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Everything posted by Pixies
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But with the accelerating expansion of the universe, and distant objects accelerating away from us faster than the speed of light, could there be a point when a galaxy has moved beyond the observable limit and will just vanish to us?
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Whatever happened to the old fashioned 'Wales' unit of area? It's political correctness gone mad, I tell you! And anyone of my age knows that an asteroid is measured in good old British donkeys! One 'so-called' giraffe is 3 5/8th donkeys.
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The 6 spikes will be from the hexagonal edges of the mirrors, but I assume the smaller 'horizontal' one is from the secondary strut: Apparently it's getting 0.07 arcsecond resolution! 🤯
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Thanks. I've little knowledge of PSU electronics so wasn't sure if this was the most suitable type of transformer.
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Yep - negative inside. Hence the guitar pedal PSU - one of only a few types of consumer device that uses that polarity at 9v!
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Hi, My new (to me) Vixen SP is about to be motorised. The motor controller takes 9v and I'm currently using a guitar effects pedal PSU to power it (it has the correct polarity!) Anyway, I have also just acquired a 12v powertank, mainly for dew bands, but would want to use this to power the motors too. I am assuming a simple step-down transformer would be appropriate for this? Something like: https://www.amazon.co.uk/EBILUN-Converter-Voltage-Changer-Regulator/dp/B07HCW454P Any comments or suggestions on what wold be most suitable? The max current draw would be 1A
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StellaLyra 12" Dob - the good and the bad
Pixies replied to Mr Spock's topic in Discussions - Scopes / Whole setups
Just saw Ed Ting's video about these yesterday! -
Keep your eyes open for an older aluminium Manfrotto 055. Avoid the more expensive '055PRO' models which have a boom-type arm, which you won't need. Don't extend the legs fully, either - just 2 out of the 3 sections. As it's for AP, don't extend the legs at all, it'll be very stable then. You can find them on ebay used for around £30 if you are lucky, as prices vary wildly. Sometimes they have a head attached and around £50 but then sell the head for £20 and you're sorted. Here are some examples to keep an eye on: https://www.ebay.co.uk/itm/384777476735?hash=item5996865a7f:g:mD8AAOSwlJ9iLK-q https://www.ebay.co.uk/itm/203867280095?hash=item2f776fd2df:g:WmUAAOSwczNiLhcO https://www.ebay.co.uk/itm/185337755641?hash=item2b26fdb7f9:g:gisAAOSwciZiLgBS The latter one is an older type with screw-type leg locks rather than the snappy flip-type. Doesn't really matter.
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Keeping image quality when sharing online
Pixies replied to Iem1's topic in Getting Started General Help and Advice
This - and 24bit PNG format, which retains high frequency detail better on Facebook. -
Sorry to bang on about LROC, but just discovered a feature I hadn't noticed before. Under the experimental features section: select 'shaded relief +WAC no shadows': It will try to render the moon with correct shadows according to a surface relief map. And get a load of that relief map:
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Here's a tip with the LROC quick map: In the key section, under Overlays - select 'Sunlit region' - and it will set the phase of the moon. It won't alter the shadow direction appropriately, though: However, under the LROC Basemaps section, have the following selected (and no others): Click on the slider button for "WAC Nearside (big shadows)": use the opacity slider to swap between the shadows for each later, and you effectively get to adjust the shadow direction (sort of): You can also adjust the date and time (bottom right of the screen) to select different phases.
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StellaLyra 80° 20mm 2" eyepiece - first light report.
Pixies replied to cajen2's topic in Discussions - Eyepieces
"Vixen dovetail"? -
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Field of view orientation with dobsonian
Pixies replied to Stephen_M's topic in Getting Started General Help and Advice
I just sing, "Go West..." -
BST StarGuider 60º 8mm ED Eyepiece - Taken The Plunge...
Pixies replied to a topic in Discussions - Eyepieces
There are a few just gone up on the For Sale forum -
AZ mount in EQ tripod
Pixies replied to PatrickO's topic in Getting Started Equipment Help and Advice
There's this: https://www.astroshop.eu/other-adapters/astoptics-photo-adapter-for-eq3-eq5-tripod/p,57914 But it would be cheaper to get a new tripod! Although you can get a Chinese version: https://www.aliexpress.com/i/33063326742.html or DIY: -
Trying out some new eyepieces today. Didn't really get a chance to put them through their paces properly - transparency wasn't great but seeing was good. Using the 8" dob. The neighbour had left his spare room light on and curtains open, though! 😠 Started with M67. Not the best view I've had recently, but the red star to the north of the cluster was showing its colour nicely. Only the 2 bright Messiers of the Leo Triple were obvious tonight, too. M3 was also a little under-par tonight. A high haze I think. So on to some doubles, then. 54 Leonis very easily split in the 22mm LVW. Pale blue and steely green/grey. Colours better in the 13mm Izar (Epsilon Boo) was split easily in the 10mm Vixen NPL (120x) Alkalurops (Mu2 Boo) - the tight pair of the triple was split at 120x also, but variably as the seeing shifted. Zeta2 Coronae Borealis - Pretty blue and green pair, easily split in the 22mm (55x) Looks like a few clear nights coming up too! 🥳
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Yeah - like I got those by mistake!
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All Vixen 22mm and 13mm LVW 15mm SLV 2x 10mm NLPs 1.25" prism diagonal 2x 'deluxe' barlow Some were a job-lot, so I might be offloading a few bits. The latter 2 items have pretty old-school clamp screws so not really designed for anything heavy, but my completist bone is itching!
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@cajen2 - bring 'em all down to Astro Camp and I'll help provide an unbiased second opinion!
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Very nice. B&Q also have a range of 'dollies' that I have used to move furniture! https://www.diy.com/search?term=dollies
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I managed to find a suitably sized metal flight case (secondhand) and put my 60x10 RACI finder in there along with my Telrad. I'll post a pic when I get home, but I managed to cut a suitable hole in the foam to hold it (in rings) securely. It does look like I did it with a blunt spoon, though!