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NGC 1502

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NGC 1502 last won the day on October 25 2013

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  1. Good luck, but TV Wide Fields are hard to find in Europe. You’ll have a much better chance of finding Panoptics because they were imported in far larger numbers and of course available new. Panoptics replaced the Wide Fields and are better corrected. However I do like the classic appearance of the TV Wide Field, understandably that may be what you find attractive
  2. Contacting Cardiff Astronomy Society is a good idea, currently they’re meeting on Zoom. However if it were myself I’d first want to meet the Society members in person (when that’s allowed) before venturing somewhere remote with an individual you’ve never previously met. Safety first
  3. For optical mirror rinsing another suitable option is reverse osmosis water used for tropical fish. Take a clean container to a reliable aquarium shop and ask...
  4. Hi to users of the popular 8” SCT. I’m trying to advise someone regarding solar observing with an 8” Celestron SCT. The user is familiar with the essential idea of using proper filters designed for the task and securely fitted. His enquiry relates to suitable magnifications, his lowest power is currently 80x with a 25mm eyepiece. When I’m solar observing I generally use far lower powers than 80x because that gives a sharper view in the often turbulent daytime atmosphere. Options include a 32 or 40mm Plossl for 63x or 50x, or an f6.3 focal reducer to obtain lower powers. I’d be ple
  5. As above, focal ratio determines how useful a spherical mirror is. Examples- A 6” F4 spherical would be very poor. A 6” F12 spherical would be fine, but much harder to mount effectively.
  6. I’ve just searched and found the manual. Page 32 of 36 has the diagram of the part in your picture. I’m puzzled because it basically says what you have, the clutch knob should change resistance on the DEC movement. Just a possibility- maybe remove the clutch knob and check for debris on the thread? Or tighten it hard to free it up? Or is a washer missing so the knob cannot properly clamp the movement? Hope you sort it, Ed.
  7. Excellent sketch and a realistic portrayal of what’s seen in the eyepiece. Also a testament of how good mass produced optics are these days
  8. Hi Mike, I’m liking your lo-tech approach similar to my own. Double stars are a favourite of mine, the whole sky is stuffed with them at every season, they’re hardly affected by light pollution, great fun with their variety. A slightly deeper study includes a great deal of how the universe works - Proper motion, star types, orbits, etc..... Lots of online resources to help us find the more obscure doubles as well as the more popular examples. My main resource is the “Cambridge Double Star Atlas” version 2. Ed in the UK.
  9. The doubles I observed included- Algeiba in Leo, Iota and Zeta in Cancer, Rigel and Sigma in Orion, Beta in Monoceros. All nicely resolved in the 80mm Vixen apart from Zeta (Tegmine) in Cancer - easily resolved as a double but it takes one of my larger scopes to resolve the 3rd component. Mu Cephei is in Cepheus almost overhead as soon as it gets dark at this time of year, yet another fine sight For me the best of the above is Beta Mon. Cracking triple nicely resolved in a small scope. I get as much fun out of my small scopes as my larger ones..... Ed.
  10. Your lovely Takahashi will eat this no problem. 4” Tak ? no I’m not envious, just VERY envious Cheers, Ed.
  11. With thanks to wibblefish for mentioning 119 Tauri, I’d not heard of it previously. In a rare clear slot last evening I went out with one of my small refractors, an elderly Vixen 80mm made in the 1980s. 119 Tauri is slightly variable at +4.2/4.5 magnitude. From my back garden it’s just visible with difficulty to the unaided eye. At 45x the red colour was obvious and a fine sight. Lots else followed, mainly double stars, but nice to view a new to me object. Ed.
  12. Sounds like a good idea to me. Selling the 72mm & 80mm will raise funds to offset buying the 90mm. If you’re able to, perhaps buy the 90mm before selling your 2 current scopes, to make certain you like the new one..... Hope it works out for you Ed.
  13. Excellent thanks for that . Red stars, often carbon stars, can look very red indeed perhaps the most obvious colour seen visually in a telescope at night. I’d not heard of 119 Tauri and will check that out when I can. When you’re hunting for M1 there’s a cute double star just 0.5 degrees east- that’s Struve 742, mags 7.1 & 7.5, 4 arc sec separation, nicely resolved at medium power. Splitting Sirius from its faint companion is a tough call. Multiple tries of mine have failed over the years....succeeded on just one occasion with my 10” Dob. The “pup” as it’s called was seen at
  14. Perhaps for silicon glued primary mirrors you could dismantle the complete cell, separate the mirror and the plate that its glued to from the tube plate then wash in the regular way. Extend the drying time to allow trapped water to dry out thoroughly. The tube plate complete with bolts & collimation springs don’t go anywhere near the water. Ed.
  15. Some good points made. I suppose you could separate the mirror plate from the tube plate that attaches the complete cell to the tube. That would ensure that the tube plate with bolts and collimation springs do not get wet. That would leave the mirror still attached to the mirror plate for washing - this avoids undoing and replacing the mirror clips, some folk are wary of over tightening the clips causing problems. Personally I don’t do the above, just completely dismantle and wash the mirror on its own, carefully reassemble and re-collimate. It’s not the least difficult when you’ve do
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