Bortle 8: city skyA city sky. Star clusters, the Moon, the planets and emission nebulae with a dual-band filter are good targets. Faint galaxies are difficult.
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Challenges for this skyAn image from a Bortle 8 sky counts for these challenges.
City starter from Bortle 7+Bortle 7+The 10 brightest Messier objects north of declination -19°. From Europe and North America they rise high above the horizon. Only images from a sky of Bortle class 7, 8 or 9 count.10 objects
City starter from Bortle 8+Bortle 8+The 10 brightest Messier objects north of declination -19°. From Europe and North America they rise high above the horizon. Only images from a sky of Bortle class 8 or 9 count.10 objects
Messier from Bortle 7+Bortle 7+The 110 objects of Charles Messier's catalog, from a city sky. Only images from a sky of Bortle class 7, 8 or 9 count.110 objects
Messier from Bortle 8+Bortle 8+The 110 objects of Charles Messier's catalog, from a city sky. Only images from a sky of Bortle class 8 or 9 count.110 objects
Best images from Bortle 8The Bortle class of an image comes from the light pollution map at its position, or from the owner. The map never gives class 9. For class 9, the owner sets the class.
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