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chrisrnuttall

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Posts posted by chrisrnuttall

  1. Thanks Seb

    I know what you mean about daytime observing, there's something cool about the fact that these plantets are still there in the daytime sky, it's just that most people don't think they are - like it's a sectret or something!

    Anyway, I can't do eastern horizon observing from my garden, the house is in the way! So this is the end for me for a bit.

  2. Hello

    I was sitting at work on Thursday, and I noticed that the sun had come out to play so I went home to do some astronomy, you've got to get your priorities straight haven't you?

    I set up my scope at about 15:30 and then began to search for Jupiter using my 50mm finder, and my 50mm binos.

    There was a bit of whispy cloud still in the air, but by 16:30 it had cleared and I was able to spot Jupiter in my finder.

    The first sketch was made at 16:45.

    The sun was still 5° above the horizon and the sky in the eyepiece was so bright that it washed Jupiter out quite a lot; a yellow filter helped with this a little and I was able to pick out a fair bit of detail. The seeing was good, about Ant II.

    The SEB revival area stretched right across the disc and was a mottled tan colour with slightly darker edges.

    The NEB sported it's usual ( for this year) mix of white ovals right on the Northern edge, and darker ovals nearer the middle.

    The Southern tropics were notably darker and browner than the North, which was smooth and orange.

    The seeing became terrible as the sun set at about 17:15 so I had a break.

    The second sketch was made at 17:30, the sky was by now much darker, Jupiter was visible to the naked eye if you knew where, and the moons were visible in the eyepiece.

    The planet's rotation had carried the middle section of the SEB revival across the disc and now the tail end was visible. There was an extremely narrow white rift starting near to the LHS limb and widening as it crossed to the other side of the disc. Its edges were noticeably lumpy, uneven and wave-like; it widened as it crossed the disc until the SEB was reduced to a pair of parallel dark lines close to the RHS limb.

    There was a dark brown mass in the SEB just to the right of the CM, it appeared to project southwards out of the belt slightly.

    The STB was noted during this observation and it was not seen in the first sketch.

    Seeing was Ant II to III this time, again a yellow filter was used as well as the unfiltered view.

    Both sketches at 218X

    post-17454-133877537452_thumb.jpg

    post-17454-133877537459_thumb.jpg

  3. Really good, colours are very, lovely.

    I have been tempted to have another look at this storm recently, but your sketch looks a lot like mine from over a month ago, I guess it hasn't changed all that much. Was it easy to spot?

    BTW I like your shadow of the rings on the disc.

  4. Very nice Paul. Did you add a blur to simulate the poor seeing? Mine really needed gif animation to make it swim about on-screen!

    I too have just been swapping between our drawings, your obs time was getting on for three quarters of an hour after mine so the details are not directly comparable but it is fun never the less.

    Incidentally i have seen colour in EZ ovals this apparition, i saw them a pink-ish, but recently i keep seeing large white ones.

  5. Hello again

    here is a drawing of Jupiter from Saturday afternoon.

    I set up the scope and left it to cool while I searched for Jupiter with my 10x50 binoculars, It took about 30 minutes for me to find it and align the scope to it as it was still broad daylight.

    Once i got it centred I popped in an eyepiece and the image was terrible, boiling and wriggling about all over the place. Ant V or IV.

    Things did not improve much over the hour and it made no difference how fast I ran my (considerable) cooling fans, so I can only conclude that the air above me was churning around a high speed. However the image was sharp despite its constant motion so some details were noted.

    The SEB at this longitude is pretty much complete, albeit with a paler patch just rising into view. It is much less red that the NEB, and a little weaker in colour too. The GRS had recently set to the left hand side of the disc.

    Callisto is approaching Jupiter for a grazing transit of the SPR.

    post-17454-133877532411_thumb.jpg

  6. Hello

    Here is a drawing of Jupiter from Friday afternoon.

    Having already got in some good overtime in the first half of the week, I sloped off early from work and got my scope out.

    I located Jupiter sweeping the sky with 10x50 binos just before sunset.

    The seeing was good at first, about Ant II, it quickly became unstable and eventually ended up at Ant IV, but I had to take my son to Hockey practice at half-five anyway!

    Cold, still, and partly cloudy.

    The sky was mid blue when I started and faded to a 'midnight blue' by the time I made the sketch.

    Orion SPX200 with TV 2X barlow and TV11mm plossl = 218X

    The SEB has two halves, the SEBn is the thicker and darker, it contains many very dark ovals; The one next to the GRS was so dark I mistook it for a moon shadow at first.

    The SEBs is broken by the GRS, which has wrapped itself in material from the belt, and looks to be a paler orange colour than previously this apparition. The section of the SEBs following the GRS seems to slope northwards to meet the SEBn at the following limb.

    The STB is disturbed proceeding the GRS and it is double following it.

    The NEB has many dark ovals and uneven edges.

    Gannymede is emerging from occultation.

    post-17454-133877525086_thumb.jpg

  7. Hello

    Here is another drawing of Saturn. This is from this morning, Thursday 20th Jan.

    I observed from 05:15 to 07:45, and watched the storm transit the disc. The seeing was okay but not anything special. Ant III, with brief better spells.

    My best view of the storm was at 06:30 when the brightest part was near the centre of the disc. At this time it appeared as a bright white horizontal strip with a crisp edge, and perhaps a tiny amount of very pale blue within it.

    The NtrZ proceeding it was pale and bright. Following it, the zone was its usual dull yellowy colour.

    Still I have not seen the kind of detail visible in some webcam images, and I think excellent seeing must be required for this.

    post-17454-133877520345_thumb.jpg

  8. Hello

    Here is a drawing of Saturn from this morning.

    Observed from 06:15 to 07:20

    0°C with sharp frost, still, clear, seeing started at Ant III, became slightly worse and then got better again, before nose diving at 07:30 to 'Antoniadi - pack up and go inside'.

    I watched the brighter part of the storm creep onto Saturn's disc over the course of the hour, getting one or two brief glimpses of sharpness, but mostly a soft wobbly view.

    Still it was better than last time!

    Interestingly I noted a darker division between the proceeding end of the brightest section and the dimmer 'tail', which I have seen on other drawings.

    post-17454-133877520008_thumb.jpg

  9. Hello

    Here are two drawings of Saturn from this morning.

    Conditions were terrible, and any sane person would have stayed in bed, but I have got up early only to be thwarted by the weather for every presentation of this storm on Saturn's CM since I first (and last) observed it on 23rd December, so when I could see the odd star through the clouds I decided to have a go.

    It was very windy and the sky was full of fast-moving broken cloud, but between telescope vibrations and clouds, I did get enough of a view to make these drawings.

    In drawing 1 the NtrZ is pale and bright, its right hand half is brighter still - about the same brightness as ring B's outer edge. This is the main storm and is the source of the bright material spreading away to the left.

    When I last observed this storm it was easily the brightest feature on the planet by a couple of points, but it was smaller and the NtrZ was still yellow around it. It has clearly spread out since.

    In drawing 2, the 'tail' of bright material has set and the main bright area has crossed the CM, its following edge is quite well defined and the zone is yellowish following it.

    Note, no detail was seen in the storm as conditions were too bad, in fact ring C could not be seen either.

    post-17454-133877518573_thumb.jpg

    post-17454-133877518582_thumb.jpg

  10. Sorry but no.

    The attraction of each pair of magnets is exactly cancelled out by the repulsion of each pair, so you gain zero propulsion. While the disc is spinning you will generate eddies in each induvidual magnet due to the hall effect, these will cause small magnetic fields which oppose the movement according to Lenz's law. So you start the disc spinning and even if you suspend it in the middle of a vaccuum it will slow down and stop.

    It would work better without the magnets, like a satellite spinning in space that spins for ever; but it is not a free source of power, it is simply conserving its kinetic energy due to zero friction.

    My day job is head design engineer in the UK's leading museum and leisure attraction theming company. We design and make a lot of weird and wonderful things, but perpetual motion is not one of them.

    Anyway this is an astronomy forum......

  11. Paul

    I made a drawing of Jupiter on the 3rd of January (posted in this forum). I knew the GRS would be on the rising limb of the planet so i didn't expect to see it due to limb darkening and forshortening.

    Anyway I was at the eyepiece longer than I realised and only after I came in I realised that the GRS should have been visible on the Right hand side of my finished sketch having moved fully onto the dge of the disc, but I hadnt noticed it.

    I thought I had somehow missed it ( which puzzled me a bit) but this may well explain things.

  12. Chris, Seb, thanks for the kind comments.

    I was suprised when I saw the arches but observing in twilight really helped. 30 minutes later as it got darker the level of detail dropped dramatically !

    I have read a little about this and it is supposed to be to do with the planet's brighness creating too much contrast against the night sky and therefore becoming so bright that the EZ just looks white, but in the day this problem doesn't happen, I have observed mercury and Venus in broad daylight many times before, but I can only recall seeing Jupiter against a blue sky once, I may give it a go this weekend...if the kids can behave long enough!

  13. You have captured some nice subtle detail there. Good work. I would imagine your drawing requires a lot of patience.

    I really enjoy the whole thing, i find the drawing very relaxing to do, it's a nice escape from my rather hectic and stressful job by day!

  14. Yeah, that's it, if it weren't for light pollution my 8" would give great results on DSO's, but as it is they are always a little underwhelming, and i live in a semi rural location!

    so it's either move to somewhere remote, or get a huge telescope.

  15. Toby

    I do much mure plantary drawing than Deep Sky (my skies are not that dark) so it's not really my strongest point, and I too sometimes struggle with the subtle tones required on deep sky sketches.

    I can't really offer much more advice on hopw to mqake the Neb look better, just keep trying different aproaches.

  16. Hi

    Here's a drawing of Jupiter from tonight.

    I observed at 18:30.

    Seeing was so so, about Ant III. Slight breeze and thin cloud forming later.

    The SEB revival area actually looks like a full belt at a casual glance now, but upon further inspection it is lumpy with knots of brighter and darker material, and something which looks a bit like a faint dark spot.

    post-17454-133877516132_thumb.jpg

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