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Astronomy Science Data, POSS-II
M13, Hercules Globular Cluster

POSS-II: M13 Hercules Globular Cluster
Coordinates/Direction : RA: 16h41m, DEC: +36o27'
Object size : 20' (whole image 60' x 60')
Object magnitude : 5.8
Object : Messier 13
Date : 1985 to 2000
Lens/telescope : Samuel Oschin Telescope
Film/CCD : POSS-II, credits: STScI
Exp. time : IR 110 minutes, Red 115 minutes, Blue 55 minutes
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Green channel from average of red and blue
Site : Mount Palomar, USA
Comment : Compare what you get from your own telescope, the core of cluster oversaturated.
More to know : Wikipedia: wiki/ Messier 13

Zoom in details:

POSS-II: M13 Hercules Globular Cluster
Zoom in details : 1:1 pixel scale
Comment : As you can see if you compare to the earlier POSS-I data this one has much higher resolution. The scanner resolution is the same in the blue plates.

Use of the IR spectra as the green output channel:

POSS-II: M13 Hercules Globular Cluster
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : In this image the IR spectra has been used to the green output channel
Comment : One star is very green below the cluster. Green is where we have the IR radiation in this false color image, it must have a strong IR radiation. This star isn't in my star chart. Update: I got the advise to use the Aladin Star Atlas. It shows that this star is the TYC 2588-692-1.

The cluster is purple because we missing a real green channel. These star has more continuous rgb spectra with very little IR in it, they are old stars and hot blue.
More to know : Star TYC 2588-692-1:
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