steppenwolf Posted May 24, 2018 Share Posted May 24, 2018 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! Discovery 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. Image Stats 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 Description 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 19 Link to comment Share on other sites More sharing options...
Scott Posted May 24, 2018 Share Posted May 24, 2018 Once again Steve, a lovely image accompanied by an informative report, Terrible the way underlings were treated back in the day 1 Link to comment Share on other sites More sharing options...
John Posted May 24, 2018 Share Posted May 24, 2018 Very nice image, object and back story Steve "Pickerings Harem" or the Harvard Computers as they were also known included some very skilled and talented women: https://en.wikipedia.org/wiki/Harvard_Computers 2 Link to comment Share on other sites More sharing options...
Mark at Beaufort Posted May 24, 2018 Share Posted May 24, 2018 Great astro photo and information Steve. This is one of my favourite objects using an O-III filter. I find that Pickering's (Fleming's) Triangle really needs a good dark site to see it visually. 1 Link to comment Share on other sites More sharing options...
simmo39 Posted May 24, 2018 Share Posted May 24, 2018 V nice image, just getting to love narrow band stuff. 1 Link to comment Share on other sites More sharing options...
tomato Posted May 24, 2018 Share Posted May 24, 2018 Great image and a wonderfully informative post. I have been trying to catch the tail end of the galaxy season with the recently set up Esprit 150, I only have a Ha narrow band filter but looking forward to trying it out on this target. 1 Link to comment Share on other sites More sharing options...
whatablanker Posted May 25, 2018 Share Posted May 25, 2018 Love the image. I will be doing the veil when to gets dark again. Like you said it rises far too late at the mo. I like the wide angle image. 1 Link to comment Share on other sites More sharing options...
steppenwolf Posted May 25, 2018 Author Share Posted May 25, 2018 14 hours ago, John said: "Pickerings Harem" or the Harvard Computers as they were also known included some very skilled and talented women Thanks for the link, @John 9 hours ago, tomato said: I have been trying to catch the tail end of the galaxy season with the recently set up Esprit 150, I only have a Ha narrow band filter but looking forward to trying it out on this target. You'll be in heaven with that combination - some of my favourite images have been mono using just an Ha filter. Galaxies have never really excited me as much as the dusty stuff which is another reason for diving in early with this nebula as soon as it started to rise! Link to comment Share on other sites More sharing options...
steppenwolf Posted May 25, 2018 Author Share Posted May 25, 2018 4 minutes ago, whatablanker said: Love the image. I will be doing the veil when to gets dark again. Like you said it rises far too late at the mo. I like the wide angle image. The wide field of view was captured with a 100mm Vixen VSD 100 (f3.8) Link to comment Share on other sites More sharing options...
whatablanker Posted May 25, 2018 Share Posted May 25, 2018 1 minute ago, steppenwolf said: The wide field of view was captured with a 100mm Vixen VSD 100 (f3.8) I'll be using my sigma 70 - 300 lens set at about 100 - 150mm. I don't normally use the scope between August and October as I like to catch the area around Cygnus in the summer. There is just so much to see. 1 Link to comment Share on other sites More sharing options...
Barry-Wilson Posted May 25, 2018 Share Posted May 25, 2018 Well done Steve on being the 'early bird' and not an easy task to guide at a low altitude. Lovely bi-colour. Now, just programme a masterful mosaic with your Esprit and we'll all delight in the end result ?! 1 Link to comment Share on other sites More sharing options...
swag72 Posted May 25, 2018 Share Posted May 25, 2018 A great image and a very insightful post with all the additional information... many thanks for that it's extremely useful for everyone 1 Link to comment Share on other sites More sharing options...
steppenwolf Posted May 26, 2018 Author Share Posted May 26, 2018 15 hours ago, Barry-Wilson said: Now, just programme a masterful mosaic with your Esprit and we'll all delight in the end result ?! With that lovely wispy tail to trace out it would be quite a few tiles! 11 hours ago, swag72 said: A great image and a very insightful post with all the additional information... many thanks for that it's extremely useful for everyone Thanks, Sara Link to comment Share on other sites More sharing options...
gingergeek Posted May 26, 2018 Share Posted May 26, 2018 Awesome example and write up, looks like you have a keeper of a setup now Steve ! 1 Link to comment Share on other sites More sharing options...
steppenwolf Posted May 26, 2018 Author Share Posted May 26, 2018 11 hours ago, gingergeek said: Awesome example and write up, looks like you have a keeper of a setup now Steve ! Oh yes, it's a keeper setup for certain. Link to comment Share on other sites More sharing options...
James Posted May 27, 2018 Share Posted May 27, 2018 Lovely image Steve and another great write-up! James 1 Link to comment Share on other sites More sharing options...
steppenwolf Posted May 28, 2018 Author Share Posted May 28, 2018 10 hours ago, James said: Lovely image Steve and another great write-up! Thanks, James Link to comment Share on other sites More sharing options...
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