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I agreeImaging telescopes or lenses:Celestron 1100HD, Explore Scientific 152 mm Carbon Fiber, Stellarvue 102mm Raptor
Imaging camera:ZWO ASI1600MM-Cool
Mounts:Astro-Physics Mach 1 GTO, Celestron CGX on Pier
Guiding telescopes or lenses:Stellarvue 50mm Guidescope, Orion 80mm Short Tube
Guiding camera:Starlight Xpress Lodestar x2
Software:Sequence Generator Pro, PixInsight, PHD2, Photoshop CS5, SkySafari Pro
Filters:Astrodon Ha 5nm, Astrodon Green Tru-Balance E-Series Gen 2, Astrodon Lum Tru-Balance E-Series Gen 2, Astrodon Blue Tru-Balance E-Series Gen 2, Astrodon Red Tru-Balance E-Series Gen 2, Astrnomik CLS-CCD
Accessories:QHYCCD PoleMaster, Celestron OAG, ZWO 8x 1.25" Filter Wheel (EFW), MoonLite CFL 2.5" Large Format Focuser
Resolution: 3842x4800
Dates:Jan. 3, 2017, April 23, 2017, April 24, 2017, Nov. 24, 2017, Nov. 30, 2017, May 5, 2018, May 11, 2018, May 22, 2018, May 23, 2018
Frames:
Astrnomik CLS-CCD: 1005x60" -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 20x180" (gain: 139.00) -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 100x60" (gain: 139.00) -20C bin 1x1
Astrodon Blue Tru-Balance E-Series Gen 2: 143x60" -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 20x180" (gain: 139.00) -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 100x60" (gain: 139.00) -20C bin 1x1
Astrodon Green Tru-Balance E-Series Gen 2: 143x60" -20C bin 1x1
Astrodon Ha 5nm: 178x240" (gain: 139.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 69x180" (gain: 139.00) -20C bin 1x1
Astrodon Lum Tru-Balance E-Series Gen 2: 665x30" -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 20x180" (gain: 139.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 100x60" (gain: 139.00) -20C bin 1x1
Astrodon Red Tru-Balance E-Series Gen 2: 144x60" -20C bin 1x1
Integration: 52.8 hours
Darks: ~50
Flats: ~50
Flat darks: ~50
Bias: ~250
Avg. Moon age: 15.19 days
Avg. Moon phase: 41.13%
Bortle Dark-Sky Scale: 6.12
Astrometry.net job: 2237354
RA center: 149.033 degrees
DEC center: 69.328 degrees
Pixel scale: 0.657 arcsec/pixel
Orientation: 324.596 degrees
Field radius: 0.561 degrees
Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States
Data source: Backyard
I decided to try a mosaic using four different data sets taken with three different telescopes over the past couple years captured from my red zone back yard.
M81 and M82 are a pair of galaxies in the constellation Ursa Major. The pair are located approximately 10 degrees northwest of the "Big Dipper" pointer star Dubhe (Alpha Ursae Majoris). The apparent separation of the galaxies is 31 arc-minutes but at a distance of 12 million light-years, their actual distances from each other is 150,000 light years. They are the largest members of the M81 Group, a physical association of of 34 galaxies.
M81:
Messier 81 or M81 (also designated NGC 3031) is a spiral galaxy in the constellation Ursa Major. It has an apparent visual magnitude of 6.9 and its angular diameter is 21x10 arc-minutes. M81 lies at an estimated distance of 12 million light years. The Equinox 2000 coordinates are RA= 9h 55.6m, Dec= +69° 04´. As one of the more famous objects in the Messier Catalog, it is commonly known as the Bode´s Galaxy. Although included in the Messier Catalog, this spiral galaxy was actually discovered by J. E. Bode in 1774. According to Stoyan et al. (2010), the distance of M81 is 11.8 million light years and its diameter is 92,000 light years. Its estimated mass is 50 billion solar masses.
M82:
Messier 82 or M82 (also designated NGC 3034) is a starburst galaxy in the constellation Ursa Major. It has an apparent visual magnitude of 8.4 and its angular diameter is 9x4 arc-minutes. M82 lies at an estimated distance of 12 million light years. The Equinox 2000 coordinates are RA= 9h 55.8m, Dec= +69° 41´. As one of the more famous objects in the Messier Catalog, it is commonly known as the Cigar Galaxy. In spite of its inclusion in the Messier Catalog, this peculiar galaxy was actually discovered by J. E. Bode in 1774. M82 has an irregular, distorted disk due to the gravitaional interaction of its larger neighbor M81. It is known as a starburst galaxy since it is the site of intense star-forming activity. According to Stoyan et al. (2010), the distance of M82 is 11.5 million light years and its diameter is 37,000 light years. Its estimated mass is 50 billion solar masses.
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