Astrofriend's homepage

Advertisement / Annons:

Valid CSS!

All pages shall now have been validated

Info Cookies (Kakor) / GDPR

Navigation

Advertisement /
Annons:

Space News

Globular Cluster
Messier 92


M92 globular cluster crop around center, 2019
Coordinates/Direction : RA: 17h17m, DEC: +43o08'
Object size : 14'
Object magnitude : 6.3
Object : M92
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, Drizzle Á 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.

M92, earlier setup

M92 globular cluster 2016
Coordinates/Direction : RA: 17h17m, DEC: +43o08'
Object size : 14'
Object magnitude : 6.3
Object : M92
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
Object : M92
Date : 2016-02-23, 02-25, 03-11
Time (UT) : -
Comment : A zoom in on the core.

M92, earlier setup

M92 globular cluster 2015
Object : M92
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.
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Messier 92

Go Back

Advertisement / Annons: