NGC 6209 is a spiral galaxy in the constellation of Apus. Its velocity with respect to the cosmic microwave background is , which corresponds to a Hubble distance of . However, 13 non-redshift measurements give a closer mean distance of . It was discovered by British astronomer John Herschel on 28 June 1835.
NGC 6209 is a Seyfert II galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable. Additionally, NGC 6209 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.
Supernovae Two supernovae have been observed in NGC 6209: SN 1998cx (TypeIa, mag. 17.8) was discovered by Alexander Wassilieff on 4 July 1998. SN 2009fz (TypeIIb, mag. 16.5) was discovered by the CHilean Automatic Supernova sEarch (CHASE) on 8 June 2009.
See also List of NGC objects (6001–7000)
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