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Showing results for tags 'north american nebula'.
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Hey guys Here's a quick couple of WIP projects i have on the go. The NAN and NGC 7822. Just Ha for now, still need to capture the OIII. The NAN one is a bit of a long-running saga for me. I first tried to image it on my 2nd light of the newly-modded D5300 and Ha filter back in early October. Got a small number of cloud-affected subs before the clouds rolled in for good. Then tried again in mid November and the same thing happened again. It's been obscured for me since, due to the neighbour's house, but it's now visible again (just) although it's very low on the horizon and i need to stay up Very late to get it, so i tried yet again in late March and did get a decent amount of subs this time, although i've now realised that imaging at super low altitudes is not something i plan on ever doing again, as the guiding is not great and image quality is nowhere near as good as at higher altitudes. Things did improve once it got over 20 degrees, but it still wasn't brilliant tbh. As for NGC 7822, i captured this one just last night, April 5, between midnight and 3 am. Was in bed for 4:30 then up again for work at 7:15, so, err, today was fun, lol. When i realised it was going to be clear i frantically went on to DSO-Browser to try and find an Ha-friendly target, as there aren't many about these days, and the moon was coming up shortly after 01:00, so i was glad i discovered this one in the end. Hopefully it has enough OIII to make a good Bi-Colour image. I have until the end of the month to try and get it, fingers crossed. NAN: a little over 7 hrs in total. 7 x 480s, 6 x 1200, 13 x 1200. Stacked them all in APP using the 'Quality' setting. NGC 7822: 3 hrs in total. 9 x 1200s. Also stacked in APP using the 'Quality' setting. No real processing done on either, aside from a stretch and gradient reduction (for NGC 7822). I'll update the thread if i manage to get the OIII for either in time.
NGC7000 (North American nebula)Well known emission nebula in Cygnus constellation.Finally after few weeks I've managed to test my new AZ EQ6 mount under fairly good sky in Firle area.Heavier than HEQ5Pro but more sturdy and well machined mount.Scope: Skywatcher EVOSTAR 80ED DS-Pro Mount: AZ EQ6-GT Camera: QHY168C Filter Optolong L-PRO MAX Luminosity Guiding camera: ZWO ASI120MC Guiding scope: SW 9x50 finderscope 24x300s exposure at -10°C (120min total) binning 1x1 20x darks 30x bias 20x flats Another version with added H-alpha frames in more autumn palette. Colour - 24x300s exposure at -10°C (120min total)H-Alpha - 12x300s exposure at -10°C (60 min total)180 minutes together.
Here is the North American Nebula in H-Alpha. This is only 10x 800sec with the ST10 which is a H-Alpha hoover, it simply suck-up H-Alpha since this is where it is most sensitive, approx. 60%!!! This is also the first image from the BabyQ and it has performed fantastically. I have never seen FWHM values consistently well below 1 before now, not even with the TOA130F. At my location narrow band imaging is a lot better than RGB, I simply get too many issues using broadband filters.... Unfortunately, the good weather has gone to be replaced by the rain! The second image has an additional contrast stretch and sharpening applied in PhotoShop. There is a little too much noise but its due to the fact that my DARKS at taken at -20Deg.C and the camera's thermo-electric cooler was struggling to get below -15 Deg.C due to the hot sticky nights lately.
Hey-ho So then, just as i thought the DSO season was well and truly over for me until late August/early September, as it turned out last Saturday night (May 5th) was mostly clear, so i set about trying to finish the NAN image i had captured in Ha a while back (see thread below): So all i needed was some OIII. It's obviously not the ideal time of year to capture this i know, as it's so low on the horizon, but beggar's can't be choosers so i tried my best to make the most of the small amount of astro dark time available and just make the best of it. In the end i managed 9 subs, two of which were sub-standard due to passing clouds, but as is my want these days i still asked APP to stack them (using the Quality setting) and it didn't seem to affect things. So in total this is: Ha: 7 x 480s, 6 x 1200, 13 x 1200 (a little over 7 Hrs) OIII: 9 x 1200s (3 Hrs) RGB (with IDAS-D1 filter): 20 x 60s The usual Flats & Bias, stacked in APP and processed in PS. Gear used: Nikon D5300 (modded); SW 80ED (510mm FL); HEQ5-Pro; SGPro and PHD2. The RGB subs were used solely for the stars. I still need to get better at merging them with the NB channels, i'm not as good as i'd like to be at controlling them. Although in this instance, i did mask the stretching of them, and it definitely helped, but i need to practice this to get better at it. I think the fact that the RGB stack (even at just 20 mins) contained some nebulosity didn't help things. When it's just stars and nothing else, it's so much simpler to combine them. So this is just a Version 1 for now (i'll try an sSHO next). I used Ha for Red, OIII for Blue, and used one of Carboni's Actions to synthesize the Green channel. Then went round and round in circles trying to find a colour balance to my liking (on my rubbish monitor!) so i'd love to hear what you guys think. Too dark? Too much saturation? (i tend to do that, lol). I also couldn't decide on orientation, so have included two different ones. Which do you guys prefer? All C&C welcome. Don't hold back! I'm always looking for ways to improve. Clear skies!
As I was having some good observations of nebulae last week, it was striking how different those in the same class appear. This makes me wonder if our eyes can pick up some of the subtle nuances which these fantastic objects have one from another. Are we only bound to varying shades of grey due to surface brightness, conditions etc or can we make out more color? For example, to my eye not all emission nebs look the same. When viewing the North American last week conditions were such that the Gulf of Mexico region was in fantastic contrast. The Nebula was a picture of diffused cotton which I jotted in my notes as not "white" light. Comparing this with a view of the Swan is striking. The Swan makes me think of a shaft of light and is one of the most intensely white nebs I've viewed. The Swan is a bright piece of glass whereas the NA is a deep smoke-like plume. Of course pictures show tremendous differences, and the NA is one of those reddish looking ones much like the Rosette and Pelican, or IC410 in Auriga (which was a very dim smoke), which are quite different from the white/blue hues of the likes of Orion. Planetary nebulae are perhaps easier to distinguish visually because they often have a higher surface brightness and we can sometimes achieve a little color perception. The Eskimo and the Blue Snowball really come through. I compared the mammoth Helix with the Ring Nebula and these two are very similar in structure. Visually, they are not alike for the very good reason that the Ring is at least three times further distant from us. The Ring makes me think of a mirror when I view it. The Helix on the other hand is most elusive and the introduction of any medium magnification washes it away almost completely. Just some thoughts and reminiscences on a rainy afternoon about last week's haul! I can't comment on reflection nebulae as I've not been so lucky to see one. The Eagle Nebula looked nice and bright and I'd say that the Lagoon always makes me think of that wondrous Orion Nebula! The Veil was superb with all three major components easily within view. The Eatern Veil gives the impression that a light is falling on that huge globe from an outside source. Magical impressions on a summer nebulae session that ended with views of wintry Pleiades and Orion rising Clear nebulous skies!