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Rosette Nebula in SHO


Rex Robichaux

Rosette Nebula in SHO

In the spirit of upcoming Valentine's Day, here's my take at the Rosette Nebula resembling a rose from space. This was a blast to capture over the past week as we were treated to several clear nights over a week ✨ (that's essentially unheard of...). It's been a while since I've done a proper narrowband image with each filter so watching this come together in processing was really gratifying.

The Rosette Nebula is about 5,000 light-years away and can be found to the left of Orion in the constellation Monoceros (the Unicorn). The bright stars in the core of the nebula are known as NGC 2244 and contain several O Type stars. These are some of the hottest and brightest stars known.

This shot is in SHO where Hydrogen gas is mapped to green, Sulfur gas is mapped to red, and Oxygen is mapped to blue.
About 9 hours' worth of data went into this shot- 2.5hrs of Hydrogen, 2hrs of Sulfur, and 4.5hrs of Oxygen.Lastly, about 10 minutes of data were captured to retain natural star color and added back in at the end after it was passed through starnet++ by a friend for star removal.

Captured through my TSO 130, Zwo ASI294MCPRO Camera, Zwo narrowband filters, TS .80 reducer, all riding on my EQ6-R mount. Captured in APT, guiding with DSS, processed individually in Startools, combined in Photoshop, stars removed in Starnet++, final touches in Lightroom.

Dates:Jan. 20, 2021 , Jan. 22, 2021 , Jan. 23, 2021
50x10" (gain: 120.00) -20C bin 1x1
ZWO ASI Ha 7nm: 30x300" (gain: 120.00) -20C bin 1x1
ZWO OIII 36mm: 45x300" (gain: 120.00) -20C bin 1x1
ZWO SII 36mm: 26x300" (gain: 120.00) -20C bin 1x1
Integration: 8.6 hours
Darks: ~35
Flats: ~30
Flat darks: ~30
Avg. Moon age: 8.52 days
Avg. Moon phase: 61.67%
Bortle Dark-Sky Scale: 5.00

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