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Showing results for tags 'ursa major'.
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NGC 2841 in Ursa Major
stevewanstall posted a topic in Imaging - Deep SkyA 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. Wikipedia: 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
My first time lapse
Maxrayne posted a topic in Imaging - Widefield, Special Events and CometsSo I was out the other night collecting images for a star trails of Ursa Major over the top of my daughter's tree in the front garden. Out of curiosity more than anything, I thought I'd give time lapse a shot. The attached is low res as I'm still messing around with what codec etc works best. The original avi file was pushing 8gb for 7 seconds!! Managed to get it down to 22mb but can't find anything inbetween. I'll keep playing though. Original raw files cleaned up in Lightroom, then exported out as Jpg's into After Effects. The trails image used the same Jpg set but was put together in Star Stax. As pretty much first attempts at both, I'm happy. EXIF: Nikon D5300, 18mm @ f / 3.5, ISO 800, 162 x 25 seconds Millie's Tree & Ursa Major Timelapse Test.avi
NGC 4051 with faint halo
wimvb posted a topic in Imaging - Deep Sky
This is my first ever "completed" image, as in stacking and processing it with PixInsight. Camera: Lumix GF1 Lens: Rokkor 55mm @f8 Mount: Skywatcher Star Adventurer Date: 10-01-15 Moon: about 80% Target: Ursa Major 40 Lights (60") ~ 20 darks ~ 20 bias ~ no flats Location: Hampton Wick Here's a link to the solve: http://nova.astrometry.net/user_images/532917#annotated I used the batch processing script in Pixinsight to stack the images, this was a 100% success, not a single error. As for the processing, I used the following link: http://lightvortexastronomy.blogspot.co.uk/2013/12/tutorial-post-processing-pixinsight.html To be honest, I have lost my patience a little bit and haven't done all the steps from the above link. I seem to have quite a lot of hot pixels still showing, no idea yet how to remove them correctly. What I'm after really from you guys is to dissect this picture, let me know what you think of it. I'm open to all comments please, the more the merrier. thanks for your time.
Second light report for my Flextube 300p
mountainmadman posted a topic in Observing - ReportsGood evening everyone. This is my second light report using my SkyWatcher 300p Flextube. First light was a bit of a rush because the opportunity came without much notice. This time however, I had a bit more time to plan. As you can see, it went well. Very well. I’d been looking forward to Sunday evening for quite a few days. Throughout the latter part of last week, the weather forecast was suggesting that the skies would be clear for a good deal of the afternoon and through into the small hours. The only issue being, work would get in the way on Monday morning. So, in plenty of time, I set the scope up outside whilst it was still light, and then came to wait until darkness. I used that time to get a few more ideas on what I could target for the evening. Following on from first light for the SBT on the 21st, I decided that I would quite like to get back to the constellation of Leo. I also decided that Gemini would be a good area to explore. Armed with my notebook, Telrad chart and pocket atlas, I headed out to the garden and sat in the dark for a while before putting the Telrad on the scope and getting everything lined up. To Leo. I wanted to make sure that what I had seen during first light of the scope was true. I still couldn't quite believe what else was visible through the 12” mirror in comparison to the 6”. I made a note in my book about the seeing. Though not brilliant, it was still the clearest sky around here for quite a while. My first target of note for the evening was NGC 2903 which is a spiral galaxy of magnitude 9.6. I found the target quite easily using the Telrad. However, I couldn't really see much structure if any. A faint fuzzy it certainly was. Around my observing point, there were various lights being switched on and off by the neighbours as people began to settle down for the evening. I think without this minor interference, I could have seen a lot more. The back garden does actually get very dark once people have settled down and gone to bed. Unfortunately, I didn't have the luxury of a late night so it will be a target to revisit in better conditions. Next in Leo, I paid a visit to M65 and M66. They appeared exactly as I remembered them. Both easily visible in the same FOV through the 32mm EP, but again without too much detail involved. Then, I thought it would be worth a quick view of a target visited many times before, M44 The Beehive Cluster. It was pleasing to see it again and is certainly much richer with the aid of the 12” mirror. Having spent a bit of time looking around Leo, I paid a quick visit to Gemini and the cluster of M25. A pretty target that really filled the EP. Not as bright as M44, but still very well defined. I decided to take a seat for a while, and under red torch light, flicked through the atlas and just gazed around the sky spotting as many stars as possible in the constellations of Leo and Hydra. Sometimes, I find it just as relaxing and enjoyable and when it comes to finding targets, a bit more knowledge always helps! Then, it was time to look at the constellation of Ursa Major. Nice and high in the sky, the pocket atlas shows many targets that I've tried for but not managed to locate in the past. M63 was on the list, technically in Canes Venatici, but kind of in the right area of the sky. I’m afraid to say again, probably because of local light pollution and poorly adapted night vision, the target was nothing more than a grey smudge for me. But, it’s definitely whetted the appetite for a revisit under darker skies. While in that locality, I nudged the SBT on to M51, the Whirpool Galaxy. For me, this was probably the best target of the night. Not really appreciating what it looked like from a photo, I made a note in my book that I could see two distinct light spots very close to each other. They didn't look like two completely independent objects given the light areas that seemed to join them. In my mind, I recalled an image I have seen in a magazine of what looked to be a spiral galaxy almost consuming a neighbouring galaxy. I wondered if this is what I was looking at. I was really pleased when I verified what I thought I saw when I came back indoors and saw a similar image on stellarium. What a cracking sight that was. I felt like I was on a bit of role, so I decided to go for two more targets in Ursa Major before calling it a night. The first was M109. In stellarium, it’s referred to as the Vacuum Cleaner Galaxy, a new one on me. Because of its proximity to the star Phecda, I found it very easy to locate, but quite tricky to distinguish. I found it easier to nudge the scope a little so Phecda wasn't in the field of view. This meant that M109 was now towards the edge of the field of view, but it meant that the comparative brightness of the star wasn't detracting from the image of the galaxy. Finally, a little further nudge towards Merak brought the final target into view, M108, the Surfboard Galaxy. In the Telrad charts, it was given as a magnitude 10 object. The first mag 10 object I’d been able to find in my short hobby time as an observer. In the faint grey colouring of the galaxy, I thought I could make out a very small single pinprick of light that stuck out quite well. I assumed this to be the core of the galaxy. So all in all, a very enjoyable and exciting observing session that brought a raft of new objects to my tick list. Whilst I’m sure the scope is capable of so much more again, especially with some mods including a shroud and possibly flocking, it really is demonstrating its brilliant abilities under my ‘back yard’ conditions. As you might have noticed, there was no mention of changing EPs during the session. I made a conscious decision before I started that I would use exclusively the 32mm EP. There are so many new combinations to now try on so many more targets that have now come within observational reach that I haven’t yet started tinkering with getting the best from each target. That will come in time. Thanks for reading.