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چگونگی رصد کردن غول منظومه ی شمسی!
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[تصویر:  13599746721.jpg]



NASA's Cassini mission to Saturn flew past Jupiter in 2000,
capturing the shadow of Europa in the gas giant's atmosphere.




NASA





Over the last few weeks, sky watchers have been treated to some truly
spectacular views of the moon silently drifting past the mighty planet
Jupiter.

The sad thing is that many people noticed "that bright star
near the moon" but only a few recognized it as the largest planet in the
solar system. On learning the true nature of this "star" many were
surprised that it was so bright and easy to see with the naked eye.

PICTURES: Ten Cosmic Stunners to Point Your New Telescope At


Jupiter holds many more surprises for those with a telescope,
but you don't even need any specialized astronomical equipment to reveal
its secrets -- even a bird watching telescope will produce better views
than what Galileo could attain over 400 years ago.

With a little practice, try keeping an eye on the Jovian moons
-- they move quite fast and even over a period of just an hour or two
it's possible to see their positions drift. During very special
occasions you can spot the moons pass directly in front of the planet
and see their shadow fall on the gas giant. You may even see them
disappear behind the planet.

The secret to getting a good view of Jupiter is to use a
magnification of at least 50x. That puts detailed views of the planet
out of reach of most binoculars, but a good pair of 7x50's can at least
reveal the four larger Galilean moons: Io, Europa, Ganymede and
Callisto. Higher magnifications of 50x and beyond will reveal detail
in the top of the planet's atmosphere such as the cloud belts and the
famous Great Red Spot.

PICTURES: The Moons Of Jupiter


Jupiter is a gas giant made from different chemicals that
slowly change to liquid toward the core. Anyone looking for the first
time will notice bands running across the disk; the darker ones known as
'belts' where material is descending, the lighter ones are 'zones'
where ammonia clouds are brought up to the top of the atmosphere and the
dark lines between the two are known as 'bands.'

High velocity winds known as jet streams form the belts and
blow in opposite directions between the belts and zones. One of the most
famous of Jupiter's features is the Great Red Spot which is a hurricane
larger than Earth and can be found in the Southern Equatorial Belt.

The appearance of these features through a telescope can be
quite subtle, but it is possible to enhance them with the use of color
filters attached to the eyepiece. The filters screw in to the
'telescope' end of the eyepiece before its placed into the eyepiece
holder and come in a range of colors. Different colours will enhance
different details but, in my experience, a light blue filter such as the
Lumicon #82A brings out the contrast and enhances the general view of
the planet nicely.

Jupiter really does have something for everyone, whether you
are watching it slowly march across the sky night after night and slowly
change brightness, or trying to chase its moons with binoculars.
Maybe you are a telescope owner studying the atmosphere in fine detail,
but however you decide to study the planet it won't ever let you down.
There are always some Jovian surprises in store.


در مورد اظهار نظر آقایون در تاپیک دلخوری باید بگم:
آقایون: کم گوی و گزیده گوی چون در// تا ز اندک تو جهان شود پر!!!
هرچند ک کلام گوهر بار از زبان شما جاری نشده، نمیشود و نخواهد شد!!!
پاسخ
 سپاس شده توسط Hamid Jafary Pooya ، mr.allahbeigi


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  منظومه ی شمسی دیگر در نزدیکی ما !!! amir astronomer 0 173 01-02-2013، 11:52 AM
آخرین ارسال: amir astronomer

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