NGC 6633

NGC 6633 is an open cluster, in the constellation Ophiuchus.  It is almost as large as the full moon, and contains 30 stars and its age is approximately 660 million years (source: wikipedia).  I imaged this object as we had a couple of somewhat clear nights last week and the moon was not coming out until later in the evening.  This cluster was in the perfect location so I went ahead with it.  I wanted to practice with APT rather than BYE but was I did not trust the focusing so I went back to BYE.

This may be surprising to most but I used dithering for the first time on an object.  I like the quality of what I obtained, however, it took up to 50 seconds between exposures.  Dithering while shooting with long exposures, three minutes or more, is definitely worthwhile.  However, for shorter exposures, 90 seconds or less, it adds a significant amount of time which may be better spent collecting more sub frames.

Wide Field

Crop

NGC 6633
Location: Happy Frog Observatory, Monroe, CT
Date/Time: 09/10/17
Camera: Canon EOS Rebel T3i, Backyard EOS
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
f/7.5
Mount: Orion Sirius EQ-G GoTo Telescope Mount
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Filter: None
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: 38 x 90 sec
ISO: 1600
Temp: 15 C
Post Processing: Deep Sky Stacker, Photoshop, StarTools, Lightroom, Gradient Exterminator, Astrophotography Tools, HLVG
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