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Globular Cluster
Messier 92


Object : M92, Globular Cluster.
Coordinates/Direction : RA: 17h17m, DEC: +43o08'
Object size : 14'
Object magnitude : 6.3
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Messier 92

M92, 2019-03-29

M92 globular cluster crop around center, Mars 29, 2019
Date : 2019-02-29
Time (UT) : 21:55 to 23:43
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode, QHY5 camera, 400 mm f/6.3 guide telescope
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Flat field corrector 3" x1
Filter : none
camera : Canon 6D, controlled by APT
Film/CCD : Raw
Exp. time : 70x60 seconds, iso1600
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Flat calibrate, level, crop 1:1 800x800 center.
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : A second chance to catch the globular cluster M92. Good target to test the equipment at. Still the focusing that I need more control over. I try to optimize the temperature compensation of focus, not easy and a slow process.

M92, 2019-02-04, earlier attempt

M92 globular cluster crop around center, February 3, 2019
Date : 2019-02-04
Time (UT) : 00:32 to 01:49
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode, QHY5 camera, 400 mm f/6.3 guide telescope
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Flat field corrector 3" x1
Filter : none
camera : Canon 6D, controlled by APT
Film/CCD : Raw
Exp. time : 82x30 seconds, iso1600
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Flat calibrate, medium stack, level, crop 1:1 800x800 center. 0.6 Mpix of 5Mpix.
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : It was three years since last time I took a photo of the globular cluster M92. Now I have a new setup with longer focal length and less vignetting. This time I only show the small center of the image. It is cropped with 1:2 pixel. Is it possible to see any better resolution compare to earlier photo? I haven't done anything to take away dust blobs this time. I have increased the ISO to 1600 and shorter exposure time.

The focal length is increased from 684 mm to 910 mm, gives better resolution but longer exposure times.

M92, 2016-02-23, earlier setup

M92 globular cluster 2016
Date : 2016-02-23, 02-25, 03-11
Time (UT) : -
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode, QHY5 camera, off-axis
Lens/telescope : TS130, 910mm f/7 (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 : 105x60 + 57x120 seconds, iso800
Image process tool : DSS, Fitswork, Irfanview
Processing : resize, level, cal dark&bias
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : M92, a complement with 120 seconds exposures and stacked together with the older 60 seconds exposures. The auto guiding was a little bit unstable this time. Stars FWHM about 4".

zoom in

M92 globular cluster 2016
Date : 2016-02-23, 02-25, 03-11
Time (UT) : -
Comment : A zoom in on the core.

M92, 2015-03-22, earlier setup

M92 globular cluster 2015
Date : 2015-03-22
Time (UT) : 23:00 to 00:14
Mount : EQ6 controlled by EQMOD
Lens/telescope : TS130, 910mm f/7 (682mm, f5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Filter : none
camera : Canon 5D, controlled by APT
Film/CCD : Raw
Exp. time : 60x60 seconds, iso800
Image process tool : Fitswork, Irfanview
Processing : resize, level, cal dark & bias
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : M92 together with M3 and M13 is relative easy to get on photo, no need of very long exposure time.

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