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Go Back   Armchair General and HistoryNet >> The Best Forums in History > Military/History Related Hobbies > Research, Reference and Historical Study > Science

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  #61  
Old 17 Oct 09, 09:37
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Variable star V838 Monocerotis lies near the edge of our Milky Way Galaxy, about 20,000 light-years from the Sun. Still, ever since a sudden outburst was detected in January 2002, this enigmatic star has taken the center of an astronomical stage while researchers try to understand where it fits into the picture of stellar evolution. As light from the stellar flash echoes across pre-existing dust shells around V838 Mon, its appearance changes dramatically. Revealed in a sharp snapshot recorded in February by the Hubble's Advanced Camera for Surveys, this portion of the dust shell is about six light-years in diameter. But because light reflected from the dust follows only a slightly indirect path compared to the direct line-of-sight to the star, the light echoes visible now are only lagging about two years behind the outburst itself. Astronomers expect the expanding echoes to continue to light up the dusty environs of V838 Mon for at least the rest of the current decade.

http://apod.nasa.gov/apod/ap040305.html
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  #62  
Old 18 Oct 09, 15:57
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  #63  
Old 19 Oct 09, 13:01
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  #64  
Old 20 Oct 09, 12:43
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  #65  
Old 21 Oct 09, 11:43
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Nice picts, If you got a few billion to spent on a space telescope.
What pisses me off is when they put them on $200 telescope
boxes, and talk about getting 525X out of a 60mm* refractor.
and people expect to see stuff like that.

I got a 16" newtonian and 640x is pushing it's limits hard. Weather permitting, with perfect seeing and 7 mag. skies. Even then you won't see views like that, amateurs can do pretty good using a tracking telescope and long period camera exposures along with software stacking of images.

Just though i'd comment so if anyone is tempted to start doin' some
star observing, go out and look though a few scopes at a local star party before you buy. Not only will you find out what not to buy, but you'll find
out what you can really see for yourself.

* rule of thumb is about 40x per inch IMHO, some say as high as
50x some 25x per inch. Regardless 60mm is about 100x at best
considering the "fine" optics
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  #66  
Old 21 Oct 09, 13:10
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  #67  
Old 21 Oct 09, 17:13
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What kind of magnification is that Martian photo?

I have never seen anything like it.
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Old 21 Oct 09, 17:17
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  #69  
Old 22 Oct 09, 14:00
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Quote:
Originally Posted by Bugreport View Post
Nice picts, If you got a few billion to spent on a space telescope.
What pisses me off is when they put them on $200 telescope
boxes, and talk about getting 525X out of a 60mm* refractor.
and people expect to see stuff like that.

I got a 16" newtonian and 640x is pushing it's limits hard. Weather permitting, with perfect seeing and 7 mag. skies. Even then you won't see views like that, amateurs can do pretty good using a tracking telescope and long period camera exposures along with software stacking of images.

Just though i'd comment so if anyone is tempted to start doin' some
star observing, go out and look though a few scopes at a local star party before you buy. Not only will you find out what not to buy, but you'll find
out what you can really see for yourself.

* rule of thumb is about 40x per inch IMHO, some say as high as
50x some 25x per inch. Regardless 60mm is about 100x at best
considering the "fine" optics
The earthbound observatories have the advantage of vastly superior optics, locales outside of light pollution, and as much above atmospheric disturbance as possible, while Hubble has the ultimate advantages.

Good tips of what to think about when considering telescopes, Bugs. Thanks.
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  #70  
Old 25 Oct 09, 18:47
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The Crab Nebula Imaged By Hubble

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  #71  
Old 27 Oct 09, 14:05
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Old 30 Oct 09, 13:12
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Old 03 Nov 09, 12:26
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  #74  
Old 04 Nov 09, 13:04
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  #75  
Old 04 Nov 09, 15:22
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Is that some kind of filtered shot of our sun?

Neat pic.
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