Derek C Breit posted: >Each exposure is ~2.2s.. This is an active DSP satellite (DSP F14, 20066, 89-46A) that was launched 20 years ago. Such satellites rotate every 10 seconds and have 4 solar panels tilted at the top. So flashes are seen from each solar panel every 2.5 seconds. Flashes from 20066 are usually seen from Texas from about 03:50 UT until about 4:30 UT. So if you have an exposure time of 2.2 seconds, you will usually see one of those (very brief) flashes. But every once in a while your exposure will take place in between two flashes and you won't see it. 8 exposures would take 17.6 seconds. There will be 7 flashes in 17.5 seconds. Mike McCants ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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