M81: Spiral Galaxy in Ursa Major
M81: Spiral Galaxy in Ursa Major |
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M81 |
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Object Data |
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| Object type: | Spiral Galaxy | ||
| Size: | 90,000 light years diameter; 27 x 14 arc min | ||
| Magnitude: | 6.4 | ||
| Constellation: | Ursa Major | ||
| Distance: | 11.6 million light years | ||
Notes: |
The spiral arms contain young hot bluish stars
formed in the past few million years, while the core contains older red
stars. UV light from the hot stars is flourescing the surrounding
clouds of hydrogen gas in the spiral arms giving off the red colors. |
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Exposure Data |
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| Date: | 11/4 and 11/5/21 | ||
| Location: | Little Blair Valley, Anza Borrego Desert, CA | ||
| Telescope: | DSI RC10c. 1867 mm fl at f/7.3 | ||
| Camera: | FLI 6303E CCD camera with Astrodon Ha (3nm) and LRGB filters | ||
| Mount: | AP 1100 mount GTOCP3 | ||
| Exposure time: | Lum (16 x 10min); RGB (8 x 5 min each); Ha (10 x 15 min) | ||
| Exposure time total: | 6 hrs 50 min | ||
| Notes: | An Ha layer was added to the LRGB layer to bring out the abundant hydrogen gas in the spiral arms of this galaxy FOV = 37.4 x 29.8 arc minutes (cropped from original) |
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