On Friday, 16 September 2022, I posted a special announcement on Facebook:

Open: Friday, 16 September 2022, 1809 MST Temperature: 80°F

Session: 1789 Conditions: Clear

Equipment:
12" f/8 LX600 w/StarLock
2" 24mm UWA eyepiece
Filter Slider System
2" H-Alpha filter
2" OIII filter

Camera:
D850 DSLR

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).

H-Alpha

H-Alpha stacked


O-III

O-III stacked

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 Temperature: 68°F

Session Length: 3h 37m Conditions: Clear, SQM 20.96

---

Comments are welcome using Email. Twitter users can use the button below to tweet this report to their followers. Thanks.

Tweet

---

Previous report

Cassiopeia Observatory Home Page