800Whrs+ Staying Up Late ideas |
800Whrs+ Staying Up Late ideas |
Jun 6 2009, 07:04 AM
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#1
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
With Spirit producing an annoyingly large amount of power given her current predicament, the time may well have come to re-open the Gusev astronomy society. Anyone have any dusk / nightime observation ideas?
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Jul 1 2009, 01:37 PM
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#2
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Martian Photographer Group: Members Posts: 352 Joined: 3-March 05 Member No.: 183 |
The streaks are just cosmic rays. Most CRs are small splotches, but these long exposures are enough to catch several at glancing incidence. If the navcam frames had actual meteors, the pancam L1 frames would be chock full of them--and the incidence of streaks in pancam and navcam is about the same. In fact, in the whole meteor search last time we had this kind of power, streaks were just as common in "dark" filters as in the clear filter. I've heard some analysis suggests we need to repeat 2005s observations 10x to have an expected value of 1 meteor, given camera sensitivities. So we'd need >100 2005s to get statistics. So, maybe no surprise that "meteor search" hasn't been showing up at the tracking data base. (Of course, when possible, stereo exposures are used and the exposure time is slightly offset so there's a chance one will be spotted and give speed and direction info--as long as that doesn't interfere with other objectives.)
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