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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 2021-03-18

Globular cluster M13, Mars 18, 2021 (click on the image to get a full resolution photo in a new window)
Date : 2021-03-18
Time (UT) : 21:45 to 23:59
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode, Guide telescope 200 mm f/3.5, camera QHY5
Lens/telescope : Pentax 645 ED medium format, 300mm f/4
Corrector/Barlow : -
Filter : none
camera : Canon 6D, controlled by APT software
Film/CCD : Raw
Exp. time : 27x30 seconds, 58x60 seconds, ISO1600
Image process tool : AstroImageJ, Fitswork, IrfanView
Processing : demosaic, synthetic flat calibrated, hot pixel removed by dithering, level
Weather : clear sky
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : Things start to work now with my new used Pentax medium format lens. Motor focus excellent, auto focus some times.

Problems left to solved, there is some tilt of the sensor because of the adapter doesn't fit very well, project Pentax 645 300mm. When this problem is solved I have a very high performance lens that have low vignetting even at full frame.

M13 2021-03-18, zoom in

Globular cluster M13, Mars 18, 2021
Date : 2021-03-18
Image process tool : AstroImageJ, Fitswork, IrfanView
Processing : demosaic, synthetic flat calibrated, hot pixel removed by dithering, level, crop
Comment : Zoom in to the core of M13, 1:1 pixel relation.

M13 2020-03-12

Globular cluster M13, Mars 12, 2020 (click on the image to get a full resolution photo in a new window)
Date : 2020-03-12
Time (UT) : 22:29 to 00:45
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 APT software
Film/CCD : Raw
Exp. time : 93x60 seconds, ISO1600
Image process tool : AstroImageJ, Fitswork, IrfanView
Processing : demosaic, synthetic flat calibrated, hot pixel removed by dithering, level
Weather : clear with drifting clouds
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : Now in Mars I have the globular cluster M13 in Eastern direction, we had a clear sky this night and I started up the telescope. I got a total exposure of 93 minutes, the images in the middle are a bit of focus.

This time I flat calibrated the image with the new tool Flatfield. It make a synthetic flat frame adapted mathematically to the optics vignetting. No problem with old flat frames that are not updated to a cleaned sensor, and no problem with reflections in the telescope that destroy the flat frame. Compare with the photos below.

Stains and dust on the sensor is a big problem, you can see here: 'cleaning sensor' how I fight it (only Swedish).

M13 2020-03-12, zoom in

Globular cluster M13, Mars 12, 2020
Date : 2020-03-12
Image process tool : AstroImageJ, Fitswork, IrfanView
Processing : demosaic, synthetic flat calibrated, hot pixel removed by dithering, level, crop
Comment : Zoom in to the core of M13, 1:1 pixel relation.

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 APT 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. Bortle class 9
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 f/2.8 (set to f/4.0)
Corrector/Barlow : -
Filter : none
camera : Canon 6D, controlled by intervallo 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. Bortle class 4
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 f/7 (682mm, f/5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Filter : none
camera : Canon 6D, controlled by APT software
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, Hagsätra. Bortle class 9
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 f/7 (682mm, f/5.3)
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, Hagsätra. Bortle class 9
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, Hagsätra. Bortle class 9
Comment : An easy shot even under my light polluted area.
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