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About Earl

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  1. from wiki Definition of a moon Size comparison of Earth and the Moon There is no established lower limit on what is considered a "moon". Every natural celestial body with an identified orbit around a planet of the Solar System, some as small as a kilometer across, has been considered a moon, though objects a tenth that size within Saturn's rings, which have not been directly observed, have been called moonlets. Small asteroid moons (natural satellites of asteroids), such as Dactyl, have also been called moonlets.[12] The upper limit is also vague. Two orbiting bodies are sometimes described as a double body rather than primary and satellite. Asteroids such as 90 Antiope are considered double asteroids, but they have not forced a clear definition of what constitutes a moon. Some authors consider the Pluto–Charon system to be a double (dwarf) planet. The most common[citation needed] dividing line on what is considered a moon rests upon whether the barycentre is below the surface of the larger body, though this is somewhat arbitrary, because it depends on distance as well as relative mass.
  2. I had one of these https://www.firstlightoptics.com/batteries-powerpacks/skywatcher-powertank-7ah.html did the job well and has other functionality
  3. AP 900 Power Supply

    Out of the two id use that one.
  4. Pixel size question

    the numbers are only one aspect of the choice, FoV, system F-Ratio and effects on usable chip area, prefered Targets, Budget Related filter choice. quiet a bi to weigh up outside the theoretical numbers.
  5. Ideal 300mm Lens for DSO work

    have you looked at medium format lenses?
  6. Stars don't look right. Help

    focus will shift when you change filter, so getting focus with the filter you are going to use to image with is worth it, and that alone could solve the issue.
  7. Atik 383L with 1.25" filters ok???

    It will, The QSI version is better still as the inbuilt filterwheel is closer the the chip reducing the vignette obviously this increases the price. worth also looking at the Moravian one too
  8. always shoot unde ther maximum by a long way, atmosphere plays a huge part in getting a good image then the price of the eyepeice.
  9. If we work out the elements that our solar sytem is made from can we work out what type of star it was that provided the ingredients for it?
  10. very usefull for unatneded use. I use to have one, but an expensive option. Once you find the right values for your system it can be set ino your routines.
  11. Active USB cables

    Yes, No , Maybe not all leads are equal, work for some and not others. Some devices are ok others not, some ports work ok others dont. its very hit and miss in my experiance.
  12. Climate Change

    Solar Activity will have an impact on the ammount of energy it sends our way in all it various forms and this will have effects on Climate quiet likly over very long periods of time, with oddities here and there, Volcanic activty wiill see larger short term impacts.
  13. using a barlow to get effectivly 4.5mm is going to cause problems especially at f5 unless you have top quality eypieces and barlows.