This is an attractive HII region surrounding a young, luminous open cluster in Monoceros. The open cluster is designated NGC 2244, whilst the nebulosity is designated NGC 2237, although some of the subsections have their own NGC numbers.
This image was taken with a Canon 60Da (Astronomik CLS-CCD filter) mounted on an Ioptron ZE25GT mount. A 300mm f4 IS L lens was used at f5.6. 15 x 90 second subexposures were combined to give a total exposure length of 22.5 minutes. 20 dark frames were used to subtract thermal noise and library bias and flat frames were also subtracted.
Open clusters NGC 2252, Collinder 107 and Collinder 104 are also visible in the wide angle image.
A closer view of the Rosette nebula
The Rosette nebula (NGC 2237) in Monoceros is a HII region surrounding a central open cluster NGC 2244. Its very difficult to spot the nebulosity in a suburban backyard scope.
You might remember that I tried to take a shot of the supernova in M82 but gave up after just a couple of exposures when it got cloudy. I also mentioned that it looked very small through a 300mm lens.It was a lot easier to see through my 2000mm Nexstar 8SE.
Well, the weather has been so awful that I went ahead and processed one of those images anyway. More to say Ive imaged it rather than anything else. So here is a single 30 second sub of SN 2014 J in M82!
A single 30 second exposure of M82. 300mm f4 lens
It was almost good enough to bring a scope out tonight. Bit too much wind and cloud. Still, nice views of the usual winter stars. Cant wait for a decent, clear evening.
First night out with the Ioptron ZEQ25GT equatorial mount. I’ve shied off using an eq mount because I thought polar alignment would be difficult but in the event it was quite straightforward. There is a nice illuminated polar scope and adjusting the axis in RA and Dec planes is simple. A handy iPAD app tells you exactly where to place Polaris in the scope.
One thing I would recommend, I bought a Draper gardening seat/kneeling pad. This is a lightweight reversible pad that functions as a chair when one way up and as a kneeling pad with handles the other way up! It would have been uncomfortable to sight through the axis/polar scope without it.
I set up a Canon 60Da and a 10×60 finder on a vixen cross-mount, balanced the scope and set off.
By this stage, it was getting distinctly cloudy (there was rain and sleet later!) but I was able to run off 16 x 30 second exposures and 9 x 60 second exposures of the Pleiades. Normally with an AltAz mount, I would have to discard about half of my 30 sec exposures due to movement artefact and all my 60 sec exposures but everything was spot on.
I had a quick look at Supernova 2014J in M82 – M82 was very small in a 300mm lens but the supernova was just visible. Clouds prevented any imaging.
Loaded with Canon 60Da/300mm f4L lens and 10×60 finder.