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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, 2023-03-09 (click on the image to get a full resolution photo in a new window)

Date :	2024-04-07
Time (UT) :	22:28 to 23:51

Exp. time :	60x60 seconds, iso1600, dithering mode
Image process tool :	Siril, Gimp, Irfanview
Processing :	dark and flat calibrated
Weather :	clear sky, Moon, temperature of +9o C

Comment :

Went back to shorter focal length and a wider view.

M92, 2024-02-17 (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

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

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 (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

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

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 (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

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

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, 2020-03-13 (click on the image to get a full resolution photo in a new window)

Date :	2020-03-13
Time (UT) :	21:49 to 00:27

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

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, 2019-03-29

Date :	2019-03-29
Time (UT) :	21:55 to 23:43

Exp. time :	70x60 seconds, iso1600, dithering mode
Image process tool :	AstroImageJ, Fitswork, Irfanview
Processing :	Flat calibrate, level, crop 1:1 800x800 center.
Weather :	clear

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

Date :	2019-02-04
Time (UT) :	00:32 to 01:49

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

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, 02-25, 03-11, earlier setup (click on the image to get a full resolution photo in a new window)

Date :	2016-02-23, 02-25, 03-11
Time (UT) :	-

Exp. time :	105x60 + 57x120 seconds, iso800, dithering mode
Image process tool :	DSS, Fitswork, Irfanview
Processing :	resize, level, cal dark&bias
Weather :	clear

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".

M92, 2015-03-22, earlier setup

Date :	2015-03-22
Time (UT) :	23:00 to 00:14

Exp. time :	60x60 seconds, iso800, dithering mode
Image process tool :	Fitswork, Irfanview
Processing :	resize, level, cal dark & bias
Weather :	clear

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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