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Galaxy
Messier 109


Object : M109
Coordinates/Direction : RA: 11h57m, DEC: +53o22'
Object size : 7.6' x 4.7'
Object magnitude : 10.6
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Messier 109

M109 2024-02-25

M109 Galaxy, 2024
Date : 2024-02-25
Time (UT) : 19:14 to 19:21
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
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 : 4x120 seconds at ISO1600
Image process tool : Siril, Gimp, Irfanview
Processing : bias, flat, astrometric col calibrated, crop 800x800 pix 1:1 scale
Weather : clear sky for a half hour, full Moon, 0o C
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o
Comment : This evening I saw from the window that the sky was dark, the weather forecast say clouds. I took out the telescope at 6 pm and let it cool down for two hours. Started to take some photos but after just 30 minutes the clouds came in. Nothing more to do than take the telescope indoors, I only got 4 photos. But I put it up here for you to see how it looks with this short 8 minute exposure. There are some red dots, that's hot pixels, with only 4 photos the dithering process can't cancel these hot pixels out. Sad about the clouds because it was 12 years since I pointed a long focal length telescope against this galaxy. Next clear sky I try to take a photo once again. It's an small and weak galaxy.

M109 2013-11-25

M109 Galaxy, 2019
Date : 2013-11-24
Time (UT) : 23:51 to 00:05
Mount : SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019)
Lens/telescope : Pentax 500 mm f/4.5 (medium/35mm format lens)
Corrector/Barlow : -
Field (FOV) : 4.1x2.7o (full frame) before crop
camera : Canon 5D Mk I, QE=0.25, full frame, 12 Mpixel, 12 bit
camera temperature: About 3o C above surrounding temperature
Film/CCD : Raw, Cr2
Filter : none
Control system : Mount by EQMOD, camera by APT, ASCOM Windows PC
Exp. time : 20x30 seconds at ISO1000
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : level, cal flat, dithering no bias dark noise filter
Weather : clear with some clouds drifting by
Site : Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o
Comment : I had a lot of old photos on the hard disc which was unprocessed. They have got a rotation flag set that cause some of my image editors software to give up. Now after I solved that problem with this rotation flag set technique I can process them and compare with todays photos.

One of my first photos with a full frame camera, the first Canon 5D (Mk I). The lens was an early 1970s Pentax with not so good color handling which cause a lot of problem, you see the red halos around the bright stars.
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