Where is New Horizons now |
Where is New Horizons now |
Mar 29 2006, 02:58 PM
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#1
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Junior Member Group: Members Posts: 22 Joined: 2-March 06 Member No.: 691 |
i found this web site
http://www.heavens-above.com/solar-escape.asp it show where NH is compared to voy1, 2/pioneer any one else have a fav web page that shows NH loc? I think this one is updated onece a day |
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Jul 27 2010, 10:45 PM
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#2
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
There is a new release on the New Horizons web site with distant images of Jupiter and Neptune
http://pluto.jhuapl.edu/news_center/news/20100727.php |
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Aug 11 2010, 10:32 AM
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#3
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Newbie Group: Members Posts: 16 Joined: 30-March 08 Member No.: 4078 |
There is a new release on the New Horizons web site with distant images of Jupiter and Neptune. The images don't really look all that high quality -- did they not do proper bias/flat field calibration or is there something I'm missing? Certainly I would expect a fair bit of shot noise, but... |
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Aug 11 2010, 12:04 PM
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#4
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Looking at the Jupiter image, my impression is that it was "brightened", as in reduced contrast (well, reduced compared to how it's normally reproduced) to show the Galilean satellites. This would also bring out low level noise, especially ratty noise like that given the really short exposure setting.
The detector and its gain isn't optimized for such short (9 ms) exposures, it was optimized for an order of magnitude longer exposures needed at Pluto. Even in the Jupiter flyby images it could be seen the images are distinctly noisier when exposure was kept shorter to avoid too much saturation. The shot noise in the background could also be due to scattered light from looking that close to the sun. In short, the conditions were far from optimal for LORRI. -------------------- |
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