Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Could be a treat in store in the Sky June 11th-13th

Options
  • 09-06-2010 2:00am
    #1
    Closed Accounts Posts: 3,817 ✭✭✭


    even if it is a disappointment there is a very good explanation as to how Celestial objects are measured by magnitude,for people who did not understand it before now, Like erm Me for instance:o:o:o


    New Space Eye-Candy To Appear In Skies In Mid-June
    comet-mcnaught-hammerfest-norway-jan-6-2007-lg.jpg
    The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.by Staff Writers
    Washington (RIA Novosti) Jun 09, 2010
    The C/2009 R1 comet is nearing the Earth and will be visible in the Northern hemisphere with a naked eye in mid-June, NASA said on its website. The comet, discovered in 2009 by well-known British-Australian astronomer and "comet-catcher" Robert H. McNaught, is already visible through powerful binoculars in the morning sky.

    NASA said the will reach its closest proximity to the Earth by June 15 and could shine just above the horizon in the Perseus constellation. It could be brighter than Venus and visible during the day.
    The comet's green plasma head, or coma, is larger than the planet Jupiter, while the long willowy ion tail stretches more than a million kilometers through space.
    Russian Leonid Yelenin from the Keldysh Institute of Applied Mechanics said on Tuesday the comet would be clearly visible in Russia.
    "It will be visible in the morning and will present a good object for observation, although its beautiful tail is unlikely to be discernable," Yelenin said.
    He said the brightness of the comet could vary as it nears the Sun and could either fade quickly or suddenly increase its magnitude.
    "Different models estimate its brightness at magnitude three or even one," he said.
    The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere.
    The brighter the object appears, the lower the value of its magnitude. Very bright objects have negative magnitudes.
    Sirius, the brightest star of the celestial sphere, has an apparent magnitude of -1.4, while the stars of the Big Dipper are magnitude two.
    Yelenin said C/2009 R1 will be 170 million kilometers from the Earth on June 15 and will pass the Sun at its closest proximity of 60.5 million kilometers on July 2. The best time to spot the is June 11-13, when the new lunar cycle will provide a particularly dark night time sky.


Comments

  • Registered Users Posts: 1,351 ✭✭✭djhaxman


    Time to fire up the old telescope again then so.


Advertisement