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Hi everyone, To preface this post, this is technically not the first forum I've asked this question on, I just want to get the input of people on multiple platforms and see what everyone thinks. Now, on to the main post: In the process of looking through some models of our area of the galaxy, I came across a rather interesting, large, very faint nebula, seemingly nearly centered around the star Spica. After a bit of further research, I was able to find this singular Cloudy Nights post about observing the nebula, also showing image 1 (see question mark). According to my (very limited) research, however, this nebula does not appear to have ever been imaged by amateur astronomers (no results on this or any other website, and I have yet to find an image of the region showing the nebula), and apart from a few scientific papers like this one (also helpfully supplied by the CN post), does not appear to have been studied very much at all. So, just out of curiosity, has anyone actually imaged/seen images of/heard of this nebula? If not, do you guys think its a target worth going after? It is very faint and very large (20 by 18 degrees), so it's no surprise there's very few (if any) images of it, but the structure seems fascinating, nonetheless, and I wanted to get your guy's (you guy's?) opinions on it. - The0s  Another interesting paper This paper from 1961 mentions the nebula, stating that the nebula was not visible in Ha - later surveys show it is, but the nebula must be very faint |
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I was actually looking into this a few weeks ago. Planned on imaging it from dark skies on my route to the eclipse in TX but alas weather and plans changed. My original plan was to use a 55mm lens with my APS-C chip (QHY268m) with a 6nm HA filter @ F4. Thought about using a 12nm filter at f2.8 but figured since it's so faint and diffuse that the 6nm would have been the way to go. I would have also liked to get 18 hours of RGB (6 per channel) in order to get a clean continuum subtraction for the narrowband data. Again, it's going to be extremely faint. From intuition I decided I wanted to start with 20 hours of HA and go from there, likely needing at least 40-60. But alas, I never got the chance to go for it. I'll be busy with work until June so it looks like I missed the window. Hopefully somebody else will give it a go. I don't actually expect it to be very interesting, just a large red blob of diffuse galactic HA spread out around Spica. But you never know until you go for it. |
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| The fastest and shortest OTA I have is my Askar FRA400 with the reducer at f/3.9. It is mostly gathering dust along with my AM5. I can pair it with my full frame sensor / Chroma 8nm HA filter. Maybe I will use it to do this. That gives me 7.39x4.9 degrees field of view, which does not seem to be nearly enough. But maybe I will just mosaic it and see how it goes. Would give you full credit for the idea if I actually do it. I would need a 12 panel mosaic to just cover that field of view. |
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| A standard 85 mm lens would cover the area with a FF sensor and 55 mm with an APS-C sensor. |
