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Here is the Eastern Veil Nebula (NGC 6992/5), part of a large supernova remnant found in the constellation of Cygnus. You are looking at the wispy leftovers of a star 20 times more massive than our sun which exploded some 8000 years ago.
- Sky-Watcher 200PDS telescope
- HEQ5 Pro mount
- ZWO ASI1600MM camera for capture
- ZWO filter wheel, Ha and Oiii filters
- ZWO 120MM camera for autoguiding
- ZWO finder-guider guidescope
- Artesky flats box
- 6th September 2019 from my garden in Glasgow, Scotland.
- 50x120sec with Ha filter, unity gain
- 50x120sec with Oiii filter, unity gain
- 20 flats each filter and 20 darks
- Controlled using Sequence Generator Pro
- Stacked in Deep Sky Stacker
- PixInsight dynamic crop, dynamic background extraction, pixelmath (to produce bicolour HOO image), colour calibration, SCNR, histogram transformation, curved transformation, star mask and star reduction, TGV denoise
- Final denoise with Topaz Denoise and some touch ups in Lightroom.
- More time on the target (less clouds).
- Addition of comma corrector to my imaging train.
- Create mosaic of the wider Veil nebula area.
- Improve PixInsight processing workflow.
Pickering’s Triangle (Seimis 3-188)
It is a little early in the season to be imaging this object as it didn’t appear above my local horizon until 00:50 when I started the project earlier this month but with nights getting shorter as we approach the summer solstice, it made sense to make an early start even though it took several nights to capture the data while ducking and diving between the clouds and early morning mist!
Pickering’s Triangle is part of the supernova remnant known as The Veil Nebula in Cygnus. The Veil Nebula itself was discovered by William Herschel in September, 1784 but this faint region was only later discovered photographically in 1904 by Williamina Fleming at the Harvard Observatory. The discovery was made post publication of the New General Catalogue (NGC) so it isn’t included in the catalogue. Although it wouldn’t happen today (I hope!), the custom of the time was to credit the discovery to the lead astronomer, in this case Edward Charles Pickering, the director of the observatory.
Mount: Mesu 200
Telescope: Sky-Watcher Esprit 150
Flattener: Sky-Watcher Esprit specific
Camera: QSI 683 WSG-8
Filter: Astrodon 3nm Ha and 3nm OIII
Subframes: 6 x 1800 sec Ha, 13 x 1800 sec OIII
Integration: 9.5 hours
Control: CCD Commander
Capture: MaxIm DL
Calibration, Stacking and Deconvolution: PixInsight
Post-Processing: PhotoShop PS3
The nebula can be found in the north-west quadrant of the Veil Nebula near NGC 6974 and 79 (see whole Veil Nebula image below). Lying around 1,400 light years away, the beautiful filamentary elements are the expanding shock-wave from the progenitor star that went supernova here somewhere between 5,000 and 10,000 years ago.
Position within the Veil Nebula
Visually, the nebula responds well to the use of an OIII filter as the region is rich in OIII emissions as can be seen in the blue/green filaments in the above images.
Photographically this is a wonderful object that responds well to both LRGB and narrowband imaging and the example shown here was captured using Ha and OIII filters. Although there are sulphur emissions (SII) in this region, this object responds well to my favourite imaging method of 'bi-colour’. This process uses just Ha and OIII filtration wherein the OIII data is mapped to both the ‘Green’ and ‘Blue’ channels and the Ha is mapped to the ‘Red’ channel. The greyscale images below show the individual Ha (left) and OIII (right) images used to produce this image. As you can see from the 'Stats' above, I have a whole load more Ha to collect to complete the image!
The individual Ha and OIII images
The Veil Nebula is a diffuse nebula located in the northern constellation Cygnus, the Swan.
Also known as Witch’s Broom Nebula, Bridal Veil Nebula, Cirrus Nebula, or Filamentary Nebula, it constitutes the visible parts of the Cygnus Loop, a supernova remnant in Cygnus. It is located at an approximate distance of 1,470 light years from Earth.
In this wide shot you can see the three main parts: the Eastern Veil, the Western Veil, and Fleming’s Triangle (Pickering’s Triangle).
Full resolution: http://www.celestialpixels.com/Nebulae/i-zcwHVLh/A
Telescope: Telescope: TAK FSQ85
Camera: QSI 683
Filters: RGB + Ha + O3
Total Exposure: 12h
Location: Mt Parnon @ 1430m. Greece
By Davide Simonetti
It's always fun to image a new target and it was worth using a rare trip to a place with much darker skies (Kelvedon Common in Essex) to try something a bit more challenging. This could have done with more exposure but nights are short at this time of year and dawn put a stop to the session.
29 x 120 second exposures at 400 ISO (58 minutes integration time).
12 x dark frames
79 x flat frames
21 x bias/offset frames (subtracted from flat frames only)
Captured with APT
Guided with PHD2
Processed in Nebulosity and Photoshop
Skywatcher EQ5 Mount
Orion 50mm Mini Guide Scope
ZWO ASI120 MC imaging and guiding camera
Canon 700D DSLR
What with holidays, poor weather and work commitments, it's been a little while since I've had the chance to do some observing. With the nights really starting to close in again the opportunities are starting to present themselves again. Last night was crystal clear and so I decided to get my SW 100p out and have a view of the veil nebula with my OIII filter. I had used the 100p to view sections of the veil with a 20 mm EP in combination with the OIII filter but last night I wanted to try my 32 mm EP to see how much I could fit in to the field of view. Sure enough, after setting up on the Western Veil (NGC 6960) I could see the wisps of the broomstick without too much difficulty. I then slewed across to The Eastern Veil (NGC6992) and its arc was very well defined and comparatively bright. A quick adjustment placed the full complex, East to West, in the field of view and even Pickering's Triangular Wisp was clearly visible. It was fairly mesmerising to see the span of the full nebula and, although it lacked the detail that I can extract with my 200p, the view with my 100p is very rewarding and the simplicity of the small dobs base making the scope almost effortless, and fast, to set up and use.