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Found 19 results

  1. Shibby

    Pacman Nebula in Ha

    From the album: Deep Sky

    32x600s ISO800, modded Canon 450d + Baader 7nm Scope: SW 150PDS Mount: Vixen GP
  2. Hi guys First things first, apologies for posting this one out of season. A combination of no astro dark, crappy weather, and being busy at work has meant that there's no imaging getting done at all these days. So, i've had to turn to old data to re-process, and this data set was an obvious candidate as i was never happy with how it came out originally. And looking back on it now with fresh eyes, boy did it need it! Nikon D5300, SW 80ED, HEQ5-Pro. 3 x 1200s, 2 x 1380s, and 4 x 1500s of Ha 9 x 1200s of Oiii. 11 x 480s with an IDAS-D1, for RGB stars only 7 Hrs 54 Mins in Total. Stacked in APP and processed in PS. Combined as SHO (using a 70/30 blend of Ha/Oiii for the Sii). The main differences this time were, using Starnet++ to create the starless versions, using more Ha in the synthesized Sii (70% instead of 50% last time), but mostly the improvement has come from toning down the stretch a lot (ok, a heck of a lot!) before making the colour map for the tone-mapping. From then on it was immediately apparent that i'd made a massive boo-boo first time round I've included a 1080p rotated crop too, as i quite liked the framing. Feels like ages since i last did any NB imaging. I almost forgot how much i enjoy it! And rather embarrassingly, here's the original. Try not to laugh too hard!
  3. My first attempt at NGC281 was with my ED 80 and taken with my colour camera - and I definitely thought the result looked liked the Pacman. So, whilst attempting to image this object with my Esprit 150, I thought I'd end up with another Pacman, albeit somewhat more detailed. However, the more I looked at my narrowband result, the less I decided it looked like the video game character. I think this is because my eye was drawn to the various nebula details, which tend to be absent in a broadband approach but reveal themselves with a narrow-band technique. So, for this bi-colour image, I decided to try to enhance the details by experimenting with colour contrast curves and the Pixinsight script DarkStructureEnhance. The image represents 9 hours total integration time. (If you are still interested in seeing the Pacman, then you need to rotate the image by 180 degrees). Alan LIGHTS: Ha:8, OIII:10 x 1800s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
  4. The Pacman Nebula in Cassiopeia (NGC 281). Captured with APT, Canon DSLR, Baader coma corrector, Hα filter, .25m f/4 reflector, at ISO800, 19x600sec exposures. Guided with PHD2, finderscope, Atik16ic. Registered and stacked in Iris, processed in PixInsight, no calibration frames. The last 5 exposures were taken in a sky with no naked-eye stars visible (due to thickening high cloud) and the first 6 were badly focused! So definitely a session to learn from...
  5. Thought I would share my first attempt at the Pacman Nebula (NGC281) using some Badder Narrow band filters in my Atik One 6.0 / Esprit 120ED. Over two nights, I first took 12 x 10 minutes guided shots at 1x1 binned with both the Ha and OIII filter (i.e., 4 hours total exposure) and put them together using PI with Ha mapped to red and OIII to both Green and Blue. This gave this image:- On the following night I then took 12 x 10 minutes guided shots at 1x1 binned with the SII filter. I then put all the shots together using PI, this time with SII to red, Ha to green and OIII to blue (6 hours total exposure). This gave this image:- I think for the bicolour one, I have over stretched it a bit, which I do not like, and although I prefer the tricolour, I can not help but think that it should be red rather than green, which is of course what is going to happen if Ha is mapped to green rather than red?? All comments, particuarly critical ones on how I could improve things (I have a very think skin) welcomed. DDS
  6. NGC281 - The Pac-Man by Chris Kennedy, on Flickr 35kph gusts of wind, and REALLY bad guiding due to a lack of drift align and the star being "blown away", but managed to get a little something out of 30x360s light frames, also a new target for me, one I want to come back to under better conditions and with other wavelengths of light to make a full colour image.
  7. Hi, This is data from two nights and you can see the joins (I´ll center the scope properly next time). 16 x 900s HA ED80 5s subs guiding (maxim DL) Mesu 200 Art285 camera. It's been a typical weekend here where after a few days of rain the warmish sunshine during the day means the fog rolls in as soon as the sun goes down. Last night though it held off until 2am so managed to get 2 1/2 hours of NGC281.
  8. I've always found the Pacman nebula (NGC281) very difficult to process in RGB since I always tend to end up with a low contrast image that is largely devoid of detail. So, since I prefer realistic looking colours, I decided to try out a narrow band approach with Red mapped to Ha and Blue mapped to OIII. After balancing the Ha and OIII data in Pixinsight via Linear Fit, I generated a synthetic green in PS via Carboni's actions. The result below represents 15 hours integration time and was taken with my Esprit 150. To illustrate the amount of detail revealed, I've also included a small crop of the central region. Alan NGC281 NGC281 (crop) LIGHTS: 9 Ha, 21 OIII x 1800s, DARKS:30, BIAS:1000, FLATS:40 all at -20C.
  9. Hi all, It's been a while since my last image, but finally clear skies have coincided with availability and I managed to capture some data. For some reason I didn't seem to have an awful lot of signal; I had to work quite hard processing this and struggled to bring out the detail with any dynamic range. Even so, if I get another chance I think I'll try and get some O-III for this. 21 x 600s Ha SW 150PDS Atik 428ex Thanks for looking!
  10. While I am waiting for enough astrodark to make it worth while up here, I have revisited my Pacman nebula data from November last year, since I had the feeling that there were more nebulosity there to bring out. Most Pacmans I have seen posted on the web are processed quite hard and only bring out the central parts - maybe to emphasize the Pacman figure. However, I just saw a Ha image of Pacman at Astrobin that reveals a lot of surrounding Ha-nebulosity, particularly to the right of the nebula (http://www.astrobin.com/full/144610/0/). So here is my revised version showing more of that surrounding nebulosity. Below it I post my old version for comparison. Processed in PS CS5 now also using the APF-R technique (http://www.cedic.at/apfr/) to bring out more faint stuff and a round of Hi-pass filtering to bring out more structure in the nebulosity. Equipment: ES 127EDapo with a Canon 60Da on an EQ8 29 x 360 sec, so totally about 3 hours. Any comments and suggestions most welcome - I am sure it can be improved
  11. No clear nights in sight to keep me awake so great re-processing weather over here in Sweden! This is data from end of November. About 3 h (29 x 6 min) of the Pacman taken with my 5" ES apo and Canon 60Da at ISO 1600, so pure RGB. Comments and critique most welcome of course Cheers
  12. alan4908


    From the album: Deep Sky III

    This is a narrow band image with Red mapped to Ha and Blue mapped to OIII. After balancing the Ha and OIII data in Pixinsight via Linear Fit, I generated a synthetic green in PS via Carboni's actions. It represents 15 hours integration time and was taken with my Esprit 150.
  13. AlastairW

    NGC281 Ha

    From the album: Messier and NGC Objects

    First light with my QHY IMG2PRO. 4 x 10 min, no calibration Kit used Skywatcher 130pdS, HEQ5 Pro Goto QHY IMG2PRO, 6nm Ha filter 8x50 + QHY5LII + PHD2 for guiding Processed in DSS and PS CS2
  14. alan4908


    From the album: Deep Sky

    Mainly due to the UK weather and the fact that I value my sleep, I find that I'm moving increasingly towards automated image capture. The Pacman nebula (NGC281) was my first automated image and represents various observations in Oct/Nov 2015 during mainly cloudy/moon lit nights. The automation software (ACP Expert) was instructed to wait for a clear sky, with a moon down and a target that was above my local horizon. Automated focusing was via FocusMax. Captured with a SW ED80 and a Trius SX26C. LIGHTS: 30 x 600s; DARKS: 40, FLATS: 40; BIAS: 50. Post processing in Photoshop CC 2015 and CCDstack2+.
  15. From the album: Deep Sky

    Ha: 32x600s ISO800, modded Canon 450d + Baader 7nm Colour: 53x120s ISO800 + darks, unmodded Nikon D70 Scope: SW 150PDS Mount: Vixen GP
  16. Wakka wakka wakka... 22x 600s Ha, 11x 420s L, 10x 300s R, G and B, darks flats and bias, equipment as per sig, pixinsight. If I'm honest, I wasn't really feeling the love for this one very much and it's been languishing on my processing shelf for a while - a little too much of it being an amorphous pink blob, coupled with oddly triangular stars (I had issues with coma and collimation when I took it, now resolved, but it meant I was getting tri-lobed guide stars in my OAG and I think that fed through from the guiding to giving me triangular stars in the images. You can't really see them since Flickr doesn't zoom in enough). Still, it turned out alright, and I quite like the detail version. The Pacman Nebula (NGC 281) is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way's Perseus Spiral Arm. The nebulosity is associated with an open star cluster, several Bok globules and a bright quintuple star system. It lies approximately 9200 light years away. Pac-Man was designed to have no ending – as long as at least one life was left, the game should be able to go on indefinitely. However, a bug keeps this from happening - an 8-bit arithmetic overflow error on level 256 would mean that the game would try to draw 256 fruits on the screen rather than the maximum of 8 that it would normally draw. This corrupts the bottom of the screen and the entire right half of the maze with seemingly random symbols and tiles, overwriting the values of edible dots which makes it impossible to eat enough dots to beat the level. Because this effectively ends the game, this "split-screen" level is often referred to as the "kill screen". A perfect Pac-Man game occurs when the player achieves the maximum possible score on the first 255 levels (by eating every possible dot, power pellet, fruit, and enemy) without losing a single life, and using all extra lives to score as many points as possible on Level 256. This was actually my second attempt at this target - this was my first one, with a modded DSLR - actually not too bad: Hope you enjoy ! Comments and cc welcome. Stuart
  17. After much experimenting and learning over the last 12 month i have managed to bring it all together from set up and drift align, getting PHD 2 to keep the mount on track and stay on the graph to the processing. Only issue was as allways heavy LP in the mids, graradientXterminator used to remove. 32 x 2min subs with 16 darks and 20 each bias and flats. Imager: Full spectrum modded EOS 1100D with Badder Neodynum and coma corrector on SW150P Guider: ZWO ASI120MM on ST-80 Mounted on a Bresser EXOS 2 Stacked in DSS Processed in PS5 Evrything just worked for me from start to finish for the first time. i think the drift alignment was the key as it would appear my polarscope isnt very reliable. Well Pleased
  18. Well its been a long time coming but I have managed to get back into the obsy and start imaging again. :-) I was very rusty setting up and my tracking started off good and then started to fail as the target was straight overhead. Anyway without much ado - Here is the result - Just 3 x 10 min subs (The rest got scrapped to the poor tracking) with a bit of pixel bodging in PI Cheers John MN190, QSI683 with Astrodon 3nm Ha
  19. So here's the last of my summer's crop of data. I need to get out there again now and take some new stuff ! 28x 300s lights at ISO1600, darks flats and bias, equipment as per sig, modded DSLR at prime focus, Pixinsight. My wife surprised me by saying that it looks like a pacman, without her knowing the name of the nebula. Personally I think it looks more like an angler fish. The Pacman Nebula (NGC 281) is an H II region in the constellation of Cassiopeia and part of the Perseus Spiral Arm. It includes the open cluster IC 1590, the multiple star HD 5005, and several Bok globules. The multiple star consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 seconds of arc. Hope you enjoy, comments and cc welcome. Stuart
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