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Galaxy
UGC 10822, Draco Dwarf


Object : UGC 10822
Coordinates/Direction : RA: 17h20m, DEC: +57o54'
Object size : 35.5' x 24.5'
Object magnitude : 10.9
More to know : Wikipedia:
https://en.wikipedia.org/ wiki/ Draco Dwarf

UGC 10822 galaxy 2020-03-18

UGC 10822 galaxy, Draco Dwarf, 2020 (click on the image to get a full resolution photo in a new window)
Date : 2020-03-18
Time (UT) : 20:53 to 22:41
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera, 400 mm f/6.3 guide telescope
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Field flattener 3" x1
Filter : none
camera : Canon 6D, controlled by APT software
Film/CCD : Raw
Exp. time : 80x60 seconds, iso1600
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : resize, level, cal dark & bias with dithering technique, synthetic flat cal
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : Last time I couldn't see any trace of the weak galaxy. Now I spend more time on this object. It's a big object, about the size of the Moon, but the surface brightness is very weak.

UGC 10822 galaxy 2020-03-18, zoom in on the central area

UGC 10822 galaxy, Draco Dwarf, 2020
Date : 2020-03-18
Comment : The galaxy cover whole this image, I have increase the contrast to see if there is any trace of it. I must have a much darker sky to see it. Others who have taken photos of this galaxy has done it from Tinerife, much better place.

UGC 10822 galaxy 2019-03-05

UGC 10822 galaxy, Draco Dwarf, 2020 (click on the image to get a full resolution photo in a new window)
Date : 2019-03-05
Time (UT) : 21:50 to 23:29
Mount : EQ6 controlled by EQMOD
Guide : PHD2 in dithering mode and QHY5 camera, 400 mm f/6.3 guide telescope
Lens/telescope : TS130, 910mm f/7
Corrector/Barlow : Field flattener 3" x1
Filter : none
camera : Canon 6D
Film/CCD : Raw
Exp. time : 70x60 seconds, iso1600
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : resize, level, cal dark & bias with dithering technique, flat cal, noise filter
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : The galaxy UGC 10822, this time taken with my APO telescope, even if I can't find this galaxy there should be others. Still it's very empty of galaxies.

UGC 10822 galaxy 2019-03-05, plate solved

UGC 10822 galaxy, Draco Dwarf, plate solved, 2019 (click on the image to get a full resolution photo in a new window)
Date : 2019-03-05
Comment : I use the plate solver Astrometry.net and found these galaxies, click on the image and get it in full resolution. This was strange, the plate solver find that the coordinates are correct, the galaxy isn't small, about 0.5 degree, the same as Moon. The magnitude is 10.9, I should see it, what's the problem ?

Now I got an idea to what it is, it's the largest known concentration of dark matter ! See the wikipedia page.

UGC 10822 galaxy 2014-03-10

UGC 10822 galaxy, Draco Dwarf, 2014 (click on the image to get a full resolution photo in a new window)
Date : 2014-03-10
Time (UT) : 00:03 to 00:48
Mount : EQ6 Pro Synscan controlled by EQMOD
Guide : -
Lens/telescope : Pentax 500mm f/4.5 (f/6.3)
Corrector/Barlow : Builtin
Filter : none
camera : Canon 5D (Mk I)
Film/CCD : Raw
Exp. time : 53x30 seconds, iso1600
Image process tool : AstroImageJ, Fitswork, Irfanview
Processing : resize, level, cal dark & bias with dithering technique, flat cal, noise filter
Weather : clear
Site : Sweden, Stockholm, Hagsätra
Comment : The galaxy UGC 10822, the Draco Dwarf, can't find any galaxy at all.
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