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lukebl last won the day on November 8 2018

lukebl had the most liked content!

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About lukebl

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  • Gender
  • Interests
    Norfolk Astronomer, bread-maker, bug and wine enthusiast. Come to Attleborough. At least it's not Watton.
  • Location
    Central Norfolk-ish somewhere, UK, 52°N 1°E ish
  1. 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.
  2. lukebl

    Lunar imaging with QHY5 ii mono

    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)?
  3. 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.
  4. lukebl

    Show us your set up in action at night.

    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.
  5. lukebl

    Permanent but Temporary Obs?

    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.
  6. lukebl

    Spiral Galaxy NGC 2841

    Thanks for the nice comments, folks. Yes, it is a very neat and tidy galaxy with not much apparently going on!
  7. 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.
  8. lukebl

    M38 Open Cluster

    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!).
  9. lukebl

    Show us your Observatory in the Snow

    If only. The Time Lords have banished me to this little third rock and deactivated my only means of escape.
  10. lukebl

    Show us your Observatory in the Snow

    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!
  11. lukebl

    Aligning true north.

    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.
  12. lukebl

    Day time stars

    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!
  13. lukebl

    Lunar impact during the eclipse.

    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.
  14. 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.
  15. lukebl

    Which is the closest planet to Earth?

    Or, more subtly, 'Which planet is, generally, closest to Earth?'

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