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chiltonstar

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About chiltonstar

  • Rank
    Sub Dwarf
  • Birthday 19/12/45

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  • Gender
    Male
  • Interests
    Wildlife photography + astronomy of course
  • Location
    Wessex/N. Berkshire Downs
  1. Certainly dust or haze seems to change the colour of the GRS, at least with my eyes and scopes! Algieba is a lovely pair, isn't it? A good one to show to newcomers at outreach sessions, as it always looks the same orangey-yellow colour! Chris
  2. I managed an hour before the cloud returned, but the seeing wasn't brilliant and Jupiter was just above a neighbour's CH flue, although I did just spot the festoons - best viewing at x190 with the 180 Mak. I moved the scope well away from the house and looked at a few close doubles, but the seeing on these was not brilliant either, so I assumed it was weather rather than heating plume.... Chris
  3. I caught the Io and the shadow transit after the rain - excellent seeing, with the shadow an inky black dot at x150 (Baader Classic ortho, 10mm) and occasional views of Io itself as it moved over a darker area. Nearby Porrima showed near-perfect diffraction rings, so the seeing was 4.5 to 5. Chris
  4. GRS

    I'm not sure if that is a compliment or not...... I put it down to the very high caffeine levels in my blood (Espresso, Lavazza strength 5). Chris
  5. GRS

    Must be my ancient eyes, but for me it changes colour every time I see it: more red this year than last, paler in a Mak cpd with my fracs, paler when there's Moon or haze and paler with higher mag than at say x125. Chris
  6. GRS

    I had a half hour here between clouds (50% cover) with my 127 Mak - excellent seeing bizarrely as it was still spitting with rain, but the GRS was a nice pale salmon pink colour at x190. With the warm night and moisture came the first of the mosquitos! Chris
  7. Interesting article! Using the approach outlined, I imagine the spot diagrams for fracs and newts would not look very different, as each is the convolution of the Airy disk and diffraction rings, plus the seeing effect. Although the disk and rings for the frac would look slightly different, broadening it in this way with the seeing function would tend to minimise any differences between the scopes themselves, I imagine. The real difference would be with visual observing, where the seeing allows you to see the Airy disk and diffraction rings in moments of good seeing. Chris
  8. A nice pair of transits, with shadows + GRS tomorrow morning just before dawn for anyone not permaclouded!! Chris
  9. Too true! Better to be sitting in a traffic jam in a Ferrari than a Ford Escort! Chris
  10. It is supposed to......and certainly does for me, particularly for viewing objects like Jupiter and Saturn at low altitudes. I also try to avoid the heat plumes above my neighbours' house, and downwind from my own if possible (not always), but as ever, it's a compromise. Chris
  11. A very thoughtful observation. We've all been battling the seeing this year I think! Another factor to be borne in mind is the rate of cooling of the atmosphere (dT/dt) which has a worse effect on a larger scope than a small one, which reaches thermal equilibrium more quickly. Additionally, I find a huge difference between putting the scope on grass looking out across grass, compared with looking over concrete or roads, both of which have horrendous thermals. it will get better though when the evenings are warm and humid, and the air doesn't cool as much...... Chris
  12. Well done - a milestone! Last night here there was some haze which made the GRS less obvious - you may sometimes find the same. Some nights it is blindingly obvious and quite brick red, others barely more orangey than the belt itself. Happy Jupiter watching! Chris
  13. The GRS is an amazing thing to see for the first time - it changes year by year so keep looking! The double star might well have been Porrima (Gamma Virginis) which is very close to Jupiter (just above it and to the right) at the moment - a pair of white/yellow stars which are close but can be resolved with even a small scope (2017). Chris
  14. As well as the size difference, I find that the moons "shimmer" differently with the seeing, presumably because unlike stars, they are not point images. Even with my wee ED80 tonight, I could see Ganymede clearly as a disk. Chris
  15. Yes, a bit washed out with the haze here too, but the seeing is good. I used my mini grab 'n go (ED80) at x120 and x180 to get the sharpest views in the conditions. Porrima nearby lovely as ever - a spectacular double. Chris