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Fri May 16, 2014, 11:34 AM

Detect known exoplanet with a DSLR and telephoto lens

Here's some science you can try at home, kids!

It's amazing what you can do with enough raw computer power and extremely modest instruments.

http://www.cloudynights.com/ubbthreads/showflat.php/Cat/0/Number/6526774/page/0/view/collapsed/sb/5/o/all/fpart/1#Post6527906

My target was HD189733b, which seems to be one of the easier transits to capture. It is also right next to M27, making it easy to find. I used the ETD (exoplanet transit database) site to determine transit times for my location. For my location, WV, there was a transit starting at 3:45am local time, ending at 5:35am local time on May 13th.

I used an unmodified Canon t3i and a Nikkor 300mm f/4.5 telephoto lens stepped with a 72-52 step down ring to about f/5.7. I took 15 second exposures every 30 seconds at iso200.

I then loaded 272 canon raw files into iris to register and align the images, and then used the automatic photometry tool in iris to generate the raw data. I used 4 reference stars on plus the HD189733 target star. I then ran 5 reference stars for a baseline. Here are the resulting light curve plots.


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