[Nebulosity 4.4.0 With Serial Key
Melvin Amey
A few days ago I posted about my struggle finding deep space targets. So even after continuing to try and find them, I have still run into trouble. So I have been trying to image easier objects. One of those is the North American Nebula. I figured it would be pretty easy to spot some sort of the nebulosity but was mistaken. I was able to spot Deneb in my photo but couldn't see any sort of nebula.
I really don't know if the issue is my exposure time, bright skies, or me just not finding the target I am begging to find. The exposure I took was around 20 seconds(I am in boatel class 7) and the image had an orangish-tinted background meaning that if my exposure were longer, I would start getting white-tinted skies. So would it just be an issue with my exposure time and having to bring out the image during stacking or would it be likely that I am completely missing the target.
You will not see any nebulosity with an exposure of 20 seconds even if your camera is modified. When I took images of the NAN I saw the nebulosity and was usinmg a modified Canon and the subs were 400 seconds. I think that you probably don't need quite such long subs as that but I suggest that you would need 200 seconds at least with a modified camera. The other way is to take many images (hundreds) at shortish exposures and stack them (lucky imaging).
I don't sort of agree with this. I have bortle 8 skies. My canon is modified. When framing the target I can see the nebula when doing a test 20 second exposure. So it could be other issues with the OP not seeing any nebulosity.
1) You will need to stretch the image to see fainter nebulosity. Are you familiar with stretching linear data? Some software will give you an automatic 'preview stretch' but usually you have to initiate a stretch yourself. If you capture into a PC you can use your capture software to do this. In their original linear form most astro-images look like stars on a very black background with little else showing.
2) You'll need to remove the LP gradient or orange washout. With modern software this is remarkably easy. Pixinsight's Dynamic Background Extraction lets you tell the software what should be neutral background sky (dark grey) in your capture and then, when applied, the algorithm re-balances the colour and lets the underlying details emerge. Alternatives to Pixinsight include Gradient Xterminator (Photoshop plug-in), Astro Pixel Processor, Astro-Art, Startools and more. You'll need a post processing software anyway so be sure to choose one with a good gradient remover.
With a T2I and a ZS61, and me assuming that a T2i is a crop sensor, if you see deneb in your exposure, its a good chance you have missed the NA nebula anyway (Tordapending on rotation), this is just from my experience of a crop sensor eos 800d and ZS61. To frame up your ZS61 to NA Nebula, I'm not sure on the exact vocabulary to use so Ill try and explain it as best as I can. But in Cygnus's current position in the early night sky, Deneb is above Xi Cygni (Which it should be if I am assuming right, with you being in the Northern Hemisphere), You should frame XI Cygni right at the bottom of your shot, this way you will have all of the NA nebula in your shot, but you will not see Deneb.
Here is also an example of a single shot on my unmodified 800D, 90 seconds exposure in a bortle 5 sky, compared to 1 hours data (If I remember right), stretched A LOT. As you see, if you didnt know NA nebula was there in the single shot, you probably wouldnt see it at all.
The final image is cropped, the single exposure is uncropped, as you can see both Deneb and XI Cygni is visible, but this is because Im using a Samyang 135mm at the time, not my ZS61. I just put these there to show you even in a 90 second exposure NA Neb is basically invisible compared to the finished product. So when framing objects like this, you've got to look for the positions of the brighter stars and compare to other finished photos of the NA neb, kind of like old fashioned manual platesolving ?.
I can't believe this. I had it in my frame and I thought it was just stars so I passed by the shot... I remember literally looking at the camera screen and seeing that heart shaped start outline at the bottom. Well I guess back to imaging...
I should be happy that i passed this kind of level with imaging, and i am even happier and lucky that i started with a mono cooled camera, but the bad and sad news that since i started in 2017 i didn't focus much on DSO and couldn't make much successful images, only recently i put my knowledge and experience towards it, but i still feel sad i wasted all those years, so i hope by now and later that i make much more results great enough so those years aren't wasted.
I did my last target of Pelican nebula, in SHO, happy so far, so i think i should be proud that i have equipment that helping me to do it, not sure if i will give that NA nebula a try one day, but hopefully i can get scopes or optics to capture both nebulae at once.
Wether this indeed is a true SNR, or not, is impossible to know with the currently available data. Spectroscopy or even narrow band observations (Halpha and SII, for example) will be needed to better classify this object.
I found these two nebulae when looking through SDSS images of the region surrounding planetary nebula candidate Pre 31. Pre Object 2 is an elliptically shaped nebula, with SDSS, Pan-STARRS1 colors of a cometary globule. The object is even well visible in DSS2-IR images, further supporting this classification. The nebula is weakly detectable in WISE, in the W3 and W4 filters. Pre Object 3 has all the same characteristics as Pre Object 2, but is fainter and lacks a WISE signal. This nebula I found in Pan-STARRS1 images while trying to find Pre Object 2.
In August and September 2017, a team of French astronomers found that one previously classified Planetary Nebula candidate was in fact a Galaxy, most likely a Seyfert Galaxy! The object is named Pre 24, and was discovered by yours truly in August 2016 using the online Digitalized Sky Survey plates.
The team consisted of Pierre Dubreuil ,Olivier Garde, Pascal Le D and Alain Lopez. Their mission was to confirm Planetary Nebula candidates via spectroscopy. Among eleven objects studied, seven were confirmed as true Planetary Nebulae, while the remaining four were found to be other objects. Among the latter were two galaxies.
I found this faint nebula in the Cassiopeia constellation, when hunting around in DSS and SDSS plates. The nebula is fairly elongated, with aWISE signal rather typical of a Planetary nebula, but its colour and morphology in SDSS and Pan-STARRS1 was more like one of a cometary globule. In DSS2-IR the nature was a bit more circular.
I found these two nebulae when searching for Planetary Nebula candidates in Cassiopeia, in the region around Planetary Nebula candidate PN Mul 8. Mul 8 was discovered only a few years ago by Lionel Mulato (France) using WISE data, but appeared very well in optical images, especially in SDSS. its colour in those images however are also in favour of a cometary globule (see image below).
Planetary nebula candidate PN Mul 8 as seen in SDSS data. Despite being a good candidate, its colour and morphology in SDSS is that expected of a cometary globule. Image credit: SDSS Aladin Lite.
Noticing that there might be similar nebulosity to Mul 8 in the vicinity, I decided to hunt for such objects. The first one I found was Pre Object 5, which layed just South of Mul 8. This object was very obvious in optical data, and has the WISE signal typical of a Planetary Nebyla. Unfortunatey though, its morphology, SDSS and DSS colours are more in favor of a Cometary Globule, hence its name.
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