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Globular Cluster
Messier 13


Object : M13, Globular Cluster
Coordinates/Direction : RA: 16h41m, DEC: +36o27'
Object size : 20'
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Messier 13

M13 2019-03-19

Globular cluster M13, Mars 2019
Date : 2019-03-19
Time (UT) : 22:11 to 23:41
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode, Guide telescope 400 mm f/6.3, camera QHY5
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Flat field corrector 3" x1
Filter : none
camera : Canon 6D, controlled by ATP software
Film/CCD : Raw
Exp. time : 62x60 seconds, ISO1600
Image process tool : AstroImageJ, Fitswork, IrfanView
Processing : demosaic, flat calibrated, hot pixel removed by dithering, level
Weather : clear, Moon
Site : Sweden, Stockholm, Hagsätra
Comment : Globular cluster are one of the few objects that you can catch even if the light pollution is high.

This is the first image of M13 where I have the telescope setup for 910 mm focal length. Compare with the photos below.

M13 2016-09-03, wide field

Globular cluster M13, wide angle 03 september 2016 (click on the image to get a full resolution photo in a new window)
Date : 2016-09-03
Time (UT) : 19:54 to 20:55
Mount : Star Adventurer
Guide : -
Lens/telescope : Sigma APO 150mm f2.8 (set to f4.0)
Corrector/Barlow : -
Filter : none
camera : Canon 6D, controlled by intervalo meter
Film/CCD : Raw
Exp. time : 29x120 seconds, iso400
Image process tool : AstroImageJ, Fitswork
Processing : demosaic, flat, hot pixel removed by dithering, level
Weather : clear
Site : Sweden, Mariestad
Comment : Wide angle version, at this photo M13 looks like a bright star. This photo was taken under the Mariestad Starparty, Under the Stars. We got a very dark night almost free from clouds. It gave me a chance to do more test with different setting. This time I lowered the iso setting to 400 to achieve more dynamic.

The image is processed in the AstroImageJ software which I have developed macros to. It need that I have taken the images with dithering, now I didn't had that possibility with this mount, but polar align was not perfect so I got some kind of dithering, enough to get rid of the hot pixels.

The Sigma 150mm APO 2.8 give me very sharp stars compare to other lenses I have. And it will be better when I have practice the polar align process better.

M13 2016-03-01

M13 globular cluster 2016
Date : 2016-03-01
Time (UT) : 00:44 to 02:02
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera off-axis
Lens/telescope : TS130, 910mm f7 (682mm, f5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Filter : none
camera : Canon 6D, controlled by APT
Film/CCD : Raw
Exp. time : 33x120 seconds, iso800
Image process tool : Fitswork, Irfanview
Processing : crop, level, no cal dark&bias, only dithering, crop
Weather : clear
Site : Sweden, Stockholm
Comment : A new shot on M13, no calibration, only dithering to get rid of hotpixels.

M13 2016-02-24, new camera

M13 globular cluster 2016
Date : 2016-02-24
Time (UT) : 00:12 to 01:34
Mount : EQ6 controlled by EQMOD
Lens/telescope : TS130, 910mm f7 (682mm, f5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Filter : none
camera : Canon 6D
Film/CCD : Raw
Exp. time : 60x60 seconds, iso800
Image process tool : Fitswork, Irfanview
Processing : resize, level, no cal dark&bias, only dithering
Weather : clear, full moon
Site : Sweden, Stockholm
Comment : First shot with my Canon 6D on M13.

M13 zoom in

M13 globular cluster zoom in 2016
Comment : A zoom in to the core of M13, pixel 1:1 relation. In the future I will use the dithering technique as an alternative to dark&bias calibration. It doesn't work perfect today, but I will test out the settings to get it to work better. The sharpness wasn't perfect this time and the full moon also disturb,

2015-03-16, mi first photo of M13

M13 globular cluster 2015
Date : 2015-03-16
Time (UT) : 00:09 to 01:37
Mount : EQ6 controlled by EQMOD
Lens/telescope : TS130, 910mm f7 (682mm, f5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Filter : none
camera : Canon 5D
Film/CCD : Raw
Exp. time : 43x60 seconds, iso800
Image process tool : Fitswork, Irfanview
Processing : resize, level, cal dark&bias
Weather : clear
Site : Sweden, Stockholm
Comment : An easy shot even under my light polluted area.

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