Posted by Liors
on Monday, June 28, 2021
Rho Ophiuchi is a multiple star system in the constellation Ophiuchus. it is located about 360 light-years from us, other stars in the system are slightly farther away.
This image has captured over 2 nights on Jun 10-11, 2021 from Negev desert Israel.
This relatively wide field image is due to a first use of my new QE 0.73X reducer .
The bright blue halo on the left side is from the star Sigma Scorpii, around this star there are multiple H- Alfa gas and dust which slightly shown in this image, I managed to capture 1 hour in HA filter but didn`t get enough data to my satisfaction.
If you take a close look at this image you can see a dark nebula in a shape of a pigeon and a seahorse above the pigeon.
Note that the first night was a bit windy and a bit cloudy but the second night was really come, the temp was steady all night, clear skies all night.
The skies are Bortle 3.

Image technical details, 2 nights imaging sessions:
Lum- 60x120sec, bin 1x1 @ -10deg C` cooling.
R- 19x300sec bin 1x1 @ -10deg C` cooling.
G- 19x300sec bin 1x1 @ -10deg C` cooling.
B- 19x300sec bin 1x1 @ -10deg C` cooling.
Ha- 6x600sec bin 1x1 @ -10deg C` cooling.
Total integration time for subs: 7h,45min.
100 Bias, 30 Flat, 20 dark, were added and combined for each filter.
Slightly cropped- 2743x2184 res.

Equipment details:
Scope- Tak FSQ85EDX
Plus QE 0.73X reducer.
Mount- iOptron IEQ45 Pro.
Camera- Starlight Xpress Trius SX694 mono & SX Filter Wheel.
Filters- Astrodon 36mm unmounted E series Gen2 LRGB-Ha.
Guider- SX Lodestar x2 & SX OAG.
Power & data control: Pegasus UPBv2.
Focus control: Pegasus stepper motor v2 kit.

Software details:
Camera & mount control- SGP via Ascom.
Guiding- PHD2.
Sky chart- SGP Frame and Mosaic tool.
Mount main control- iOptron via Ascom.
Registration, Calibration & stacking images- Maxim DL5
Processing- PS CS6.
Tags: nebula
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