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IC 1871 – Part of the Soul Nebula
IC 1871 is a very busy region of the Soul Nebula, Sh2-199. The Soul Nebula itself is often referred to as IC 1848 but in fact, this is the designation of a star cluster within the nebulosity. The Soul Nebula is located within the Perseus Arm of the Milky Way in the constellation Cassiopeia at a distance of around 7,500 light years from the Earth with IC 1871 situated on the north-eastern edge of the nebula.
IC 1871 is rich is Ha emissions but less so in OIII which makes this region an ‘interesting’ challenge especially for bicolour imaging as displayed here, despite there being other regions within the Soul Nebula where there is a greater density of OIII emissions. If I could afford a 3nm SII filter, I would have used that too but I can’t so I didn’t!
The nebula also plays host to some fascinating dust lanes that produce some great additional features to contrast against the bright ridges of glowing gas clouds. Within these gas clouds, large cavities have been sculpted by radiation and winds from the region's most massive stars. The dense star-forming clouds of IC 1871 are an example of ‘triggered star-formation’, a theory that suggests that the compressed edges of the cavities caused by the outwards push of the radiation and wind cause the region to produce successive generations of new stars.
Mount: Mesu 200
Telescope: Sky-Watcher Esprit 150
Flattener: Sky-Watcher Esprit specific
Camera: QSI 683 WSG-8
Filters: Astrodon 3nm Ha, 3nm OIII
Subframes: 15 x 1800 sec Ha, 28 x 1800 sec OIII
Total Integration: 21.5 hours
Control: CCD Commander
Capture: MaxIm DL
Calibration, Stacking and Deconvolution: PixInsight
Post-Processing: PhotoShop PS3
02° 59' 41.0"
+60° 41' 4.0"
By Anne S
I've been imaging Thor's Helmet for the last couple of nights in Ha and O3. I notice that RGB data can be used to correct star colour. What exposure is recommended to capture the stars and how many should I take? It looks as if I've one more clear night for the time being.
This came as a bonus target, I didn't really plan to shoot it, but I took the opportunity to grab some frames before astrodark or with the DSLR or waiting for other targets
So this is a mix of everything:
10x2min Ha with the ASI1600 and 130PDS on the AZ-EQ5.
11x3min Ha with the ASI1600 and Esprit80 on the AZ-EQ5.
19x5min Ha with the ASI1600 and Esprit80, 11 on the AZ-EQ5, 8 on the EQ6-R.
15x5min Oiii with the ASI1600 and Esprit80 on the AZ-EQ5.
74x90s with the DSLR and 130PDS on the AZ-EQ5.
For a total of 5:34h.
Crop of RGB, HOO and HOO-RGB.
Which are your thoughts before I call it the final version?
Disappointing weather so far this week, but a short run on the Owl has been a good test of getting the most out of not enough data! I was very pleased and surprised to find some outer shell in just 6x15 minutes of OIII. This also had 4x10 mins per colour and 9x15 mins Ha, so not quite 6 hours all in. In adding the NB I've tried hard to retain the original colour.
Had I had a sound recorder I could have presented this in multi-media mode because, throughout the night, a Scops Owl was sending his monotonous electronic beep up from the valley.
I think what this now needs is some binned OIII to nail that outer shell and some Lum for the faint fuzzies.
TEC140 triplet Apo, Atik 460 mono, filters all Baader except for an Astronomik OIII, Mesu 200. Processed in AstroArt, Pixinsight, Registar and mostly Photoshop CS3. This is a crop.
M97 The Owl Nebula in Ursa Major imaged 04.05.2018
William Optics FLT-110 refractor and Atik 314L monochrome CCD with Baader narrowband filters
10 x 300 seconds H-Alpha, 10 x 300 seconds H-Beta and 10 x 300 seconds OIII
Assigned to R, G & B channels respectively to give a false colour image.