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Author Topic: What is the closest star not visible to the naked eye?  (Read 3291 times)

Offline AllenG

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I think Hipparcos 5926 (V762) in Cassiopeia, 16,308 light-years away and magnitude 5.84 is the farthest star visible to the naked eye.
What is the closest star (which would have a very low magnitude) not visible to the naked eye?

Thanks,

--Allen
« Last Edit: 22/11/2008 03:15:21 by AllenG »


 

Offline RD

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What is the closest star not visible to the naked eye?
« Reply #1 on: 22/11/2008 04:32:38 »
Quote
Proxima Centauri (Latin proxima: meaning 'next to' or 'nearest to') is a red dwarf star approximately 4.2 light-years distant in the constellation of Centaurus. It was discovered in 1915 by Robert Innes, the Director of the Union Observatory in South Africa. The star may be part of the Alpha Centauri system, and it is the nearest star to the Sun ... Red dwarfs such as Proxima Centauri are far too faint to be seen with the naked eye... It has an apparent visual magnitude of 11 [actually variable 13-11], so a telescope with an aperture of at least 8 cm (3.1 in.) is needed to observe this star even under ideal viewing conditions—under clear, dark skies with Proxima Centauri well above the horizon.
http://en.wikipedia.org/wiki/Proxima_Centauri
« Last Edit: 22/11/2008 04:37:45 by RD »
 

Offline AllenG

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What is the closest star not visible to the naked eye?
« Reply #2 on: 22/11/2008 04:36:55 »
Thanks RD.

I forgot that Alpha Centauri was a multiple star.
 

lyner

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What is the closest star not visible to the naked eye?
« Reply #3 on: 22/11/2008 16:57:50 »
Quote
What is the closest star (which would have a very low magnitude)
Distance and magnitude are not automatically related. A black sheet of paper would have a very high magnitude, a supernova at great distance would have very low magnitude.
Bright = Low magnitude
Dim = High magnitude
(Very bright can be negative magnitude; it's a logarithmic scale)

Relative magnitude = what you see
Absoulte magnitude = magnitude of star if it were 10 parsec away.
 

Offline dentstudent

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What is the closest star not visible to the naked eye?
« Reply #4 on: 24/11/2008 08:23:41 »
The sun at night......
 

lyner

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What is the closest star not visible to the naked eye?
« Reply #5 on: 24/11/2008 09:17:44 »
Daily eclipse?
 

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What is the closest star not visible to the naked eye?
« Reply #5 on: 24/11/2008 09:17:44 »

 

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