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  2. Surface brightness - Wikipedia

    en.wikipedia.org/wiki/Surface_brightness

    A truly dark sky has a surface brightness of 2 × 10 −4 cd m −2 or 21.8 mag arcsec −2. [9] [clarification needed] The peak surface brightness of the central region of the Orion Nebula is about 17 Mag/arcsec 2 (about 14 milli nits) and the outer bluish glow has a peak surface brightness of 21.3 Mag/arcsec 2 (about 0.27 millinits). [10]

  3. Low surface brightness galaxy - Wikipedia

    en.wikipedia.org/wiki/Low_surface_brightness_galaxy

    An image of NGC 45, a low surface brightness spiral galaxy, by GALEX. UGC 477 is located over 110 million light-years away in the constellation of Pisces. [1]A low-surface-brightness galaxy, or LSB galaxy, is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky.

  4. Photometry (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(astronomy)

    An object's surface brightness is its brightness per unit solid angle as seen in projection on the sky, and measurement of surface brightness is known as surface photometry. [9] A common application would be measurement of a galaxy's surface brightness profile, meaning its surface brightness as a function of distance from the galaxy's center.

  5. Fanaroff–Riley classification - Wikipedia

    en.wikipedia.org/wiki/Fanaroff–Riley...

    The Fanaroff–Riley classification is a scheme created by B.L. Fanaroff and J.M. Riley in 1974, [1] which is used to distinguish radio galaxies with active nuclei based on their radio luminosity or brightness of their radio emissions in relation to their hosting environment. Fanaroff and Riley noticed that the relative positions of high/low ...

  6. Dragonfly Telephoto Array - Wikipedia

    en.wikipedia.org/wiki/Dragonfly_Telephoto_Array

    Its main purpose is to take images of ultra-low surface brightness galaxies at visible wavelengths of light. It is well suited for this purpose because its lenses have specially-coated optical glass that reduces scattered light.

  7. Luminosity - Wikipedia

    en.wikipedia.org/wiki/Luminosity

    In contrast, the term brightness in astronomy is generally used to refer to an object's apparent brightness: that is, how bright an object appears to an observer. Apparent brightness depends on both the luminosity of the object and the distance between the object and observer, and also on any absorption of light along the path from object to ...

  8. Gegenschein - Wikipedia

    en.wikipedia.org/wiki/Gegenschein

    The intensity of the gegenschein is relatively enhanced because each dust particle is seen at full phase, [3] having a difficult to measure apparent magnitude of +5 to +6, with a very low surface brightness in the +10 to +12 magnitude range.

  9. Satellite galaxy - Wikipedia

    en.wikipedia.org/wiki/Satellite_galaxy

    Dwarf spheroidal satellite galaxies are characterized by their diffuse appearance, low surface brightness, high mass-to-light ratio (i.e. dark matter dominated), low metallicity, low gas fractions and old stellar population. [1] Moreover, dwarf spheroidals make up the largest population of known satellite galaxies of the Milky Way.

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