Globular cluster M13 captured using Canon EOS 600D + EF-S F/4-5.6 55-250mm @250mm and F/7. The camera was put on EQ5 motorized mount.
The cluster's diameter is about 145 light years; it is composed of about half million stars and is distanced more than 25000 light years from Earth (according to Wikipedia).
Here is annotated image created with nova.astrometry.net. Image size is 1.04 x 1.04 degree.
Cluster's location (by nova.astrometry.net):
Technical details
Three sets of frames (captured during three nights) were combined together: 11x60s; 31x30s; 11x30s. These framesets were calibrated independently using IRIS then aligned and stacked (using average method) also by IRIS. A primary background subtraction and color balance were made by IRIS too. Resulted FITS image were processed by FITStacker (gamma correction and additional background subtraction). Then the result (PNG file) was treated with RawTherapee (color balance, level correction etc). A shape of stars, which were slightly distorted due to tracking errors and lens distortion were corrected by FITSwork. Finally, GIMP was used to remove a couple of hot pixels (there was a calibration problem with the second series of frames).
The cluster's diameter is about 145 light years; it is composed of about half million stars and is distanced more than 25000 light years from Earth (according to Wikipedia).
Here is annotated image created with nova.astrometry.net. Image size is 1.04 x 1.04 degree.
Cluster's location (by nova.astrometry.net):
Technical details
Three sets of frames (captured during three nights) were combined together: 11x60s; 31x30s; 11x30s. These framesets were calibrated independently using IRIS then aligned and stacked (using average method) also by IRIS. A primary background subtraction and color balance were made by IRIS too. Resulted FITS image were processed by FITStacker (gamma correction and additional background subtraction). Then the result (PNG file) was treated with RawTherapee (color balance, level correction etc). A shape of stars, which were slightly distorted due to tracking errors and lens distortion were corrected by FITSwork. Finally, GIMP was used to remove a couple of hot pixels (there was a calibration problem with the second series of frames).
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