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M13
M13, At its distance of 25,100 light years, its angular diameter of 20' corresponds to a linear 145 light years - visually, it is perhaps 13' large. It contains several 100,000 stars; Timothy Ferris in his book Galaxies even says "more than a million". Towards its center, stars are about 500 times more concentrated than in the solar neighborhood. The age of M13 has been determined by Sandage as 24 billion years and by Arp as 17 billion years around 1960; Arp later (in 1962) revised his value to 14 billion years (taken from Kenneth Glyn Jones).
Link-words: Messier Galaxy

M13

M13, At its distance of 25,100 light years, its angular diameter of 20' corresponds to a linear 145 light years - visually, it is perhaps 13' large. It contains several 100,000 stars; Timothy Ferris in his book Galaxies even says "more than a million". Towards its center, stars are about 500 times more concentrated than in the solar neighborhood. The age of M13 has been determined by Sandage as 24 billion years and by Arp as 17 billion years around 1960; Arp later (in 1962) revised his value to 14 billion years (taken from Kenneth Glyn Jones).

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File information
Filename:CS_M13-5-20050421.jpg
Album name:CSuddell / Messier Objects
Rating (2 votes):22222
Link-words:Messier / Galaxy
Image date, time and location:21st April 2005
Telescope aperture and focal ratio:Meade LX90 @ F3.3 SAC8, 38 x 5 Second Images stacked using AIP for WIN.
Filesize:31 KiB
Date added:May 07, 2005
Dimensions:550 x 408 pixels
Displayed:292 times
URL:http://gallery.orpington-astronomy.org.uk/displayimage-155-_M13_.html
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