Jump to content



  • Posts

  • Joined

  • Last visited

Everything posted by Starfleet

  1. In my mate’s back yard that goes out into an open field there is a 60 watt bulb fitted on a lamp post about 500 metres from his house. At night I could’ve sworn it looks as bright as any bright star in the sky. Now in this scale of some really bright astro objects, I’m thinking where that light must fit in brightness: App. Mag. Celestial object ?26.73 Sun (449,000 times brighter than full moon) ?20 Sun (As seen from Neptune) ?12.6 Full Moon ?8.0 Maximum brightness of an Iridium (satellite) flare ?6.5 Ahad's constant[4] ?6.0 The Crab Supernova (SN 1054) of AD 1054 (6500 light years away) ?4.7 Maximum brightness of Venus and the International Space Station (when the ISS is at its perigee and fully lit by the sun)[5] ?3.9 Faintest objects observable during the day with naked eye ?3.7 Minimum brightness of Venus ?3.0 Maximum brightness of Mars ?2.8 Maximum brightness of Jupiter ?1.9 Maximum brightness of Mercury ?1.47 Brightest star (except for the sun) at visible wavelengths: Sirius ?0.7 Second-brightest star: Canopus ?0.24 Maximum brightness of Saturn 0 The zero point by definition: This used to be Vega (see references for modern zero point) 3 Faintest stars visible in an urban neighborhood with naked eye (List from wikipedia) Would it be poss to work out this in magnitude? I read in some physics thesis you have the inverse square law but that’s for the stars (not for light bulbs). So can I predict what brightness a lamp would be seen from say 500 metres? [/]
  2. my network outtage delayed me, but thanks for the greetings :sunny: Cool to know so many people still 'look' at stars and not try to take piccies of them. I'm quite old fashioned actually, if i could bear the frosty nights now upon us I'd sit out in the yard with a pencil and draw the smudgy nebulae as much as my eyes will see. I also would like to discover something. ha ha wouldn't we all. I still think there are faint stars that may be variable and not all of them have been charted in the sky. Has anyone here looked into such things?
  3. I have only some interest in observational astronomy, so I may not be so dedicated as many of you professional astrophotographers here. I do read a lot on the theoretical sides of astronomy, so you may call me a 'cloudy nights' astronomist . I like to share in the passion of all things astronomy, as i love the hobby and I like to learn more through discussions. So here I am
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.