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Double Star
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| 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:
(Click on the image to get one in full resolution in a new window)
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| Date : | 2023-03-15 |
| Time (UT) : | 21:53 to 22:42 |
| Mount : | SkyWatcher EQ6 Pro, beltdrive modified (DIY 2019) |
| Guide : | QHY5 camera with 200 mm f/3.5 lens |
| Lens/telescope : | Pentax 645 300 mm ED f/4 (medium format lens) |
| Corrector/Barlow : | - |
| Field (FOV) : | 6.8x4.5o (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 : | 60x30 seconds, iso1600, dithering mode |
| 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 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| 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:
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| Date : | 2023-03-15 |
| Time (UT) : | 21:53 to 22:42 |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | Crop around the binary star, but they are too close and this long exposure saturated them to one big blob. |
Plate solved, crop:
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| Date : | 2023-03-15 |
| Time (UT) : | 21:53 to 22:42 |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| 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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