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Contains:  NGC 5477, M 101, NGC 5457
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The Pinwheel Galaxy (Messier 101)

Technical card

Resolution: 3007x2405

Dates:Feb. 2, 2019March 8, 2019March 9, 2019March 23, 2019March 28, 2019April 5, 2019

Frames:
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 39x30" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 3x45" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - B 36mm: 143x60" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - G 36mm: 169x60" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - L 36mm: 386x20" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - L 36mm: 412x30" (gain: 76.00) -20C bin 1x1
Astrodon Tru-Balance Gen2 E-Series - R 36mm: 172x60" (gain: 76.00) -20C bin 1x1
Astrodon Narrowband 5nm Ha: 58x360" (gain: 139.00) -20C bin 1x1

Integration: 19.8 hours

Darks: ~50

Flats: ~20

Flat darks: ~50

Bias: ~100

Avg. Moon age: 11.95 days

Avg. Moon phase: 25.73%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2696685

RA center: 210.799 degrees

DEC center: 54.388 degrees

Pixel scale: 0.913 arcsec/pixel

Orientation: 352.761 degrees

Field radius: 0.488 degrees

Locations: Home Observatory, Schenectady, New York, United States

Data source: Backyard

Description

The Pinwheel Galaxy (M101) is a face-on spiral galaxy, 23 million light years from Earth in the constellation Ursa Major.

M101 has a high population of H II regions, many of which are very large and bright. H II regions usually accompany the enormous clouds of high density molecular hydrogen gas contracting under their own gravitational force where stars form. H II regions are ionized by large numbers of extremely bright and hot young stars; those in M101 are capable of creating hot superbubbles. In a 1990 study, 1264 H II regions were cataloged in the galaxy. Three are prominent enough to receive New General Catalogue numbers - NGC 5461, NGC 5462, and NGC 5471. (source: Wikipedia)

ZWO ASI1600 MM Pro
LRGB data: Gain 76, Offset 30
Ha data: Gain 139, Offset 50

Comments

Author

lucam_astro
Luca Marinelli
License: None (All rights reserved)
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The Pinwheel Galaxy (Messier 101), 





    
        

            Luca Marinelli