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Double Star
Grumium


Object : Grumium, binary double star, another name: Xi Draconis
Coordinates/Direction : RA: 17h53m, DEC: +56o52'
Object size : Double star separation 316"
Object magnitude : Primary 3.75, Secondary 16
More to know : Double Star, Wikipedia:
https://en.wikipedia.org/ wiki/ Double star

Grumium:
https://en.wikipedia.org/ wiki/ Xi Draconis

Grumium 2023-03-15:

Grumium, binary star, 2023 (Click on the image to get one in full resolution in a new window)
Date : 2023-03-15
Time (UT) : 21:53 to 22:42
Mount : Skywatcher EQ6 Pro controlled by EQMOD and KStars Ekos/Indi
Guide : Ekos internal guider in dithering mode, QHY5 camera with 200 mm f/3.5 lens
Lens/telescope : Pentax 645 300 mm ED f/4, external focus motor, Pentax 645 project page
Corrector/Barlow : -
Field (FOV) : 6.8x4.5 degree, before cropping
Filter : none
camera : Canon 6D, temperature +7 C. Controlled by KStars Ekos/Indi
Film/CCD : Raw
Exp. time : 60x30 seconds, iso1600
Image process tool : Siril, Gimp, Irfanview
Processing : flat calibration, no darks, synthetic bias, photometric color calibration
Weather : clear sky, temperature 0 C
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : A third double star this night. This also belong to the constellation Draco. See the full resolution image and zoom in. Can you recognize any object ?

Crop:

Grumium, binary star, 2023
Date : 2023-03-15
Time (UT) : 21:53 to 22:42
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : Crop around the binary star, but they are too close and this long exposure saturated them to one big blob.

Plate solved, crop:

Grumium, binary star, 2023
Date : 2023-03-15
Time (UT) : 21:53 to 22:42
Site : Sweden, Stockholm, Hagsätra. Bortle class 9
Comment : Near the middle of the full field image is this object, IC 1286. It's a spiral galaxy of magnitude 14.8, barely seen in this photo. There are many more objects in the full field image, look at this plate solved image by Astrometry: Grumium plate solved. It opens in a new window.
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