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Calculon

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About Calculon

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    Nebula

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    West Lothian, United Kingdom
  1. On the one hand it's not a completely terrible idea, on the other hand it's a surefire way to make the neighbours think you're a total loon!
  2. Now this is interesting, and could certainly explain things! https://en.wikipedia.org/wiki/Electrophonic_hearing#Meteors The second citation is attributed to NASA, for those who are immediately cynical of Wiki links edit: Didn't see GH's most recent reply before adding this post. I believe this is the indirect sound effect he is referring to.
  3. Is it not possible there was a coincident firework off in a different direction? I've heard plenty this year that make the noise you're describing, and as others have reasoned it would be extremely surprising to have actually heard a meteor.
  4. No it does not. Quite how you would manage to get the Earth to instantly vanish is another matter!
  5. Thanks Andy. Interesting point regarding IR, I understand this would affect any imaging attempts but how bad would it be to not block the IR properly?
  6. This is interesting and news to me - do you have a source of reference for this I could look at?
  7. Hi all, Recently purchased an OIII filter but skies are sadly far too cloudy to get any use out of it! In the meantime I was wondering about the difference between 'visual' and 'imaging' filters. Are imaging/CCD filters more narrowband than visual filters? If not, what is the difference in terms of specifications? Could one feasibly use 'visual' filters for astrophotography? Cheers! Cal
  8. Think you might have Jupiter and Saturn the wrong way around! Nebula hunting can vary wildly by time, for example if this was a moonless winter night you'd be able to pick out M42 by eye in darkish skies. Much easier than picking nebulae out tonight, though at least you won't be nearly as cold!
  9. Leaving aside the formatting and dramatic italics I'm not sure I buy this at all. For starters he has issues with the correlation of absolute magnitude and distance from the solar system - surely this is a selection effect? At larger distances you don't see the fainter stars, and at closer distances we have a much smaller sample of stars from which to drawn on, so it isn't immediately surprising that we happen to live near predominantly faint stars - would he be happier if we (purely by coincidence) happened to live near a particularly bright star? I feel it would also aid the author greatly if he were to actually develop his contentions rather than to simply assert that "this cannot be"!
  10. Woohoo! One of the reasons I got into astronomy, good job on the capture.
  11. This is ridiculously underappreciated by far too many people. It's incredible that it's become such a prevalent idea that people hold the 'great' holidays against teachers, when the reality is that they end up with less time separated from work than most standard workers. Anyway, OP, it's tough to say whether or not you should take the offer. If the pay isn't good then you really need to figure out how much you'll enjoy the job, there's no substitute for being happy in what you do! Inevitably it's a very personal decision that only you can weigh up properly.
  12. The different eyepieces will change the magnification (i.e. apparent size of the viewed object) and the field of view, not what kind of things you can see, which is mostly determined by your telescope aperture. Given their size and relative faintness you'll likely have more success using the 25mm eyepiece to find DSOs and then switching to the 10mm if you feel you'd benefit from the greater magnification. Familiarising yourself with the concept of averted vision will also aid you greatly in spotting fainter objects. For this time of year the Great Cluster in Hercules is a fairly simple target as it's so bright. You'll immediately know you've found it when you see a large diffuse object which is very much unlike nearby point stars.
  13. Inflation. Universe expands at a ridiculous rate in its early stages, leading to parts of the universe which we cannot (currently) observe.
  14. My 10" dob gives fantastic views of the moon, if anything it's so bright it can easily ruin my dark adaptation! Easy to take low magnification handheld camera shots so I don't see any reason why you'd struggle with a DSLR.
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