I first came across this interesting Camelopardalis galaxy, NGC2655 also classified as Arp 225, in October 2014, and collected several monochrome subs. But ran out of time and sky to finish the job. This has been a very poor season with few imaging opportunities, but the night of 16th February 2015 was beautiful, and although I had a previous engagement and wasn't able to start imaging until 22:30, I was able to keep going the rest of the night - the target is only 12 degrees from Polaris, so at my 55 deg latitude stays nicely high all night. The main body of the galaxy has very little structure - quite uninteresting. But what makes it special is the surrounding clouds of displaced stars. Difficult to bring out from the background - really needs a dark mountaintop! But I ended up with a total of 35 x 10 minutes Luminance subs, all binned 2x2. Colour is from 5 x 10 minutes binned subs for each of RGB. All with QSI 683wsg and Starlight Xpress AO on 10" RC Truss (2000 mm fl). Full Size. The central section of this image containing the galaxy appeared in the December 2018 issue of Astronomy Now in an article about Northern galaxies. |
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Abell 1656 is a densely populated galaxy cluster in Coma Berenices containing numerous small NGC galaxies as well as dozens of fainter PGC galaxies. NGC 4884 is the brightest at magnitude 11.5. I have labelled several of the brighter NGC ones in a 'mouseover' image, click on the thumbnail. 21st April 2015 was again a still clear night and I used the little TS Quad 65 for this rich field image which consists of 14 x 10 minutes Luminance unbinned, and 7 x 5 minutes each of RGB binned 2x2. QSI 683 camera. Close study of the Larger image will reveal many more tiny galaxies. |
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The run of fine weather in April 2015 continued for yet another clear night - 3 in a row!! Alas the Moon was starting to wax but the night of 22nd April was clear and steady, so I revisited the barred spiral galaxy NGC 4725 in Coma Berenices, previously imaged in 2007 with my Artemis camera. This bright (magnitude 9.3) galaxy is particularly unusual in having only one spiral arm. The smaller neighbouring galaxy is NGC 4712, and is unrelated, being much further away. QSI 683 on RC10 at f8. Luminance 10 x 10 minutes, RGB each 4 x 10 minutes, all binned 2x2. Off-axis guided with Lodestar X2 and Starlight Xpress AO unit. North approximately up in this orientation, governed by the requirement for a suitable guide star. |
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It's been a l o n g time since I imaged a globular cluster, and a particularly long time since I imaged Messier 5 in Serpens. That image is here. I have never before imaged Messier 10 in Ophiuchus. It follows M5 across the sky about an hour and 40 minutes behind. The night of 26th April 2015 was particularly clear and despite a bright first quarter Moon the sky away from the Moon remained decently dark. These bright globulars are a joy to image - only 2 minute subs needed so much of the star colour is retained. I had to wait a while for the targets to rise - they are quite low at my location, and for Messier 5 I perhaps went a bit over the top with Luminance at 20 x 2 minute subs, which left me a little short of time for colour and M10 data. But I persevered, and although by the time I had finished M10 I was half an hour into Astronomical twilight I could still easily see the Cygnus Milky Way in the clear air (the Moon had set by then). So M10 has 15 x 2 minute Luminance subs. For both globulars 6 x 2 minutes each RGB. All with the QSI 683 and SX AO unit, binned 2x2 on RC10 at f8 native resolution. |
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At my latitude, Astronomical twilight is now the best I get, and even that gives way to Nautical twilight for a few weeks at the height of Summer. So imaging is strictly limited to bright objects, or some narrow band subjects. But the brighter Globular clusters are still a nice target in Astro twilight, and the night of 12th May 2015 was particularly clear so a couple of hours were devoted to Messier 92 in Hercules. My previous image was taken in 2003, monochrome with an MX716 camera! So overdue for an update. The chip in that main imaging camera is now used in the Lodestar guide camera. How things have moved on! The old one was 40 x 20 second subs unguided on an LX90. The new one, Luminance 21 x 2 minutes, RGB each 7 x 2 minutes, QSI 683 on RC10 guided with LodestarX2 and SX AO unit. All binned 2x2. Full Size A bit of a difference! |
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After I'd collected that data, I had a quick look at M16, the famous Eagle nebula in Serpens. Only 5 x 10 minute binned 2x2 H-a subs as nautical twilight was fast approaching, but if there are a few more clear nights before I lose astro twilight I may get some more data. It's very low for me, never rising above 21 degrees altitude, so seeing is poor - I don't expect ever to get a crisp image here. But still worth a visit! Full Size |
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I'm quite enjoying these astronomical twilight nights - another beautifully clear one on 16th May 2015. A pity we couldn't have had more of them during the previous Winter. But although clouds arrived later and prevented me finishing my M16, I was able to complete a full set of data for Messier 12 bright globular cluster in Ophiucus (which I started three days previously). Replaces an earlier attempt in 2005. More colourful than I expected! Luminance 25 x 2 minutes, RGB each 7 x 2 minutes, all binned 2x2. QSI 683 with SX AO unit on RC10. Full size This image featured in the August 2015 issue of Astronomy Now magazine. |
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This image of the Pelican nebula, IC5070 in Cygnus, is the first image captured using my TMB105 refractor with the Teleskop Service TSFlat2 flattener which has enabled me to use the QSI 683 camera with that telescope - previously it would have been badly distorted in the corners. See the TMB page . The monochrome image is Hydrogen-alpha data using 20 x 10 minute subs binned 2x2, TMB 150, QSI 8300, Baader H-a filter from 6-7 August. The colour is mapped H-a to R, OIII to G and SII to B. The colour data, 10 x 10 minutes each OIII and SII was captured on the night of 11th August, but had to wait until 27th August for the Flats. Full sizes here: |
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