 220 K2 affects mainly the area near the left and right margin of the images. Since in the images Jupiter is closer to the center, the subspace of main interest for the Jupiter Approch sequence is the 2-dimensional projection which neglects K2. Assuming y = 620 reduced the z-rotation of the CCD: JNCE_2016164_00C200_V01_proc014d_1_00x.BMP_RGBGradCSV.txt ( 1.25K ) Number of downloads: 233 This led me to set the z-rotation of the CCD to zero. The result is a y-position of the optical axis near 624.5 (without adjusting for TDI) : JNCE_2016164_00C200_V01_proc014e_1_00x.BMP_RGBGradCSV.txt ( 1.25K ) Number of downloads: 234 For the lab value of K1 = 3.839251E-8, K2 = 0, and zero CCD rotation, I got an optical axis position near (835.0; 624.6) (with (0; 0) at the lower left, and again without adjusting for the 1.5 pixels y-displacement for TDI 4) : JNCE_2016164_00C200_V01_proc014f_1_00x.BMP_RGBGradCSV.txt ( 404bytes ) Number of downloads: 240 |
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