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clarkpm4242

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Everything posted by clarkpm4242

  1. Hale-Bopp got upto 40 degrees long. Moon is about 1/2 degree...
  2. Hi As a long time abuser of large aperture dobsonians I'd recommend at least 1/6 wave (gives a bit of slack on 'diffraction limited') and high reflectivity coatings. At least on the secondary. You don't want to be moving around all that heavy aperture without reaping maximum rewards When you get familiar with what you can see through large apertures, you do notice the difference. Spend, spend, spend... Cheers Paul
  3. http://en.wikipedia.org/wiki/SN_2014J#Properties
  4. Was under dark skies over the weekend. It was clearly visible though my 92mm TMB refractor. Also viewed through a 22" dobsonian. An obvious colour difference to the nearby star. Yellowy/golden. Don't now if this an attribute of the SN or caused by dust in M82. Cheers Paul
  5. The Orion SkyQuest 14" base will fit through a standard doorway, assembled or disassembled.
  6. The primary mirror in a newtonian becomes cool enough to create a cold boundary layer of air next to the mirror surface. Dew is formed from this layer. One method of preventing dew is to keep air moving across the surface of the mirror preventing the cold layer forming. Fans situated to the side creating a laminar flow across the mirror do this. A very low power heater is best for the secondary, that is used to prevent dew in the first place. Similarly a wraparound heater strip for refractors. HTH Paul
  7. Hi I think this is probably harder than the Horsehead to observe. Needs transparency and good seeing with good optics that can take higher power. I used an 18" Obsession. Another good one for the late summer/autumn season is Pease I in M15. Good luck! Paul
  8. A bit of a simplification. As it gets nearer, you would think brighter, however the same amount of light is spread of an apparently larger object decreasing brightness per unit surface area. It wouldn't really appear 'brighter'. Don't think I'll wait Cheers!
  9. For those wishing to observe from this area it is worth noting that the military at the Otterburn Ranges do light up the sky on a regular basis. The southern sky from the NNP can get quite lively. https://www.gov.uk/government/publications/otterburn-firing-times Probably not an issue from Kielder. Also the glow from Newcastle is less. Cheers Paul
  10. Great news! Every bit helps. Have been observing from the Elan Valley many times. Just back from a week there only 3 hours of clear sky but magical as always. I've had slightly darker skies from D&G.
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