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supergalactic coordinate system

(celestial coordinate system system based upon the supergalactic plane)

The supergalactic coordinate system is a spherical coordinate system used for directions in the celestial sphere, fixed to the supergalactic plane, and the line intersecting that plane with the galactic plane. The supergalactic plane is a determination of an apparent plane that nearby galaxy clusters neighbor, including the Virgo Cluster, the Great Attractor and the Perseus-Pisces Supercluster. The system's spherical elements are supergalactic longitude (SGL or l), and supergalactic latitude (SGB or b).

defining directions supergalactic galactic equatorial (approx.)
"supergalactic north pole" +90° l=47.37° b=+6.32° J185501+154232.2
"supergalactic zero point" 0° 0° l=137.37° b=0° J024914.4+593141.8

The above galactic coordinates are exact by definition. Gérard de Vaucouleurs devised the system based upon his determination of a supergalactic plane, including them in his 1976 catalog of galaxies, Second reference catalogue of bright galaxies.


(coordinate system,celestial sphere)
Further reading:
https://en.wikipedia.org/wiki/Supergalactic_coordinate_system
http://astronomy.swin.edu.au/cosmos/S/Supergalactic+Coordinate+System
https://dictionary.obspm.fr/index.php?formSearchTextfield=supergalactic+coordinate+system&showAll=1
https://ui.adsabs.harvard.edu/abs/2000MNRAS.312..166L/abstract
https://ui.adsabs.harvard.edu/abs/1976RC2...C......0D/abstract
https://heasarc.gsfc.nasa.gov/W3Browse/all/rc3.html
https://www.daviddarling.info/encyclopedia/S/supergalactic_plane.html

Referenced by pages:
celestial coordinate system
ecliptic

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