NGC 7549 is a peculiar barred spiral galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 4,373±26 km/s, which corresponds to a Hubble distance of 210.4 ± 14.8 Mly (64.50 ± 4.53 Mpc). However, five non-redshift measurements give a closer mean distance of 187.41 ± 14.74 Mly (57.460 ± 4.518 Mpc). It was discovered by Irish engineer Bindon Stoney on 2 November 1850.
NGC 7549 has an 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.
Hickson Compact Group 93
NGC 7549 is a member of the Hickson Compact Group HCG 93. This five member group of galaxies also contains NGC 7547, NGC 7550, NGC 7553, and NGC 7558.
Arp 99
NGC 7549 along with NGC 7547 and NGC 7550 are listed together as Arp 99 in Halton Arp's Atlas of Peculiar Galaxies as Arp 99, as an example of spirals with companions attached to spiral arms.
Supernovae
Two supernovae have been observed in NGC 7549:
- SN 2009nq (Type Ia, mag. 16.2) was discovered by the Robotic Optical Transient Search Experiment (ROTSE) on 28 December 2009.
- SN 2019fya (Type II, mag. 16.3) was discovered by Kōichi Itagaki on 24 May 2019.
