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lukebl

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Everything posted by lukebl

  1. Great image. Personally, I'd rotate the image so that the plane wasn't upside down!
  2. Not sure which one the original poster is using. Mine is the QHY5-ii. Still pretty noisy. And you can't use binning with it in PHD, which is a shame.
  3. I would have thought that you should easily find stars with an OAG and the ED80 DS, with the wide field of view. My guess is that the QHY isn't focussed, or the OAG prism isn't positioned correctly. I use a QHY5 mono / OAG with my 1600mm FL RC8 f/8. Although for some targets I can't find a star at all, there are usually one or two sufficiently bright to guide on, even with the narrow FOV. The QHY5 isn't ideal for my setup (I really need something more sensitive) but I'm sure it's fine for the ED80.
  4. This is an interesting edge-on galaxy in Draco, also called the Spindle Galaxy. 50 million light years from Earth with an apparent magnitude of 10.7 50 x 420 second frames Luminance, Atik 428ex, Omegon RC8, captured 10/11 April 2019. Field of view 18.6 x 14 arcmin. Just can't seem to get rid of the dust bunnies. Apparently this galaxy marked the location of the North celestial pole about 6,900 years ago, and will do so again in 20900 AD. The North Pole Galaxy!
  5. It also doesn't have to look like an old shed. You can make it more of a feature to positively enhance the garden. Mine's a roll-away Tardis replica. I reckon there are all sorts of alternatives: mock castle, sentry-box, etc.
  6. Hi, This is my take on the Hamburger Galaxy, NGC 3628 in Leo. Usually seen in a wider field with its neighbours M65 and M66. Perhaps a bit too big for my modest setup of a small sensor and long focal length, which has resulted in a pixel scale of 0.577 arcsec/pixel I am plagued by big dust bunnies which no end of flats won't remove, so I haven't been able to stretch the image as much as I'd like to pull out the fainter distant galaxies. Atik428ex, Omegon f/8 200mm Ritchey-Chrétien. 148 x 300s luminance. 25 x 60s each RGB, binned x2. Field of view 18.6 x 14 arcmin.
  7. Just wondered how to label an image to include the faint DSOs in the background? I use astrometry.net and All Sky Plate Solver for my plate solving which are great, but they only identify the biggest and brightest objects in the field of view. For instance, the image below has gazillions of galaxies in the view, but astrometry.net just identifies a few of them. I understand that PixInsight will do it, but I don't want to go to that expense.
  8. Hi all, I stumbled across this fascinating face-on galaxy in Ursa Major, NGC 3642, which doesn't appear very often in observing reports. It has a notional magnitude of 10.8, but most of it is very diffuse and faint. Probably not the best subject for an f/8 scope. This is the result of over 21 hours of 8 minute exposures luminance. RGB: each 15 x 2 minutes 2x binned. According to Wiki it is characterised by an outer pseudoring, which was probably formed after the accretion of a gas-rich dwarf galaxy. I've seen it referred to as the 'brokeback' galaxy for some reason. Presumably because of it's 'damaged' nature, rather than the film? There is a whole cloud of distant galaxies in the field which you can see in the original highly-stretched image. Omegon 200mm f/8 RC, Atik 428ex. Field of view 19.1 x 13.5 arcmin.
  9. I think you'll find that they are asteroids (4242) Brecher (top one) and (2217) Etigen (bottom). Both around 17th magnitude. I checked on Carte du Ciel.
  10. Hi all. I successfully recorded only my second asteroid occultation very early this morning. I was just a mile from the centre line of the occultation of a relatively bright star (mag 9.8) and recorded a 3.7 second occultation by (623) Chimaera, using a RunCam Night Eagle Astro camera, 200mm f/8 RC, 0.5x reducer. Capturing at 25fps. Here is the light curve, processed with Tangra software: And here are before and during screen grabs from the video. During occultation:
  11. Last night, I thought I'd try and capture a series of images of the terminator over a period of an hour or two and see if I could make an animated gif of the result. Unfortunately, with the moon rotating at only a 28th of the speed of the earth, the results are a little underwhelming for a lot of work! I captured 2000 frames of 1/50 sec exposures at 20fps every 15 minutes for a period of 3.5 hours, with a QHY5-ii mono cam, 3x Barlow, 8" RC. This is one full frame stacked image , with the box highlighting the area of the 15-frame animation. Lots of variation in the seeing, so the gif is a bit jerky, but at least it shows the changes in the shadows of the mountains over the period.
  12. Thanks for the advice. I'll try longer exposures and/or darks. Is it best to use darks during capture (in Sharpcap), or during stacking (in Registax)?
  13. Hi folks. I had a go at imaging the moon on Monday 11th Feb with my new 8" Ritchey-Chretien, and I'm pleased with the sharpness of this scope. Being very rusty with lunar imaging, one thing which which bothers me is the grid pattern which appears on the resultant stacked images, as shown in closeup in the lower image. I'm thinking it's something to do with gain/gamma. Can anyone suggest what settings need to be changed to improve it? The only way I can remove it in Photoshop is to blur the image till it disappears, then re-sharpen the image which isn't really satisfactory. QHY5-ii mono, Omegon RC8, Televue 3x Barlow (4800mm focal length), 2000 frames stacked in Registax 5. This was meant to be a total moon mosaic but, as always, there were a few gaps rendering the attempt futile! This image is made up of 6 frames.
  14. Too windy tonght to roll it out, but here's a quick shot of my Tardis Obsy under Orion. Canon 700d, ISO 1600, 8mm Samyang, 30s f/5.6.
  15. I'm flattered that my Tardis gets a mention! It works very well, and is a way of having a functional observatory AND an interesting garden feature. Takes just a couple of minutes to roll it away and get started.
  16. Thanks for the nice comments, folks. Yes, it is a very neat and tidy galaxy with not much apparently going on!
  17. I captured this stunning galaxy in Ursa Major with my new 200mm f/8 Ritchey-Chretien. Apart from the way oversaturated stars appear, I'm very pleased with the performance of this scope. It's nice to be able to use a relatively long focal length (1600mm) to capture these smaller objects, without requiring reducers or correctors. Its apparent size is 8.1' x 3.5', and according to Wiki it is an inclined unbarred spiral galaxy exhibiting a prominent inner ring structure, discovered on 9 March 1788 by William Herschel. Initially thought to be about 30 million light years distant, a 2001 Hubble Space Telescope survey of the galaxy's Cepheid variables determined that it was approximately 14.1 megaparsecs or 46 million light years distant. Atik428ex. 6h 30m of 300s exposures Luminance. 15 x 60s RGB each channel, 2x binned. Field of view 13.1 x 18.2 arcmin. Off-axis quiding with a QHY-5ii mono.
  18. He's a quick close-up capture of the centre of M38, captured with my Atik428ex and 200mm f/8 Omegon RC. Not sure I like the way the RC handles bright stars, but if it's OK for the Hubble.... 12 x 120 second exposures RGB, 20 x 180 second exposures luminance. Field of View 18.6 x 14 arcmin. The so-called 'Starfish Cluster'. Can't see it myself. More 'Old Grey Whistle Test' (something for the older members!).
  19. If only. The Time Lords have banished me to this little third rock and deactivated my only means of escape.
  20. Here's mine. I might have cheated a little, as this was a photo from last February during the visit by the 'Beast from the East'. This time round, we folks in East Anglia haven't had much snow yet!
  21. Slightly off-topic, but it's interesting that the North Magnetic Pole has been shifting at an accelerated rate over the past few years. Only a few decades ago it was in Northern Canada. Now it's actually quite close the the Geographical Pole, and from the UK, magnetic north is now extremely close to true north. EDIT: Sorry, I was wrong. I've just read that there are actually three, not two north poles! There's the True Geographical North Pole, the North Magnetic Pole and the Geomagnetic North Pole. And they're all different! The North Magnetic Pole is the one which has been moving around, but the Geomagnetic North Pole is the one to which a compass will point and that one is still over North Canada! Very confused now.
  22. I remember hearing that story when I was a kid. But now that I'm much older and wiser, it occurs to me that the field of view from the bottom of a well would be ridiculously small, and the chances of there being a bright star precisely at the zenith at that moment (as it would have to be to be visible from a vertical shaft) would be very remote. Just an urban myth. Like the one about Bob Holness doing the Sax solo on 'Baker Street', or that swans will break your arm with flap of their wings!
  23. Fantastic luck and image. It's amazing how bright the flash must have been, especially considering the object was apparently only as big as a football and that there was no atmosphere for it to burn up in.
  24. A lot of awesome images have been posted of the eclipse. Here's my contribution. It was mostly cloudy here, and the period of totality was completely clouded out, but I managed a couple of brief captures about 30 minutes before totality. I like the contrast here between light and dark, and the haziness of the high cloud.. Canon 6d, ISO800, 1 second exposure, Omegon 200mm f/8 Ritchey–Chrétien.
  25. Or, more subtly, 'Which planet is, generally, closest to Earth?'
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