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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, 2024-02-17

M92 globular cluster, 2024 (click on the image to get a full resolution photo in a new window)
Date : 2024-02-17
Time (UT) : 23:47 to 00:56
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : ASI120 camera with 400 mm f/6.3 lens
Lens/telescope : TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow : 3" field flatter, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system: Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)
Exp. time : 30x120 seconds = 1 hour, iso1600, dithering mode
Image process tool : Siril, Gimp, Irfanview
Processing : bias, flat and color calibrated against star spectra with tweaking of the green channel afterwards
Weather : clear sky, no Moon, temperature -1o C
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
Comment : I have a lot of photos of this open cluster. But it's much more interesting when I use my big refractor and can see more of the details of it.

M92, 2024-02-06

M92 globular cluster, 2024 (click on the image to get a full resolution photo in a new window)
Date : 2024-02-06
Time (UT) : 00:35 to 02:59
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : ASI120 camera with 400 mm f/6.3 lens
Lens/telescope : TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow : 3" field flatter, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system: Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)
Exp. time : 49x120 seconds = 1 hour 38 minutes, iso1600, dithering mode
Image process tool : Siril, Gimp, Irfanview
Processing : bias, flat and color calibrated against star spectra with tweaking of the green channel afterwards
Weather : clear sky, no Moon, temperature -4o C
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
Comment : First visit to M92 cluster with this telescope after upgrade, way better now. Overexposed in center of cluster, 60 second had been better.

M92, 2023-03-09

M92 globular cluster, Mars 9, 2023 (click on the image to get a full resolution photo in a new window)
Date : 2023-03-09
Time (UT) : 00:15 to 01:04
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with 200 mm f/3.5 lens
Lens/telescope : Pentax 645 300 mm ED f/4 (medium format lens)
Corrector/Barlow : -
Field (FOV) : 6.8x4.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system: Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)
Exp. time : 60x60 seconds, iso1600, dithering mode
Image process tool : Siril, Gimp, Irfanview
Processing :  dark and flat calibrated
Weather : clear sky and a temperature of -6o C
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
Comment : This is one photography I took to show all of you that don't have a telescope. A normal telephoto lens of high quality can do a lot even at small objects. This global cluster has half the angle size of the Moon's diameter. Click on the image and zoom in to see all the details. It was discovered already 1777 by Johann Elert Bode. The distance to it is 27'000 light years. Its light is then 27'000 years old when it hit us. The cluster's mass is equal to 330'000 Suns.

M92, 2023-03-09, crop 1:1

M92 globular cluster crop around center, Mars 9, 2023
Date : 2023-03-09
Time (UT) : 00:15 to 01:04
Comment : It's small of course compare to the telescope photo below, but it's there.

M92, 2020-03-13

M92 globular cluster, Mars 13, 2020
Date : 2020-03-13
Time (UT) : 21:49 to 00:27
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with 400 mm f/6.3 lens
Lens/telescope : TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow : 3" field flatter, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC
Exp. time : 106x60 seconds, iso1600, because of clouds I had to reject about ten images
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Bias and dark handled with dithering, Synthetic flat calibrate, level.
Weather : clear
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
Comment : One more image of the globular cluster M92. I want to see how my equipment perform after I hade rebuilt the mount, make a new routine for flat calibration and cleaned the sensors once again. Now I see that the image is almost free from dust and stains, only one big blob left. Normally I have to run filter to get rid of them, I didn't do that this time. Good because a filter have some disadvantages on the object. I let the background be much darker this time, but not totally black.

M92, 2020-03-13, crop 1:1

M92 globular cluster crop around center, Mars 13, 2020
Date : 2020-03-13
Comment : And in this close up I see that the core of the globular cluster is not oversaturated.

M92, 2019-03-29

M92 globular cluster crop around center, Mars 29, 2019
Date : 2019-03-29
Time (UT) : 21:55 to 23:43
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with 400 mm f/6.3 lens
Lens/telescope : TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow : 3" field flatter, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC
Exp. time : 70x60 seconds, iso1600, dithering mode
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : Flat calibrate, level, crop 1:1 800x800 center.
Weather : clear
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
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 : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with 400 mm f/6.3 lens
Lens/telescope : TS130 APO f/7 910mm, 3" focuser
Corrector/Barlow : 3" field flatter, x1. T48 connector to camera
Field (FOV) : 2.25 x 1.5o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC
Exp. time : 82x30 seconds, iso1600, dithering mode
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. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
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 : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with off-axis
Lens/telescope : TS130 APO f/7 910mm (682mm, f/5.2), 3" focuser
Corrector/Barlow : Riccardi 2.5" field flatter, x0.75. T48 connector to camera
Field (FOV) : 3.0 x 2.0o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC
Exp. time : 105x60 + 57x120 seconds, iso800, dithering mode
Image process tool : DSS, Fitswork, Irfanview
Processing : resize, level, cal dark&bias
Weather : clear
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
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 : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Guide : QHY5 camera with off-axis
Lens/telescope : TS130 APO f/7 910mm (682mm, f/5.2), 3" focuser
Corrector/Barlow : Riccardi 2.5" field flatter, x0.75. T48 connector to camera
Field (FOV) : 3.0 x 2.0o (full frame) before crop
camera : Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature: About 6o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, guide by PHD2, focuser by USB-focus, ASCOM Windows PC
Exp. time : 60x60 seconds, iso800, dithering mode
Image process tool : Fitswork, Irfanview
Processing : resize, level, cal dark & bias
Weather : clear
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o-90o, 165o-185o, La: 20o-55o
Comment : M92 together with M3 and M13 are relative easy objects to catch on photo, no need of very long exposure time.
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