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Showing content with the highest reputation on 09/11/19 in all areas

  1. 6 points
    Lovely placed , from here quite invisible to the eye , but some treasures. Early frosty evening , sno boots and down trousers on ( that sounds wrong !) NGC 2419 is a favourite and I never tire of getting folks to spot it and tell them how far it is away . That's the furthest target that we can see in our galaxy.Look for the fish hook with the double star in the middle , continue the shank and that slight sparkle is there. Tried for the "UFO" galaxy , a bright edge on (+9.7) NGC 2683, but hardly a smudge with the moon in the south. Very high up on the ecliptic sat the lovely disc of Uranus , so non stellar. Vesta was a bright target in Taurus. Kicked off with the best of Lynx binaries. 5 Lyncis giving an orange giant with an unrelated companion. 19 Lyncis is an attractive triple, but I was after that wonderful 12 Lyncis, quite stunning. Beautifully calm sky , seeing and transparency was terrific , a high cold mist drew in. Had to towel down the ota and mount , dew attack. Hoping for some less Soggy , clear skies ! Nick.
  2. 5 points
    This was my 1st light with my camera, the stars are a bit of an odd shape, that was because this afternoon I realised my Optolong Dual Enhance filter the night I was imaging got cracked, as I accidentally dropped it. See thread However I was very much impressed with the results only for 1 hours worth of data, no calibration files were used.
  3. 3 points
    A lovely clear 10 day old moon hung in the sky last night. I hadn't intended to go out but it seemed rude not to. I had a lovely lunar session scanning the terminator. Clavius looked fantastic and so thought I would try and sketch something of what I saw as the frost settled around me.
  4. 3 points
    They look exactly the same as the TS ones I have which are excellent value and perform very well. Just a note, binoviewers dont 'turn a 6" scope into a 3" one'. Yes, the light is halved to each eye but the resolution is preserved and your brain does some very clever stuff combining the image. I really enjoy mine for high power lunar and solar viewing where they help combat floaters and provide very relaxed observing and fantastic detail when seeing allows.
  5. 3 points
    If you haven't already tried using a binoviewer I'd suggest doing so at an astronomy club before buying one. Not everyone gets along with them! Personally I love them and would suggest you buy a cheap model, which are generally optically and mechanically very good. A 2X Delux Skywatcher barlow is excellent and will allow you to screw just the barlow lens element directly into your binoviewer, or use the full length barlow for a little more amplification. Don't waste money on expensive high end eyepieces for bino viewing. A good plossl or orthoscopic pair will deliver stunning lunar and planetary views that will equal the very best single planetary eyepieces in performance. Binoviewers are ok on brighter deep sky objects but generally they are best for moon and planets, where as deep sky is often better observed using a single quality wide field eyepiece.
  6. 2 points
    The International Astronomy Show is a major event on the UK astronomy calendar and this year's is looking especially good. The venue is easy to find with free all-day car parking (next to the show arena restaurant that serves hot food and drinks all day). Here is what you can look forward to: Lectures by some of the UK's best speakers. Friday: Paul Fellows (10.00am - 11.00am) Peter Jenkins (11.15am - 12.15pm) Peter J Williamson FRAS (1.00pm - 2.00pm) Dr Andreea Font (2.15pm - 3.15pm) Dr Stuart Clark (3.30pm - 4.30pm) Saturday: Paul Money (10.00am - 11.00am) Damian Peach (11.15am - 12.15pm) Dr Dimitri Veras (1.00pm - 2.00pm) Prof Hilary Downes (2.15pm - 3.15pm) Prof Andrew Blain (3.30pm - 4.30pm) Vendors / Exhibitors Lots to see! 10Micron (Ikarus Imaging) 365 Astronomy Altair Astro Astro Radio/Solarsphere Atik-Qsi Cameras AWR Technology Astrograph British Astronomical Association Dark Skies Jewellery Gary Palmer Solar Outreach HitecAstro Ltd iOptron (Ikarus Imaging) IAS Merchandise IC Astronomy remote telescope hosting (Ikarus Imaging) Ikarus Imaging (new home for Ian King Imaging) Image The Universe Jackie Burns (artist) Light by Night photography Lynx Astro (Ikarus Imaging) Msg-Meteorites Opticron Optolong (Ikarus Imaging) Orion Optics UK Pegasus (Altair Astro) PrimaLuce (365 Astronomy) Pulsar Observatories Rother Valley Optics Rowan Astronomy Starlight Xpress (Ikarus Imaging) Sharp Cap UK Sky Vision fr Dr Stuart Clark Spacerocks UK Takahashi (Ikarus Imaging) W&W Astro Webb Deep Sky Society Widescreen Centre ZWO (Ikarus Imaging) (I have taken the liberty of adding in bold those items available to view on the Ikarus Imaging stall ). Myself and some colleagues, including Ian King, will be on the Ikarus Imaging stall. We will be introducing some new products and have items on display from existing brands including 10Micron, iOptron, Lynx Astro, Optolong, Starlight Xpress, Takahashi, ZWO & others. (The stall is easy to find, opposite Rowan Astronomy and next to Pulsar Observatories). We are especially looking forward to revealing the first of a new series of premium telescopes, a new (to the UK) manufacturer of premium astronomy mounts, a new manufacturer of astronomy accessories and, of course, the new Rowan Astronomy AZ100 Alt-Az mount. Last but definitely not least, we will reveal a project that will be of special interest and benefit to SGL members... Tickets can be purchased from the IAS website or on the day. We hope to see you there Steve
  7. 2 points
    I've had my EQ6-R plus 200PDS and electronics, cameras etc mounted outside under a Telegizmos cover for well over a year and they're all absolutely fine and rust-free. I'm not near the coast or anything though. Just pop the cover off, lens caps off, dew shield on, run out the mains cable and 12V supply and plug that in - everything else is already set up and good to go, though being on a tripod it does need polar alignment once in a while. Only gotcha is that while I can get insurance for everything, weather isn't covered unless it's in an observatory! The pier looks fab and solid. The tube approach I've seen done by a few people now and it looks a great way to contain the concrete.
  8. 2 points
    The Pretty Deep Maps are now in what I hope will be their permanent home, hosted on the open science platform Zenodo: http://doi.org/10.5281/zenodo.3522809 cheers Martin
  9. 2 points
    An engineer would say yes and happy with that knowledge go on to successfully design high bypass turbo jet aero engines that fly thousands of passengers across the globe. A physicist would roll their eyes at the use of the term centrifugal. You have opened a can of worms now sunshine Jim
  10. 2 points
    I can do it in one - supportive.
  11. 2 points
    In GR gravity is caused by the curvature of spacetime. It predicts gravitational waves. Gravitons are an unobserved prediction from a yet to be completed quantum theory of gravity. The force you feel as the pull of gravity is in fact the push of the electromagnetic force between the material in your feet and the floor as it prevents your free fall along a spacetime geodesic. (Yes in Newtons theory it is a force but this theory is less accurate than GR) Regards Andrew
  12. 2 points
    I wonder how many times my bodily carbon will have been recycled by then?
  13. 2 points
    Handsome, Witty, Charming . . . . . . . but enough about me.
  14. 2 points
    M33 . I set the gain way higher than I normally do on this occasion and it seemed to work well. I think I normally worry too much about noise so keep it fairly low. Anyway field rotation was becoming too much of a problem after half hour of 18 second exposures. Zwo294 mc , gain 380, 20 darks and flats. 9.25 nexstar evolution. Gimp, snapseed, ps express.
  15. 2 points
    Case is perfect many thanks
  16. 1 point
    In case anyone is interested here's some images of spectra and the Lowspec from Paul Gehrlach's posts on the German forum: Daylight line spectrum in near IR The corresponding spectrum: The 3D Printed design of the Lowspec: I have quite a way to go with the build but have made a start! Louise
  17. 1 point
    For those of you wondering if it would be worth spending the time collecting Ha on the Hidden Galaxy, IMO....YES! Definitely. I did not know, and I heard this galaxy was faint and Ha was questionable, so I decided to collect the Ha for my HALRGB target and find out. The Moon is up, so I can't collect any other data...why not see if there is enough Ha for an HaLRGB image? You be the judge whether there is enough for you, but in my case, I definitely will be adding the Ha to the LRGB (if i ever collect it!, which I will heartily endeavor to do). I will be adding to this stack though--This is 7.5 hours in 300 sec subs using a TOA 130 and ASI 1600 (3nm filter). I would like to double this data or thereabouts. I lightly processed the stack--not quite enough to make a stand alon mono--but I did remove what gradients there were and used a little noise suppression and very little star control. just to bring out the Ha regions a bit. I'm encouraged by the presence of what appears to be a bar structure in the core. Rodd
  18. 1 point
    I agree with experiment part, but from what I know about RANSAC - tolerance is related to how much a star can move to be included in the match, or rather what is average displacement value. This can help if you have distorted stars in one or more subs and PI complains that it can't find enough descriptors to make a match or similar. RANSAC is process that happens once star detection is finished and PI already has a list of stars it is going to try to match over frames. It will not have impact on star detection.
  19. 1 point
    That is integration of already aligned images. From PI tutorial, there is this section: I'll check to see what options are listed in help to see if we can change something to aid detection process
  20. 1 point
    This is just "redistribution" of the noise - signal will be the same, and noise in general will remain the same over the image - it will just change it's distribution. It depends on algorithm used to rotate - interpolation. Some interpolation techniques give better and some worse results with respect to this. I'll do another example for you here and comparison of bilinear and more advanced interpolation. Here is "base" sub - nothing but pure gaussian noise: Here are two subs rotated by 2 degrees - one bilinear interpolation other cubic O-moms: These are two rotated subs - no pattern is yet visible as we did not stretch the subs to show the pattern. Now I stretched in particular way to emphasize this pattern - left one is bilinear interpolation - and it shows pattern clearly. Right one is cubic O-moms - pattern is there but to much lesser extent. Every algorithm will produce it to some level because you need to cut into higher frequencies when you work with limited sampling rate, but some algorithms handle this much better. If you use Lanczos 3 resampling - it should have this effect down to minimum.
  21. 1 point
    I did that with my DDM60 mount once when I was setting it up (At that time I had to plug red and black connectors into the PSU), wondered why nothing happened until I realised my mistake. Thought I'd blown up a £6.3k mount but it was only a fuse that blew which I could replace from Halfords. Big sigh of relief when it powered up OK.
  22. 1 point
    Sorted the 28mm hinge and support leg.. bit more tomorrow hopefully and we are almost done with the main part.. just seat and foot rest to go . Looks quite robust.. Ta Fozzie
  23. 1 point
  24. 1 point
    Keep the faith folks, someone will certainly see it - if you don't buy a ticket........... NEVER give up until it really is too late. Good luck everyone
  25. 1 point
    Baader Morpheus are superb and the 17.5mm will give you a spectacular high contrast view with a nice dark sky background.
  26. 1 point
    Just to amplify Skipper Billy's answer, there's a long(ish) article about UTC here: https://en.wikipedia.org/wiki/Coordinated_Universal_Time and a list of some of the centres that contribute to it here: https://en.wikipedia.org/wiki/List_of_UTC_timing_centers No longer a clock in the Royal Observatory...
  27. 1 point
    Yeah, I stand by centrifugal, what we’re describing here is the force felt when inside a spinning “centrifuge” no?
  28. 1 point
    My name is Jim , I'm an engineer and I believe in F = m^w2r Jim
  29. 1 point
    That'd be the Centripetal "force". What you feel is your limbs under strain as they are caused to continually change direction rather than continue in a straight line. The "force" is actually internal strain between the molecules in your body. Not an external action. Very Newtonian!
  30. 1 point
    It was amazing!! As soon as you'd posted that you were turning it, the sky cleared and was beautifully clear until (and after) I gave up and went to bed at 4am. Might have been later that the clear sky reached you. I was hoping you might be online a few minutes more to catch my reply. Sorry about that. When I went out to the observatory to close the roof there was a severe frost and the ground and everything else was icy and hazardous. I had to be very careful not to slip down!! Everything in the scope room was covered in ice except the mount and imaging rig which were giving off a small amount of heat. I was fearful that the roof might be iced up but it wasn't and apart from frozen hands the roof closed fine. Had a look round the sky and it was clearer than I've seen it for ages. When I got up at around 10am it was chucking it down with rain - what a difference!
  31. 1 point
    Reading all the posts since I turned in last night has me kicking myself as a pessimistic wimp. should have stayed with it, I might have got some [NII] to go with the HII. Now going to check my subs, see how many are usable.
  32. 1 point
    No worries, I'm just a bit surprised. I'll probably withdraw the ad soon and think up a plan for it.
  33. 1 point
    Sorry it hasn’t sold yet Chris, lots of aperture for the money. Would probably work well permanently set up on someone’s patio under a cover or ‘sentry’ style lift off box, and on a dolly. Sadly I’m not set up for this either.
  34. 1 point
    I removed only the diagonal, Stu. There was very little room for padding in the box I made, especially at the ends because length was the issue, but I carried it onto at least four flights. I reckoned that, since it would be with me all the time, I wouldn't need too much padding. My first view of the Rosette was with that scope, in the Spanish Pyrenees. I could never see it in the UK. Olly
  35. 1 point
    Just another note on aligning the mount with Polaris before observing - a rough alignment of the right ascension axis with Polaris is sufficient for visual observing. I find that getting the "north" leg of the tripod (arrowed in the pic below) pointing in the direction of Polaris is sufficient to give reasonable tracking for visual observing. Imaging is different - the alignment needs to be much more accurate which is where the small telescope built into the RA axis comes into play.
  36. 1 point
    Beautiful capture!
  37. 1 point
    It's those pesky Gremlins Gina the bane of all engineers Jim
  38. 1 point
  39. 1 point
    Kronberger 61 (Kn 61). also known as the Soccer Ball nebula, is a recently-discovered planetary nebula in the constellation of Cygnus. It was discovered in January 2011 by Mattias Kronberger, who is a member of the amateur group Deep Sky Hunters. It is very small (diameter of 104 arcsecs). It is barely visible on the second Palomar Optical Sky Survey (POSS-II) blue plate scan, suggesting a surface brightness well below magnitude 25 per square arcsecond - and at an estimated distance of 13,000 light years (1). It is a highly filamentary bubble with a high expansion velocity of 67.6 km/second. A crude kinematic age for the bubble yields 16,000 years (2). Astrodon Blue: 10x300" Astrodon Green: 10x300" Astrodon Lum: 19x600" Astrodon Red: 10x300" Astrodon OIII: 34x1800s bin 2x2 Total Integration: 23 hours Captured on my dual rig in Spain. Scopes: APM TMB LZOS 152 (6" aperture 1200mm focal length) Cameras: QSI6120wsg8 Mount: 10Micron GM2000 HPS (1) <a href="http://www.gemini.edu/node/11656" rel="noreferrer nofollow">www.gemini.edu/node/11656</a> (2) <a href="https://arxiv.org/abs/1406.4408" rel="noreferrer nofollow">arxiv.org/abs/1406.4408</a>
  40. 1 point
    I had not noticed the number of galaxies visible in this image before--On Astrobin under full resolution I lost count--so I figured on SGL it should be about the same. I took this image with a TOA 130 and the ASI 1600. About 15 hours of data. I hope it inspeires the galaxy hunters among us! CS Rodd Edit: I just revisited Astrobin and was surprised to see that full resolution there is MUCH bigger than full resolution here--very much closer in, so the image may noty imspire as much as I had hoped. Here is teh Astrobin link in case you want to see for yourself. https://cdn.astrobin.com/thumbs/EEHwLeuFVR4b_16536x16536_wmhqkGbg.jpg
  41. 1 point
    Well said @Rob Sellent, can never emphasise that enough. I was too scared to try a Herschel Wedge for a long time, they just seemed inherently dangerous to me! The reality is that if you educate yourself properly, and always have a methodical approach when setting up, they are perfectly safe. In some ways safer than a front filter as if anything happens to the wedge, worst case you get a hot leg, or the view degrades.
  42. 1 point
    Must be mad Adam judging on the quality of the data you've been posting lately
  43. 1 point
    Hope we get as clear skies at 2016. Here's some shots of the Mercury transit then that I took with my C11 on a NEQ6.
  44. 1 point
    Love it, "Brian Cox weekend bender" You have made great progress on the obsy, as i knew you would
  45. 1 point
    Pete Lawrence & Paul G. Abel have prepared an article on the BAA website about observing the transit and describing how to look for Mercury against the sun's spicule later in H_alpha. There is also a tutorial with more details about visual observing and imaging elsewhere on the BAA website.
  46. 1 point
    The open photo doesn't make much sense to me, why is the middle section still in place?? Ron
  47. 1 point
    A friend tipped me off that some clear skies were advancing in my direction so at 7pm I ventured out with the big 12" Dob' for its second outing since buying it second hand a few weeks ago. The 12 dob just fits through the door frame and settles nicely on a concrete patch in the patio and on went the tube. I used a laser collimater to align the scope having attempted to collimate the collimater earlier in the week (it was way off). Connected up the battery and started to align. The sky was looking very grey with the rising moon, streetlights and damp in the air from rain during the day so I wasn't sure what I would be able to see and as this was an unexpected outing I hadn't prepared any particular targets to vue either. For some reason the suggested alignment stars always seem to below the fence or behind a house. I settled on Altair and Mizar. Mizar making a nice double to start the evening. Taking my tour around anticlockwise to start with I slewed to M13 as a nice easy target. The cluster showed up clearly against the grey sky with a 15mm EP and a number of outlying stars could be resolved, the centre starting to look a little grainy The next target was M57, the ring nebula. This landed in the right half of my 25mm EP fov so I guess my alignment was a bit hurried. The ring was unmistakeable and it was nice to be able to look at it directly and then see even more with averted vision. My CLS filter and the 15mm ep helped to subdue a bit of the grey background. Then came M27, the dumbell nebula, which was also nearly overhead. Ive seen it clearer than this night, but it was again an obvious misty patch looking a slightly rectangular in shape. The CLS filter helping a little bit to subdue the background again. At this point I noticed that my stars were looking a little astigmatic so I checked the collimation. I dont know if the scope had just settled a bit or I had jogged the flextube, but it wasnt quite right. I also noticed that the standard skywatcher EP adapter tilted the collimater when the screws were tightened. Returning indoors for a rummage in a box of bits, I returned with a Baader 2"-1.25" adapter and the collimater sat nice and squarely in it. The collimation needed a slight adjustment and was rewarded by some nice dark circles right in the middle of any out of focus star images. The moon was now advancing and blanking out most of the sky so I switched to some star clusters. M103 came first which revealed its lovely triangular shape with the red giant star showing clearly near the centre M29 came next, slewing back over towards the west now away from the moon, which is a new addition to my Messier collection. The small triangle and rectangle were quite clear and reminded me of the Pleaides (which were still behind the tree near the moon). M39 was another addition to my Messier collection and appeared as a rather loose collection of stars. In spite of the large number of stars in this region the open cluster was clearly a cluster of stars although I couldn't pick out any memorable shapes. M34 was the final cluster of the night. The cluster was clearly visible in a 25mm EP even though the moon was now quite high. The drop in temperature seemed to have cleared some of the mistyness from the air - and deposited the water all over my scope. To close the evening I toured the western edge of the moon. This is an area I haven't explored in much detail and there were a number of significant craters with central peaks casting long shadows onto the walls. I must learn what some of these are. The air must have steadied since I was able to use an 8mm EP on the 1500mm fl dob to get some nice close-in views. The dew was falling heavily by 11pm, my secondary had started to mist up and thin cloud was drifting back across the sky so I called it a night. A very pleasant and un-expect night out and all tucked up by midnight. I must get my pencils and pad ready next time for some sketches. PS - loving the posts on here for some great ideas of things to look at.
  48. 1 point
    Here's my first image with this lens taken at the end of March, had to send the first one back since the stars were awful in one corner, this one is much better though! ? Nikon D5300 49 x 90s @f2.8 Iso 400
  49. 1 point
  50. 1 point
    I use this fine focuser, it’s very helpful, if not a bit fiddly to put on. http://www.astrokraken.fr/samyang-135mm-f-2-bracket-micro-focuser-a145773756 Edit just noticed he does a hinged ring version which looks better http://www.astrokraken.fr/micro-focuser-with-hinged-rings-for-dslr-telephoto-lens-a145773206
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