NGC6888 (Crescent Nebula) HA OIII
Posted: 17 September 2022
On Friday, 16 September 2022, I posted a special announcement on Facebook:
Open: Friday, 16 September 2022, 1809 MST
12" f/8 LX600 w/StarLock
2" 24mm UWA eyepiece
Filter Slider System
2" H-Alpha filter
2" OIII filter
1816 MST: Dome OFF.
1826-1900 MST: Relaxed on the observatory patio bench.
1830 MST: Sunset.
1902 MST: LX600 ON, StarLock OFF, High Precision OFF.
Viewed Saturn, 102X.
1907 MST: Relaxed on the bench to watch the stars come out.
1935 MST: Back in the observatory. Prepared the D850 DSLR for imaging NGC6888 (Crescent Nebula). Since I would be imaging using the Optolong H-Alpha and OIII filters, I used the Starizona Filter Slider System to mount the D850 DSLR at prime focus. Focused on the star Deneb and locked the 12" primary mirror.
1950 MST: High Precision ON.
Slewed to NGC6888 (Crescent Nebula).
1952 MST: StarLock ON.
I took six StarLock autoguided images using the HA filter (5 minutes, ISO 3200) and six with the OIII filter (ISO 6400, 5 minutes). When switching filters I refocused on Deneb. Here is one of each filter image (edited) and the stacked result for each filter (using Affinity Photo).
This is a merge of the two stacked images using Adobe Photoshop.
2121 MST: StarLock OFF, High Precision OFF.
Removed the camera and Filter Slider System. Viewed NGC6888 (Crescent Nebula), 102X. Then viewed Jupiter, 102X.
2133 MST: LX600 OFF.
2137 MST: Dome ON.
2143 MST: Took a Sky Quality reading.
Close: Friday, 16 September 2022, 2146 MST
Session Length: 3h 37m|
Conditions: Clear, SQM 20.96
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