Discovery Program 2006 and Missions Of Opportunity |
Discovery Program 2006 and Missions Of Opportunity |
Guest_AlexBlackwell_* |
Jan 3 2006, 10:19 PM
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#1
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Guests |
I'm not sure exactly which forum this fits in but NASA has just released the AO for Discovery Program 2006 and Missions of Opportunity. See the Discovery Program Acquisition Home Page for more details. Click on the "Discovery AO" link to download the PDF.
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Nov 1 2006, 12:14 AM
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#2
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Member Group: Members Posts: 710 Joined: 28-September 04 Member No.: 99 |
I don't understand why Deep Impact is considered for an extended mission when its High Res imager is Badly Blurred Beyond Belief. I remember a lot of talk about deconvolution, but a year later all I see on their website are these pictures:
http://deepimpact.jpl.nasa.gov/gallery/jpg...HRI_Impact1.jpg http://deepimpact.jpl.nasa.gov/gallery/jpg/goneinaflash.jpg http://deepimpact.jpl.nasa.gov/gallery/jpg/nucleus-516.jpg What's the point of flying this camera to another comet? |
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Nov 1 2006, 07:41 AM
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#3
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
What's the point of flying this camera to another comet? Because it's still the best camera for looking at Comets during a flyby we've ever had, and combined with its ability to take IR Spectra, it offers a very very cheap way of exploring another comet for something less than 10th the price of a new dedicated mission. And - when it comes to measuring transits with an out of focus camera....all you're doing is counting photons, and that can be done just as well with an out of focus instrument in actual fact...it's not ideal, but it will do the job (and if it couldn't, they wouldn't have been selected for the next study phase) Doug |
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Nov 1 2006, 09:47 AM
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#4
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
all you're doing is counting photons, and that can be done just as well with an out of focus instrument in actual fact...it's not ideal, but it will do the job It may in fact be ideal because you don't want sharp images of the stars as the physical structure of the CCD pixels has discontinuities. If you had a very sharp, point-like star image, small attitude disturbances will project the image on different parts of the pixel region, possibly on the boundary between two pixels. This would make the brightness appear to oscillate. With an out-of-focus image, you sum up the smudged area which is less prone to such artifacts. A similar think is done in star scanners, AFAIK. -------------------- |
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