Imaging: Auriga Open Star Clusters, M74 & M77 Galaxies
Posted: 28 January 2017
Open: Friday, 27 January 2017, 1807 MST
Conditions: Clear, breezy
1812 MST: 12" LX600 ON, StarLock OFF, High Precision OFF.
First, I took a quick look at the planet Venus, 102X.
I then did some minor work in the observatory. I moved a shelf inside one of the POD bays to the back of the bay. With the larger telescope now in the observatory I kept bumping a red light that was mounted on the shelf with the telescope in some orientations. With the shelf moved I should no longer have that problem.
Next, I began preparing for Deep Sky Object (DSO) astrophotography, if the strong breezes would allow it. I wanted to do some more Messier Catalog imaging for my Messier Catalog Astrophotography Album update. In particular I wanted to image three open star clusters in the constellation of Auriga: M36, M37, and M38. I also wanted to re-do the M74 and M77 galaxies that I had imaged on the previous, poor seeing, session. Slewed the telescope to the star Capella and SYNCed the AutoStar. Mounted the D7200 DSLR at prime focus + focal reducer. 1843 MST: wind gusts were getting stronger. Focused Capella using the Bahtinov Mask and locked the primary mirror.
1905 MST: StarLock ON. Began imaging the Auriga open star clusters. These are full-frame images, StarLock autoguided, 30 seconds, ISO 800, White Balance 4000K:
Next, slewed to M74 (galaxy) and did a 1 minute, ISO 6400, test exposure. Seeing was not good again this night, but was not as bad as on the previous night. I also noticed that I needed to tweak the focus. First I SYNCed the AutoStar on M74 with it centered in the DSLR field-of-view. Then slewed to the star EPS AND and tweaked the focus using the Mask. Returned to M74 and imaged it, followed by M77 (galaxy). Both were StarLock autoguided, 5 minutes, ISO 6400, WB 4000K. The following images are slightly cropped from the full-frame images.
I was pleased that I captured the faint outer spiral arms in M77.
1949 MST: StarLock OFF. Ended imaging.
2001 MST: viewed M77 (galaxy), 102X. Nice view with some structure visible. Then began closing up for the night due to the wind.
Close: Friday, 27 January 2017, 2010 MST
Session Length: 2h 03m|
Conditions: Clear, windy
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