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The Bortle dark-sky scale (usually referred to as simply the Bortle scale) is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution .
In order to describe how much light pollution there is at a particular location, astronomers classify night skies based on the Bortle Scale.
The Bortle scale is a nine-level measuring system used to track how much light pollution there is in the sky. A Bortle scale of four or less is required to see the Milky Way whilst one is "pristine", the darkest possible.
Location Area (in ha) Bortle Scale Status Notes Australia: The Jump-Up, Australian Age of Dinosaurs: Queensland: 1,400 1–2 Dark Sky Sanctuary Designated on April 27, 2019 Australia: Warrumbungle National Park: New South Wales: 23,312 1 Dark Sky Park Designated on July 4, 2016 Australia: Arkaroola Wilderness Sanctuary: South Australia: 63,000
All measurements of night sky luminance in the core area are darker than 21.3 mag/arcsec 2 (corresponding to Bortle scale 3), and in places are as dark as 21.8 mag/arcsec 2 (Bortle scale 1). Large parts of the Wairarapa region outside the core of the reserve exceed the minimum value of 21.2 mag/arcsec 2 required for the core.
In visible and infrared astronomy, surface brightness is often quoted on a magnitude scale, in magnitudes per square arcsecond (MPSAS) in a particular filter band or photometric system. Measurement of the surface brightnesses of celestial objects is called surface photometry.
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HD 35984 is star in the northern constellation Auriga.It has an apparent magnitude of 6.20, [2] which, according to the Bortle scale, indicates it is faintly visible to the naked eye from dark rural skies.