Astrofriend's homepage

www.astrofriend.eu
Share: Twitter Reddit Facebook Gmail Gmail Email
Search Astrofriend's homepage:

Valid CSS!

All pages shall now have been validated

Info Cookies (Kakor) / GDPR

Navigation

Advertisement /
Annons:

Space News

Advertisement / Annons:

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, 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 controlled by EQMOD and KStars Ekos/Indi
Guide : Ekos internal guider in dithering mode, QHY5 camera with 200 mm f/3.5 lens
Lens/telescope : Pentax 645 300 mm ED f/4, external focus motor, Pentax 645 project page
Corrector/Barlow : -
Field (FOV) : 6.8x4.5 degree, before cropping
Filter : none
camera : Canon 6D, temperature +2 C. Controlled by KStars Ekos/Indi
Film/CCD : Raw
Exp. time : 60x60 seconds, iso1600
Image process tool : Siril, Gimp, Irfanview
Processing :  dark and flat calibrated
Weather : clear sky and a temperature of -6 C
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
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 : 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
Field (FOV) : 2.25x1.5 degree, before cropping
Filter : none
camera : Canon 6D, controlled by APT software
Film/CCD : Raw
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 class 9
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 : 2019-02-29
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
Field (FOV) : 2.25x1.5 degree, before cropping
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. Bortle class 9
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
Field (FOV) : 2.25x1.5 degree, before cropping
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. Bortle class 9
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
Field (FOV) : 3x2 degree, before cropping
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. Bortle class 9
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, f/5.3)
Corrector/Barlow : Riccardi flat field corrector 2.5" x0.75
Field (FOV) : 3x2 degree, before cropping
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. Bortle class 9
Comment : M92 together with M3 and M13 are relative easy objects to catch on photo, no need of very long exposure time.
Go Back to content

Go Back

Advertisement / Annons: