Sharpless 275 - The Rosette Nebula

[dcrowson]

Sharpless 275 (CTB-21, Caldwell 49 and five NGC designations among others) is a large HII region located approximately 5,200 light-years away in Monoceros.

Ha – 12x1800s – 360 minutes – binned 1x1
OIII – 12x1800s – 360 minutes – binned 1x1
SII – 12x1800s – 360 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2

1200 minutes total exposure – 20 hours (for all the different versions)

Imaged from Dardenne Prairie, Missouri (a red zone) over seven nights in January and March, 2018 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.

SHO-RGB - https://www.flickr.com/photos/dcrowson/ ... 6/sizes/l/
HaRGB - https://www.flickr.com/photos/dcrowson/ ... 3/sizes/l/

See my previous LRGB image here - https://www.flickr.com/photos/dcrowson/8561319732.



Dan

[AstroBee]

Very nice Dan.
Wow, 30 minute subs... that take a lot of faith in the mount/guiding.

[Ken_nneth]

Great capture, I like the details you get with the long exposures.
Thanks for sharing
Clear skies
Kenneth

[BABOafrica]

I especially like the color and the detail in the outer reaches of the nebula ... not seen that often....


BABO

[Gordon]

Congratulations Dan on having your image selected as todays TSS APOD!

viewtopic.php?f=103&t=16709&p=140127#p140127

[yobbo89]

congrates on the apod!, i can give you my opinion , good pixel scale, tracking is good, focus perfect,the background sky glow can possibly be reduced with futher processing , flats or back ground extraction will improve on the gradiant in the background , it's a pretty sharp image, if you temporarily stretch the image very excessively you can find the edges of the stacking alighnments and then crop the image to cut out lower signal areas or "edge seams"

your image is almost on the money

[Makuser]

Hi Dan. A super Rosette Nebula in your pallet of light. I like the contrast and the wonderful colors and details in your capture. Thanks for sharing this with us Dan, and congratulations on winning the TSS APOD Award today.

[Greenman]

Congrats on a nice version the object and the APOD.

[AstroBee]

Congratulations on the TSS APOD Dan. Well deserved.

[MariusD69]

Wonderful images! Great work! Congrats for APOD!

[jthommes]

Excellent image Dan. I have not seen you do very much tri-color or bi-color narrow band processing - nicely done.

Congrats on the APOD.