M13 The Hercules Globular Cluster
The count down has begun for the long awaited vacation which will begin for me at 2:30pm Friday afternoon and I am looking forward to it!!!.
I haven’t made any real plans yet but,if the weather cooperates I plan on doing a lot of observing day/night.
On my old blog I have had a few post about the Hercules Cluster but,since I wasn’t able to transfer all of the post from my old blog to here.I guess I will have to start from scratch and post a new image.I am not sure how long I will be staying with wordpress.com because,it is becoming obvious that if I post too many images I will have to start paying for the space and the way I see it is; if I have to pay for the space then I might as well start my very own website with all of the features that I want which includes creating my own theme.OR….just go back to vela.net and deal with errors, which is also a free site and provides all of the space I need ??!.The reason I am questioning wordpress.com IS…while I am writing this post,I am looking at a message stating that I have used 58% of 50 Mb buy more.Hmmmm,seems to me when I exported all 150 post(s)including links,blogroll and comments from vela.net to my Pc, it was only 29 Mb’s?.Even though I am not very computer savvy,I can’t help but to think I smell something fishy?!!!.Any thoughts???.
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).
According to Kenneth Glyn Jones, M13 is peculiar in containing one young blue star, Barnard No. 29, of spectral type B2. The membership of this star was confirmed by radial velocity measurement, and is strange for such an old cluster – apparently it is a captured field star.
Below is another image I shot a couple months ago.I cropped and enhanced it just a bit.Skies were clear and the transparency was good.Haven’t seen those kind of skies since!!.
Image credit: Andrew