Home > Uncategorized > NGC 6888, the Crescent Nebula in Cygnus

NGC 6888, the Crescent Nebula in Cygnus

I’m like a kid in an H-alpha candy store!   Before Cygnus is out of its prime spot in my sky, I might as well capture its finest targets.

This is only 2h 16m of the Crescent Nebula because the focus went to crap as the night got colder. I’ve been switching between an EON120 and an AT8RC, and there is a dramatic difference in temperature sensitivity. The RC rarely needs to be re-focused, even across multiple nights! The EON 120 loses focus if the temperature changes 5 degrees. I don’t know whether to blame the focuser (the RC has a Feather Touch), or the long metal OTA, but it’s a pain.

34x4min (50+ flats and darks)
Self-modded Rebel XSi with Astrodon filter
EON120 on CGEM
Calibrated in DSS
Processed in Photoshop CS3

NGC 6888 The Crescent Nebula in Cygnus

NGC 6888 The Crescent Nebula in Cygnus

Upon reflection, I wish I’d done this one with the AT8RC.  It’s small enough, and the diffraction spikes would actually be nice here.  Next year.

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