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Everything posted by Knight of Clear Skies
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IC1805 The Heart Nebula SHO with creative crops
Knight of Clear Skies replied to Astro_Gaz's topic in Imaging - Deep Sky
Very nice, think the starless image works particularly well here. -
Thanks all. There are a few other targets I think should make good optical/IR composites so I'll be have a go at a couple more sometime.
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At last.... I can see the Pelican.....
Knight of Clear Skies replied to Craney's topic in Imaging - Deep Sky
It's a bit like the Man in the Moon, once you see it you can't un-see it. (By the way, the NA & Pelican are actually one HII region obscured by an intervening dust cloud. The ionizing source is a very hot star hiding behind the dust, barely visible at optical wavelengths.) -
I had a go at making a composite of with of my images with some IR data from one of NASA's space telescopes. The idea was to show that a great deal of the activity in a star-forming region is hidden at visible wavelengths. Emission nebulae are often visible parts of much larger structures. The image on the left is mine, a mix of Ha and RGB data taken with the Samyang 135mm f2. The image on the right uses data from NASA's WISE (Wide-field Infrared Survey Explorer) space telescope, with a blend of the two in the middle. Field of view is about 9x9 degrees so it covers a large swathe of sky in central Cygnus. The IR image shows good coherence with the visible image in the star-forming regions around the Cygnus wall and head of the Pelican. As I understand it, Ha emission comes from a relatively thin shell, as only a small depth of materiel provides shade from the ionizing source. I'll have a go at making a crossfade video to show this more clearly. At lower right is the Cygnus X complex, the largest known star-forming region in the Milky Way. It shows little coherence with the visible-light image as it's behind them, largely hidden behind dust clouds. It contains the Cygnus OB2 & OB9 associations, the former is visible as a dim star cluster but without the intervening dust some of its stars would be nearly as bright as Deneb. This map shows the extent of Cygnus X if you keep scrolling up past the NA & Pelican (Sh2-117), and past the much more distant Butterfly (Sh2-108): http://gruze.org/galaxymap/map_2020/ Also of interest is the bright star at bottom-middle in the IR image, but almost invisible in RGB. This is NML Cygni, a red supergiant and one of the largest known stars. Hope you find this of interest. This image makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration.
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This is well worth a look, an ultra-deep image of these interacting galaxies: https://theastroenthusiast.com/the-interacting-triplet-of-m81-m82-and-ngc-3077-an-ultra-deep-219-hour-collaboration-detailing-the-nuanced-interaction-remnants-and-galactic-cirrus/ But what makes it interesting is that the page has a version with HI radio data added, which shows the gas bridges between the galaxies in blue. This could be useful for distinguishing IFN from faint tidal bridges.
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Often for the better, there are good reasons why we don't send children up chimneys these days. I hope the next generation will genuinely find fault with ours, there are plenty of problems we aren't addressing adequately.
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3C 273 - The Search for the Jet, the Sequel
Knight of Clear Skies replied to tomato's topic in Imaging - Deep Sky
Nice job, I think you have captured the jet there. -
Thanks for the heads up.
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Had a go at capturing a timelapse of the NA & Pelican rising over some trees. Used an Ha filter to isolate them from the background, the close-up shots are 30 second exposures with the Samyang 135mm. In the foreground of the wide shot we were testing out a SkySense which could be very handy for public outreach events. It worked very well, hitting the target quickly each time.
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Bright fireball 28 04 2022
Knight of Clear Skies replied to ollypenrice's topic in Observing - Reports
Sounds like a good one. Can't find any video of it but looks like it's been reported here, so there may be more to come: https://fireball.amsmeteors.org/members/imo_view/report/268648 -
SGL 2022 Challenge 1 - Animations
Knight of Clear Skies replied to MartinB's topic in SGL Challenges and Competitions
Here's a timelapse of Orion's Belt & Sword rising over Kit Hill, Cornwall. -
Was framing up the Rosette nebula earlier and saw a meteor burst very close to it on the liveview. Think I saw the a vapour trail drift away from it over the next couple seconds. If anyone was out imaging the Rosette it might be worth checking your subs.
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The Spaghetti Nebula (Simeis 147, Sh2-240)
Knight of Clear Skies replied to geeklee's topic in Imaging - Deep Sky
Fine result on a difficult target. -
After over 20 years of use, the internal battery in the Vixen SkySensor I use has failed. It still works but it's a right pain to enter all the settings each time it's powered up. I found this useful guide to replacing the battery: https://www.atm-workshop.com/skysensor-battery.html I think I've found the correct battery here, I'd appreciate it if someone could take a quick look and sanity check it for me please? https://www.amazon.co.uk/LS14500-2PF-Lithium-Battery-soldering-Metal-metal/dp/B00432X9AO/ref=sr_1_8?adgrpid=55994738867&gclid=Cj0KCQiAraSPBhDuARIsAM3Js4pciin6eFp5Ycq2ghwlWsn8rAl1L0MiWPQ29z3ivjmZELL9LJs1l6QaAuOQEALw_wcB&hvadid=259012927905&hvdev=c&hvlocphy=1006879&hvnetw=g&hvqmt=e&hvrand=8399788309656975884&hvtargid=kwd-296729583584&hydadcr=22927_1724234&keywords=ls14500&qid=1642711960&sr=8-8
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A welcome clear sky but a bright Moon dictated a bright target, so here's the Heart nebula. About 80 minutes of Ha with the 200mm L f2.8 lens and 1600MM cool (1 minutes subs). The colour starfield is just a 20 second exposure with the Samyang 135mm f2 and 6D. Hope you like it, was good to get out imaging again.
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To much for a DSLR? Spaghetti Nebula.
Knight of Clear Skies replied to Clarkey's topic in Imaging - Deep Sky
It's a tough target for a DSLR. I did manage to capture it with the Samyang 135mm f2 lens, Ha filter and modded 1100D but I got a much better result with my 1600MM cool. -
Imaging with the Samyang 135mm f2
Knight of Clear Skies replied to Uranium235's topic in Getting Started With Imaging
What's the capture details for that one please Uranium? -
Frustrating Weather Forecast!
Knight of Clear Skies replied to Mr Spock's topic in Observing - Discussion
I've had some fun sessions recently but have drawn a complete blank on any deep imaging since the Spring, one way and another. AP is definitely an intermittent hobby in this country.