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Everything posted by Tomjo59

  1. Looks just like my dewshield (also on an 8” Dob). Made from an old foam rubber excercise mat. it definitely helps keep extraneous light out, and my secondary doesn’t dew up any more
  2. Looking at the forecast, looks like I’m not going to be playing for at least a fortnight! Jet stream forecast offers no hope either.
  3. Brilliant picture; did you take that through the Dob? (Only joking!)
  4. Brilliant image, great resolution. Congratulations!
  5. Nice clear images Stephen. Sky and Telescope magazine have two very good free apps you can download, one for Jupiter and one for Saturn, showing the positions of the moons.
  6. It would be a pity indeed if visual observing declined, but as other posters have pointed out, it may be due to circumstances, particularly light pollution. I used to occasionally attend a get together of amateurs for a night’s observing here in the New Forest. At first, it used to be almost all visual, with people chatting, and wandering around looking through each other’s scopes; it was very ‘social’. As time went on though, more and more would bring along imaging kit, and most of them would spend the evening hunched over laptops, and not engaging very much with ‘non-imagers’. a pity, I thought.
  7. Located Neptune without too much trouble over the last three nights, though the seeing here in South Wiltshire was poor last night compared to the previous two; weather is definitely on the change. A question I would like to ask though, is has anybody on here managed to glimpse Triton on anything smaller than a 10” reflector, or equivalent? There seems to be a view that a 10” is the minimum required to achieve this, so am I wasting my time trying with an 8” Newt?
  8. Bet this produced a meteorite. Probably at the bottom of the English Channel now though!
  9. Starting to (re)appreciate just how pleasurable to use a good pair of binoculars are. So hoping to buy a pair of Helios LightQuest-HR 80mm Binoculars soon, with a pistol-grip tripod head. This following the advice given on Steve Tonkin’s excellent Binocular Sky website.
  10. Lovely looking ‘scope. Hope you enjoy using it! That ‘wheelbarrow’ arrangement for moving it around is a nifty idea.
  11. Exceptionally clear here in south Wiltshire last night. Grabbed a met office map for midnight. I believe this situation, between two anticyclones and two low pressure areas is called a ‘col’. I don’t know if this is generally regarded as favourable for good observing conditions?
  12. For the astrophysics of stars specifically, I recommend ‘Starlight’ by Keith Robinson. This is published by Springer, and is in the ‘Patrick Moore’s Practical Astronomy Series’. An excellent introduction to stellar physics, with clear explanations.
  13. I think it’s called ‘dumbing down’. Seems to afflict most of the media these days. Not sure there are any real journalists, who actually investigate stories anymore. They seem to cut and paste each others opinions.
  14. Has anybody noticed that the forecast on the BBC Weather site changes virtually by the hour? Almost as if they stick their heads out of the window, and think ‘we got it wrong, better change the forecast quick’. Very unreliable beyond the current day.
  15. Yes, I’ve seen those, and theories such as the ‘Grand Tack’ seem very speculative (some might even say contrived), and are not without their problems (see https://en.m.wikipedia.org/wiki/Grand_tack_hypothesis, for example). I suppose that is how science progresses though. I suspect that the uncertainty and complexity of the theory is why Cox didn’t really mention the mechanism by which the migrations took place.
  16. Looks fantastic. They should make it permanent, if it is only temporary.
  17. A fair question. I can’t imagine it would have had a ‘comet-like’ orbit, and I assume that a change of a more normal elliptical orbit would have to be related to a change in the overall angular momentum of the solar system, especially the relation between the Sun and Jupiter.
  18. I’ve watched the latest program of Prof Cox’s ‘The Planets’ series, about Jupiter. He states that computer models of the solar system’s formation indicate that Jupiter migrated towards the inner solar system quite early in its history, explaining several ‘odd’ features, such as the small size of Mars, lack of ‘Super Earth’s’ etc. Jupiter then migrated outwards again, apparently. However, it didn’t seem clear from his description exactly WHY Jupiter should have performed these migrations. Did I miss something?
  19. Many, many times on here, I’ve seen recommendations for ‘Making Every Photon Count’ by Steve Richards. As getting into astrophotography is something I have considered for a long time, as a natural extension of my lifelong visual pursuits, I bought a copy. It is indeed an excellent book, and I’m very glad that I spent the twenty quid on it, but not for the reasons you might think. Having read it, I decided that I would have neither the time or the patience required for acquiring and processing (especially the latter) deep sky images. Consequently, it may well be that spending twenty pounds now has saved me vastly more in the future! The book only deals with deep sky imaging, and it may be that I still have a go with webcam imaging of solar system subjects, which looks a lot less faff. Just my opinion, of course, and I have the greatest admiration for those who do take the time and trouble to produce the breathtaking deep sky images we all enjoy seeing.
  20. Orion Optics (UK) CT10L 250mm f6.3 Ultra Newtonian for sale Reluctantly selling, as getting a little too heavy for me to carry out to the garden these days. Will be replacing with a 5” refractor on an equatorial mount. This scope has given me many hours of pleasurable visual observing, with superb views especially of the moon and planets. In excellent condition, features carbon fibre sandwich tube, Orion Optics Dobsonian mount and Teleskop Services (TS) 8x50 straight finder scope. Primary mirror has a few dust spots, but nothing more serious (didn’t have the courage to remove and clean it before selling!) Three cooling fans in base of primary mirror cell. 2" Focuser (OC1-M) with reduction gearing and 2”/1.25” adaptor. Enhanced Hilux optical coatings, 1/10th wave PV. Comes with original Zygo wavefront analysis sheet from Orion Optics, dated Sept. 27th 2011. Focal length 1575mm. Weight of tube alone 12.5kg, with rings an additional 1.5kg. Tube fitted with carrying handle. Adjustable 4-vane spider, holding a 50mm diameter secondary mirror. £800. Open to sensible offers. Cash on collection. Due to size and weight, definitely collection only!
  21. Thanks for that Mike. I’ve come to the conclusion that as far as deep sky is concerned, visually, one faint fuzzy blob looks much like another. I just think a good ED refractor will be better for my main objects of interest, planetary, lunar and solar - and much easier to move around. It would also suit webcam astrophotography of these subjects if I try it at a later date.
  22. It's easy to take things like this for granted these days, but just stop for a moment, and think how incredible such an image would have seemed just a few years ago - of an object 600 ly away! We live in amazing times of discovery.
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