| 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 |
| Exp. time : | 73x60 seconds at ISO400, dithering every 3rd image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | flat, astrometric color calibrated, crop |
| Weather : | Moon phase 95%, almost clear sky, temperature -5o C |
| Comment : |
A crop around the galaxies M109 (upper left) and NGC 3953.
The bright star is Gamma Ursae Majores, magnitude 2.4.
There are at least 14 galaxies in the full resolution photo.
You find them here: M109 Astro metry plate solved.
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| Exp. time : | 120x60 seconds at ISO400, dithering every 3rd image |
| Image process tool : | Siril, Gimp, Irfanview |
| Processing : | flat, astrometric color calibrated, crop 800x800 pixel 1:1 scale |
| Weather : | Moon phase 57%, clear sky, temperature -8o C |
| Comment : |
With 15 times more exposure and the Nikon camera it got some better even in this Bortle 9 area. |
| 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 |
| 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. |
| 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 |
| 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. |
English
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