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Found 61 results

  1. My beloved wife bought me an Astrotrac for Christmas. Now that the relatives have all gone home I had my first play with it. The weather here has been foul for the last week, and tonight was due to be almost uniformly cloudy. However I did manage to get half an hour outside where I could see the stars. I did a few trial runs indoors to see how the Astrotrac fitted onto the tripod and how the ball joint fitted onto the Astrotrac and how to power the whole thing up. It all went together smoothly. I had a bit of trouble getting the 20 year old tripod to stay where I put it, and I had to learn how far out I needed to aim, so that when I tightened it all up it ended up where it needed to be. then I set it going and took a test shot. First shot, star trails. So I checked the Polaris alignment and it was a bit out, so I tried to realign and took another shot. Long star trails... I tried this about 3 times, each time the alignment looked a little out, but not hugely. Ok, so the alignment needs to be really dead on then... Hang on... You unfold the arm one way for south of the equator and the other for north of the equator. I wonder.... Yup, I had unfolded the tracking arm the wrong way. As you can guess the air turned a bit blue. Ok, reverse the arm back to the starting position, and fold it back up and down the other way. Then take another test shot... Wow!. Okay, that works. I did not bother to take the laptop out because there was no way I was going to be out for more than half an hour. So I had not way of taking a shot of more than 30 seconds, and I had no way of focussing other than taking a shot and fiddling with the focus by hand, then taking another shot. Even so I managed to get something half decent. So this is a stack of 6 30 second subs at 300mm iso 800 and 6 darks. I cropped the image to about half size to concentrate on the nebula. Stacking was done in Deep Sky Stacker with some fiddling with in Photoshop afterwards. By no means an Olly standard photo, there are still some minor star trails due to bad alignment, and the focussing is off, but not back for half an hour with a new toy and no laptop to help with the focusing.
  2. Took this the other night/morning,first time I've imaged this and really pleased with it.Taken with a 200P on an EQ5/AstroEQ,modified Canon350D with a 1.25" Castell UHC filter(for the light pollution)21 x 120 sec subs at ISO1600,processed through CS5 by Mark,cheers once again. Didn't realise how bright the core was so had to 'borrow' a few subs off QM to get some detail in the core
  3. orion25

    ORION NEBULA 12 25 14

    From the album: Starchasing

    Stellar evolution in the making!


  4. Hello All, I was wondering whether it's possible to image a DSO and capture any depth. Every 3D astro image online is faked so at the start of the year, I decided to image M42 six months apart. Back in March I posted a image of M42 imaged at f10, 2032mm FL through my 8SE on 28th February 2019. Than on 3rd September (setup and captured 15 second subs on 1 September) I captured M42 at the same focal length, same orientation and very similar subs for a total exposure of 1 hr 24 minutes. This was almost to the day exactly 6 months between the two images, so the earth was 300 million km away from the original position on the other side of the sun, furthest I could hope for imaging a 3D stereo pair. First attached is the image from September... I color matched the above image with the image from February, aligned them and below is the end result.... As you can see there is no detectable 3D effect... There was a 3Dish effect but this was most likely due to the differences in processing of the two stacks and when I SCALE and rotate the two images to align them, and hence no 3D effect. Of course the stars and nebula are certainly not on a flat plain so I believe that the reason for the lack of any discernable depth is simply due to the distance of M42 resulting in a very small angular shift in the stars, so small in fact, that it’s beyond the sensitivity of my 8” SCT, camera pixel resolution and tracking accuracy of the CGEM. Calculation of the expected motion of any parallax shift when the Orion Nebula is 1344 lightyears away and the distance of Earth being 149,600,000km from the Sun: 1344LY = 1.2715e+16km Θ° = Tan-1(149.6e+6/1.2715e+16) Parallax Shift Θ” = 2 x 3600 x Θ Parallax Shift Θ” = 0.0048536712567150 An angular motion of 0.005” was not picked up by my system that tracks with an average accuracy of about 1” RMS, with a camera sensor that has a resolution of 1.16”/pixel at 2032mm focal length with a 8” SCT. Even if I could get consistent tracking at the best accuracy that I have ever seen with my gear, 0.38” RMS, this is still well above 0.005” and well beyond the 40D sensor pixel resolution, and all this is without considering atmospheric distortion, obviously my setup is not even close to sensitive enough. This was a good project but unfortunately the distances of objects in the universe are too great, even objects classed as in our celestial “backyard”. If I didn’t try this experiment than I would be always wondering and curiosity would most likely make me try it eventually. Clear Skies, MG
  5. Hello astronomers, This exposure of the Orion Nebula region is really just a quick and lazy session since I didn't want to waste a clear night by doing nothing and the scope was already setup and focused so I wouldn't be spending much time on setup. I also didn't have a plan for imaging another object it seemed like a good idea being a bright and easy object to image. I already imaged this object in the past, but by comparing the setup, procedure and improved tracking accuracy of the past together with the now cooled 40D, I know that the result would have been an improvement if I would have dedicated the necessary exposure time, through the necessary NB filters. This image consists of all RGB or OSC (through the IRCut filter) 31x15s, 32x30s, 16x60s, 10x90s, 11x120s ISO1600 subs. I am not prepared to spend subsequent nights capturing narrowband subs on "Orion's Sword", at least not this year... perhaps next time M42 is in the sky and only if I reach near freezing temperature cooling on my sensor. Clear skies, MG
  6. Taken Saturday night, 25/26 Nov 17. 80 subs of 0.1.s, 1s, 10s x 20 each. 60s and 180s x 10 each. Flats/bias/darks x 10 each. Atik 4120EX OSC camera Celestron C11 with Hyperstar Mesu 200 mount.
  7. Hi, i captured orion nebula with nikon d5600 and nikon 18-140mm lens,the images it took was shaky and look like small star trails but i kept only at minimum shutter speed...what is wrong with the image? i hv attached sample image..pls help
  8. Hi Everyone, This is my best M42 image till date. Every year I take a shot at this wonderful object and every year it teaches me something new. I started using Pixinsight only two days ago and the results are dramatic. I do take more care while processing and it has given me wonderful results. C&C welcome.
  9. I keep "upgrading" my older pics and it actually turns out better then i thought it would... I first captured Orion RGB on the 7.3.2014 with the moon really close by (18x150sec@ISO200). Later that year i added the running man with RGB data from 26.12.2014 (11x120sec@ISO800), and the pic instantly looked "more complete". Then here a couple of weeks ago i was able to gather 20 min of Ha data (10x120sec@ISO3200]. Not nearly enough with my unmodded 550D, but helped a bit still. It's my first attempt in HaRGB, so i'm quite pleased with. Edit: First is HaRGB, 2nd is the old RGB.
  10. The Orion Nebula - taken over three nights in September 2014 in Ortigia, Sicily. 103x15 second exposures at ISO 1600 and 131 dark frames (total exposure time 25 minutes and 45 seconds). Processed in Deep Sky Stacker and Photoshop CS6
  11. Not my best efforts but it was nice to be able to image anything! Taken with my ED120 and Canon 1200d. Various issues last night including the computer crashing at one point, fireworks, satellites..... Peter
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