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A very crisp and cold night. I added more luminance data and also collected some RGB for NGC 2841. There is now around 4 hours in L and an hour each in R, G and B. The subs are 114s at a gain of 139.
NGC 2841 is an unbarred spiral galaxy in the northern circumpolar constellation of Ursa Major. A 2001 Hubble Space Telescope survey of the galaxy's Cepheid variables determined its distance to be approximately 14.1 megaparsecs or 46 million light-years.
This is the prototype for the flocculent spiral galaxy, a type of spiral galaxy whose arms are patchy and discontinuous. The morphological class is SAa, indicating a spiral galaxy with no central bar and very tightly-wound arms. There is no grand design structure visible in the optical band, although some inner spiral arms can be seen in the near infrared.
The properties of NGC 2841 are similar to those of the Andromeda Galaxy. It is home to a large population of young blue stars, and a few H II regions. The luminosity of the galaxy is 2×1010 M☉ and it has a combined mass of 7×1010 M☉. Its disk of stars can be traced out to a radius of around 228 kly (70 kpc). This disk begins to warp at a radius of around 98 kly (30 kpc), suggesting the perturbing effect of in-falling matter from the surrounding medium.
The rotational behaviour of the galaxy suggests there is a massive nuclear bulge, with a low-ionization nuclear emission-line region at the core; a type of region that is characterized by spectral line emission from weakly ionized atoms. A prominent molecular ring is orbiting at a radius of 7–20 kly (2–6 kpc), which is providing a star-forming region of gas and dust. The nucleus appears decoupled and there is a counter-rotating element of stars and gas in the outer parts of the nucleus, suggesting a recent interaction with a smaller galaxy.
Equipment: Celestron 9.25 XLT at F10, Skywatcher EQ6 Pro GEM, ZWO 1600MM Pro, ZWO EFW with ZWO LRGB filters, QHY5IIC guide camera on Skywatcher 9 x 50 finderscope
Hi! So Ive found some pictures from an arxiv report in a database which I need for my project and converted them to fits files (The picture on the left). The one that was used in the arxiv report (picture on right) is a zoomed in picture of a galaxy in that picture, where its clearly visible. However when I try zooming in on the exakt coordinates of the galaxy in the fits image, its just plain black. I want the picture "raw", that's why I saved it as fits and not their pdf picture from report. Someone suggested first stretching the image for a more detailed image but some filters had to be used though... the only thing I can find on the tables of the images is that filter F160W was used. I have no idea how to move forward now, completely stuck. Would appreciate some help!
Today I finally edited some data I've had for a while. It's a widefield shot (50mm prime lens) that was used on a modified Canon 600D. The end result is about 50 x 3 minute exposures, ISO 800 f/3.5. It was also shot with an IDAS D2 light pollution suppression filter riding atop an iOptron SkyGuider Pro. The Eastern skies when I shot this are full of street lights so there were some nasty gradients.
I also realised that the camera lens pulls itself in when the camera is switched off, which meant that even though I'd taped the focus ring down, my focus had changed and I couldn't use flat frames anymore, resulting in the horrible dust motes. Ah well, show must go on! Speaking of flat frames, I have a video on them on my YouTube channel and a post on my website.
I hope you enjoy the photo. It was actually quite difficult to process in a way that doesn't destroy any details in Andromeda. Also, because it wasn't dithered there's a lot of walking noise in the image that also ruined definition.
Just... appreciate it from afar, and don't zoom in! 😂
I'm Jonny and I live in Farnborough in Hampshire, UK.
My friend and I are taking our first baby-steps into night sky photography so I'm here for all the help I can get.
We're just starting out so our equipment is very basic, but I'm sure the more we get into this the more we will upgrade over time.
Currently our set up consists of:
Home-made Motorised Barn Door Tracker (my friend is an engineer)
Canon 1100D with an 18-55mm Lens
Laptop with BackyardEOS
We took everything out for it's first test-drive last week and the tracker works really well. Even on very long exposures the stars remain as points and not trails so we were really pleased with how it performed.
I've attached what was probably our most successful picture of the evening. It' not amazing, but it's a start.
I would really love to get some photos of the Milky Way and I'm hoping you all could suggest some settings to use, imaging techniques to try out and equipment upgrades? We're on a bit of a budget but we have photographer friends from whom we can beg and borrow equipment.
Looking forward to chatting with you all in time.