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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
When you have a lot of fun stuff you always think, is there another way I can use it ? I bought recently an used GoPro Hero5 Black camera. It's excelent to do time lapse movies with. But could it be used for astrophotography ? I have in mind doing time lapse of meteor showers. When I use my DSLR with a mechanical shutter I use 1/100 of its life time every night I use it for time lapse. With the GoPro camera there is no mechnical shutter, but will it be sensitive enough ? A very rough estimate is that it only have 1/10 of the sensitivity per pixel. But I'm curious, I want to test it.
I collected some information here and test that I have done:
At the end a link to last night Perseid meteor shower. And it really works, but only catch the strongest meteors, but the camera is small and I can have it in my pocket so very easy to bring out in the dark and setup.
By moe mountain mike
i have an ancient watec 120n (more about that later) but recently i purchased a ZWO AI120MC. i use a Computar 5 mm f/1.4 lens, sky studio pro software( interfaces with ZWO windows driver, cool!), xvid codec, 4 second integration. no guiding (of course). pointing at a circumpolar point north by north east approximately 45 degrees declination.
i have been influenced by security and dash cams capturing, inadvertently, fire balls. why not do it on purpose? i have been for a few years now. sure, i capture meteors but mostly i get jet aircraft, satellites and...
i upload videos to my youtube channel. everyone is invited to check them out.
i also have orion all in one and an astroscope image intensifier on canon t1i and t3i.
it is my opinion that there are more short dim meteors than long bright ones. there are more satellites than meteors and more jet aircraft than satellites. something else...you foe? cloudy nights? check out my star field time lapses.
youtube, what can i say? full screen in darkened room, make sure the gear has HD in red, click and select if not. find an intriguing clip? get a youtube down loader for best quality on your local drive. try adjusting play back speeds.
Taking full advantage of a series of clear nights, I couldn't resist some wide-field shots of the sky. Seeing was reasonably good, if not perfect, a few nights after full moon. The temperature was a little cool but pleasant. Here are the fruits of my labor:
Orion, 1 second exposure, f/5.6, ISO 1600:
Auriga, 2 second exposure, f/5.6, ISO 1600:
Canis Major, 2 second exposure, f/5.6, ISO 1600:
Leo, 5 second exposure, f/5.6, ISO 1600:
The Great Bear, 5 second exposure, f/5.6, ISO 800:
NGC 4051 is a spiral Sifert galaxy in the constellation Ursa Major, at about 48 Mly from earth. It covers about 5 x 4 arcminutes of the night sky The core of this galaxy contains a supermassive black hole.
Data from the Liverpool Telescope, La Palma (2 m aperture and 0.28 "/pixel resolution)