I first attempted the very faint HFG1, PN G136.3+05.5 in Cassiopeia at the November Galloway Star Party 2022. Discovered in 1982, full name Heckathorn-Fesen-Gull 1. Such an interesting target, so I persevered with it and despite the awful weather recently I've managed to acquire more data. I used a different off-axis guide star than for Galloway, so had to start again from scratch. Bicolour, Ha and OIII. SII was pretty well negligible so ignored. Eventually I managed 23 H-alpha and 22 OIII 20 minute subs over a number of nights, some crisper than others. QSI 683 on SharpStar 140 refractor with TS2 flattener and Starlight Xpress AO unit. Last batch on 16th-17th January 2023. That set slightly compromised by extra sky glow due to snow covered ground. I also then collected data for the background stars, an image consisting of 5 x 2 minutes each IR, Red, Green and Blue. So I used Steve Cannistra's method mainly to process the two colours, along with a bit more juggling, in particular using StarNet++ to remove the stars. Then added the RGB image for stars. And this is the best I can get. My skies here are simply not dark and clean enough to get the best of this very faint target. But c'est las vie! HFG1 is moving relatively quickly so the bow shock wave is clearly visible as is a tail of Hydrogen gas. The smaller planetary nebula is magnitude 14.3 PK 136+ 4.1 |
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NGC3338 is an attractive 10.9 magnitude spiral galaxy in Leo, usually overlooked in favour of its nearby famous and brighter Messier list neighbours. But worth a look as shown by this excellent Adam Block image. A much awaited clear night on 14th March initially looked promising, but reflections between snow on the ground and moisture in the air which eventually formed freezing fog, allied to poor seeing to spoil contrast and detail, producing a rather disappointing 'noisy' image. But this season has been so poor that anything is better than nothing! QSI 683 on RC10. Luminance 2 x 10 mins + 6 x 15 mins, RGB each 1 x 10 mins + 4 x 15 mins, all binned 2x2. |
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At this time there is a galaxy competition running on Stargazers Lounge. Without repeating some earlier images I didn't have much to offer, although I did enter my Hickson 68 shot from April (above). I don't really expect it to win, but I also wanted to enter a shot of M81 and M82 in the same frame - they would fit nicely in the field of view of my SharpStar 140. The weather did not play fair until 9th May 2023, by this time into Astronomical twilight, but a nice clear night, so this is the result. M82 of course is an active galaxy with huge hydrogen outbursts, well seen in my image from 2012. M81 also has some active regions, so in addtion to the usual RGB colour channels I also captured Hydrogen-alpha. So two versions are presented here, one standard RGB, one with the Ha added. QSI 683 on SharpStar140. Luminance 13 x 5 minutes, RGB each 5 x 5 mins, Ha 9 x 10 minutes, all binned 2x2. The faint fuzzy area just above M81 isn't 'noise', it's the very diffuse dwarf galaxy Holmberg IX (UGC 5336) magnitude quoted between 14.4 and 16.5, rather lost in the twilight glow. I might repeat this combination next Season when I will have time to expose unbinned in a fully dark sky for finer detail, possibly also with Galactic cirrus. |
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Again Astronomical twilight on a clear night of 24th May 2023, BUT a type 2 supernova had been spotted in Messier 101. I hadn't imaged this galaxy since 2006, but of course notwithstanding the lighter sky and low surface brightness the supernova had to be imaged! It was discovered on May 19th by Japanese astronomer Koichi Itagaki. At that time it was magnitude 14.9, but in this image, nearer Mag 11. So here is the result. QSI683 on RC10. Luminance 11 x 5 minutes, RGB each 5 x 5 minutes, all binned 2x2 |
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For many years my image of M11 was this monochrome one from 2003. About time it was replaced! June of course has very bright twilight skies here, and July 2023 was the wettest on record. But a couple of clear nights in August gave me an opportunity. 11th wasn't too bad although clouds moved in, but the night of 15th although not forecast was an absolute cracker - Milky Way beautifully clear across the sky. So although M11 is quite low and was past the meridian by full darkness on both nights, I was able to acquire decent data and here is the result. Luminance 17 x 5 minutes, RGB each 8 x 5 minutes all unbinned. QSI 683 on RC10 with SX AO unit. |
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In early October 2023 a trip to Kelling Heath Star Party was followed immediately by a few days at Calvert Trust Kielder. Unfortunately for both events there was only one reasonably clear night, and although the sky is nicely dark at both locations, it was never clean - always thin high haze. I already had targets in mind and succeeded in getting reasonable images of both, but not as clearly defined or contrasty as would have been possible under better conditions. |
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This is Barnard 169-71 dark nebula in Cepheus. This was the Kelling Heath target. The object is quite faint anyway, and the conditions didn't help, but at least it is visible. The 'squiggle' in the top left corner is seperately catalogued as B173-4. I have a closer image of this from 2013 here. I also have an image of the main target taken under the clear skies of Les Granges in France in 2008, but it does not include B173-4. This image comprises Luminance 15 x 10 minutes unbinned, RGB each 10 x 5 minutes binned 2x2. QSI 683 on TS65 quad with SX AO unit.. Larger image |
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Also in Cepheus, Sharpless 154 is a hydrogen alpha region. Imaged from Kielder, again faint. There was very little OIII and no SII to be seen, so on returning home I gathered RGB data for star colours and added the H-a as a layer. The small open cluster in the lower left corner is NGC 7419. H-alpha 15 x 10 minutes, Luminance 10 x 2 minutes, RGB each 6 x 2 minutes, all binned 2x2. QSI683 on TMB105 with SX AO unit. Remains high for some months, so if possible I would like to gather more H-a data. The slight haze and stretching required has left it a bit 'noisy'. Full size |
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Footnote: The last of the data for Sharpless 154 was gathered on the night of 21st October. And was the last imaging for some time. I ruptured the Achilles tendon in my left leg the following afternoon at a friend's birthday party ceilidh. This severely limited my activity for three weeks due to wearing a non load bearing cast, and indeed I missed a couple of clear nights and a bright aurora shortly afterwards. But once in a load bearing boot I was more active although still unable to drive for several weeks. |
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