Astrophysics (Index)About

Cygnus Loop

(W78, Sharpless 103)
(supernova remnant in Cygnus)

The Cygnus Loop is a loop-shaped radio source (emission nebula) interpreted as a supernova remnant, the loop interpreted as material ejected from the supernova (SN) which has traveled considerable distance. It spans considerable angular size, and portions of it are visible, collectively known as the Veil Nebula, which includes visible nebulae NGC 6960, NGC 6992, NGC 6995, and IC 1340. Determination of the date of the SN depends on the determination of the distance, which is challenging and has varied: a recent Gaia determination is 735 pc which suggests the SN occurred 21,000 years ago, but some determinations have been a fraction of that. There have been searches for an associated neutron star (such as was found in the Crab Nebula) but none has been identified.

(nebula,supernova remnant)
Further reading:
/Lookback Years
~0735pc2.40klyCygnus Loop
Coordinates:Cygnus Loop