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First night - missed the target and took lots of images of some nearby stars
Second night - 35 x 2 min
Third night - 60 x 2 min
I've tried stacking the two nights separately and all together to give a total of 3 hours, but the stacked images all turn out roughly same. Think I must be limited somewhere else and the extra data isn't being captured. The best of the batch was a very quick process of night 3, 2 hours. I was happy to see the bubble shape and a bit of cloudy bits 👍
Bresser AR 102/600 - Bresser HD camera - Stacked in Siril, simple process in Pixinsight
Here's a close-up of the chain of dark clouds of the Rosette Nebula using public domain data.
I've used IPHAS survey H-alpha as luminance with a colour layer derived from the Digitized Sky Survey red/blue channels (transformed to a SHO style turquoise/gold colour layer).
My own 8'' GSO RC version (last image below) was the inspiration (shown for low-res comparison).
Some people see "animals" formed from the dark clouds... I see a leaping jaguar top right (or spanner!) and an ostrich bottom left.
The tiny dark circles to the left of the jaguar's head are referred to as globulettes in Gahm et al (2007). The smaller circles are estimated to have masses of about 1-2 times that of Jupiter and a radius of about 2,000 AU and are speculated to result in the formation of free-floating interstellar planetary-mass objects.
-Photoshop (with Google Nik Collection for output sharpening and noise reduction)
-Defect cleaning from the IPHAS frames, stacking and mosaic re-mapping using my own software (which occasionally seems to work)
-Again, my own processing software to do the red/blue to SHO-style colour mapping and also to make a local contrast layer
-H-alpha survey from the 2.5m Isaac Newton Telescope (www.iphas.org/data.shtml), 120 second frames
-Red and blue from the ESO Digitized Sky Survey archive DSS2 (archive.eso.org/dss/dss)
-Star colours from GAIA DR2 Archive (gea.esac.esa.int/archive)
Unprocessed data here
By Alfredo Beltran
This is my version of the Rosette nebula using the Hubble and taken with the ASI071 OSC camera. Telescope was a C925 EdgeHD with Hyperstar lens.
Exposure time: 4hr 50 min in total at unity gain
2hr 00 min (24 x 5 min) Ha
1h 15 min (55 x 5 min) OIII
1hr 35 min (19 x 5 min) SII
This setup is awesome. A few years ago such an image just could’ve been taken with a monochrome ccd.
I spent Friday night collecting 13 hours on the well known Bubble nebula (NGC7635) together with two less known emission nebulas, Sh2-159 (down to the right) and NGC7538 (upper right). Aladin Sky Atlas gives no name for the black nebulosity in the centre.
RGB collected with Esprit 150 and ASI071 (75 x 5 min). Ha collected with Esprit 100 and ASI1600 (27 x 15 min, Baader 3.5 nm Ha). Both side my side on the Mesu200 in my obsy. Ha added to the red channel in blend mode Lighten as 50%.
The Bubble nebula came clearly out as more bluish-red than the others so expect there may be quite a bit of Oiii in it.
Clouds moved in at 0100 and they have apparently decided to remian for at least a week.....
In an effort to improve on my image of the Bubble Nebula from a few years ago, I decided that my existing data needed a longer integration time...... so at a total integration time of just over 26 hours here's the result. The image, taken with my Esprit 150, is an LRGB rendition with an Ha blend into the Red and Lum channels. I was particularly interested in seeing how much detail I could extract on the bubble itself, so I decided that it looks best cropped.
LIGHTS: L: 33, R: 27, G:27, B:23 x 600s, Ha:16 x1800s, BIAS:100, DARKS:20, FLATS:40 all at -20C.