NGC 7408

ConstellationTucana

Right ascension22^h 55^m 56.8877^s[1]

Declination−63° 41′ 40.732″^[1]

Redshift0.011656±0.0000310^[1]

NGC 7408
NGC 7408 imaged by Legacy Surveys
Observation data (J2000 epoch)
Constellation	Tucana
Right ascension	22h 55m 56.8877s[1]
Declination	−63° 41′ 40.732″[1]
Redshift	0.011656±0.0000310[1]
Heliocentric radial velocity	3,494±9 km/s[1]
Distance	142.80 ± 5.67 Mly (43.783 ± 1.739 Mpc)[1]
Group or cluster	NGC 7329 group (LGG 462)
Apparent magnitude (V)	13.33[1]
Characteristics
Type	SB(s)cd[1]
Size	~86,200 ly (26.42 kpc) (estimated)[1]
Apparent size (V)	1.5′ × 1.2′[1]
Other designations
ESO 109- G 026, IRAS 22527-6357, 2MASX J22555688-6341411, PGC 070037[1]

NGC 7408 is a barred spiral galaxy in the constellation of Tucana. It has an apparent visual magnitude of 13.33 and an angular size of 1.5′ × 1.2′. Its velocity with respect to the cosmic microwave background is 3,372±13 km/s, which corresponds to a Hubble distance of 162.2 ± 11.4 Mly (49.73 ± 3.49 Mpc).^[1] However, 12 non-redshift measurements give a closer mean distance of 142.80 ± 5.67 Mly (43.783 ± 1.739 Mpc).^[2] It was discovered by British astronomer John Herschel on 1 November 1834.^[3][4]

The morphological classification of NGC 7408 is SB(s)cd^[1], indicating a barred spiral form (SB) with no ring structure (s) and closely wound spiral arms (cd). It 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.^[5][6]