Pluto Surface Observations 3: NH Post-Encounter Phase, 1 Feb 2016- TBD |
Pluto Surface Observations 3: NH Post-Encounter Phase, 1 Feb 2016- TBD |
Jan 30 2016, 07:21 AM
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This topic is for all New Horizons Pluto surface observations received after 1 Feb 2016.
-------------------- 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 2 2016, 09:29 PM
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Member Group: Members Posts: 244 Joined: 2-March 15 Member No.: 7408 |
After acknowledging that the last thing I'd played with could probably have been completed many hundreds of hours faster if I'd bothered to work with SPICE kernels, I decided to write some handling of SPICE kernel data into my coding environment and play around with it. I implemented the Owen & O'Connell Distortion Model for LORRI, described in the instrument kernel so I can go back and forth between pixel coordinates and camera frame vectors and played around with seeing what that and the other SPICE kernels allowed me to do. I tried reproducing that spirally approach animation without any manual work and I got a half decent result. The one I created by spending hundreds of hours aligning stuff by hand wasn't nearly as shaky, so perhaps it wasn't all time wasted.
I don't know what exactly I'll do, now that I have J2000 position and orientation data for New Horizons, LORRI, Pluto, and Charon at the time of each LORRI observation, but here's something I've been working on using it. I've used the data and the camera model to orient and roughly align the LORRI frames (and their pixels) in J2000 on Pluto, sampled based on distance, such that Pluto shows up the same size in each frame, and after a bunch of manual combining and fine-tuning of image position, here's a little animation of a full rotation of Pluto, as seen by LORRI, played at 150,000 times actual speed: It uses 31 sets of LORRI observations (each frame combines multiple LORRI frames from the same...observation set or whatever you call it; the last 5 frames are actually mosaics), whittled down from 42 since some were very close in time to others. The original size of this animation had Pluto 1024 pixels in diameter, but I've shrunk it to less than 200 to bring the file size under what the forum can take. It looks better smaller anyway, because the difference in quality from the earliest to the latest frame isn't quite as visible. If it looks like Pluto wanders a little for 1/3 of this, it's because I slowly shifted the frames over in this version to make the last frame and first frame line up better (the last frame was taken from very close to Pluto and the change in perspective between that and the first frame is significant). |
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