Galaxies Open clusters Nebula doubles, variables, comets, spaceships, etc
01-04-04 about 3 am
M3 (NGC 5272), globular cluster in Canes Venatici. 33,900 light years from earth. Magnitude 6.4, surface brightness 11.0, 18.6 arcminutes round. Stacked the results of Astrovideo's log funtion (15 frames @ 10 seconds). It took 46 minutes to capture. No dark frame used but needed. Eyeballed polar alignment. Optical train was 9.25" sct, f/6.3 r/c, flip mirror, 15 mm spacer, filter wheel loaded with Orion's Skyglow filter, then SAC 8 camera.
10 seconds, full gain.
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12-15-03 about 8 pm
Another shot at M15. 100 ten second exposures. 100 five second exposures. 100 two second exposures. 100 one second exposures. Then these four files stacked on top of each other in Photoshop.
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12-12-03
M79, a globular cluster about 42,000 light years from earth and 60,000 light years from our galactic center. Visual magnitude 7.7. Five second exposure. 52 out of 100 frames stacked. Used the f/6.3 reducer with a 15mm extention, filter wheel equiped with Orion's skyglow filter.
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11-4-03
M15, a globular cluster aout 33,000 light years from earth. Visual magnitude 6.2, 18 arcminutes. One second exposure. 18 out of 40 frames stacked.
Another M15. Unknown exposure.
