NGC 7456
NGC 7456 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Grus
Right ascension	23h 02m 10.3631s[1]
Declination	−39° 34′ 09.804″[1]
Redshift	0.003999±0.000007[1]
Heliocentric radial velocity	1,199±2 km/s[1]
Distance	50.33 ± 2.11 Mly (15.430 ± 0.648 Mpc)[1]
Group or cluster	LDC 1547 group
Apparent magnitude (V)	12.78[1]
Characteristics
Type	SA(s)cd[1]
Size	~117,100 ly (35.91 kpc) (estimated)[1]
Apparent size (V)	5.5′ × 1.6′[1]
Notable features	Multiple X-ray sources
Other designations
ESO 346- G 026, IRAS 22594-3950, MCG -07-47-011, PGC 70304[1]

NGC 7456 is a spiral galaxy in the constellation of Grus. Its velocity with respect to the cosmic microwave background is 944±18 km/s, which corresponds to a Hubble distance of 45.4 ± 3.3 Mly (13.92 ± 1.01 Mpc).^[1] Additionally, 23 non-redshift measurements give a farther mean distance of 50.33 ± 2.11 Mly (15.430 ± 0.648 Mpc).^[2] It was discovered by British astronomer John Herschel on 4 September 1834.^[3][4]

NGC 7456 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.^[5]

X-ray sources

NGC 7456 contains as many as five ultraluminous X-ray sources. ULX-1 exhibits pronounced variability, with its flux changing over intervals ranging from several hundred seconds to a few kiloseconds, representing one of the most extreme flux fluctuations recorded among ULXs. Two of the five sources are considered transient ULX candidates.^[6]

LDC 1547 group

NGC 7456 is a member of the LDC 1547 galaxy group, which contains 16 galaxies, including NGC 7404 [fr], NGC 7410, NGC 7418, NGC 7421, NGC 7424, NGC 7462 [fr], IC 1459, IC 5264 [fr], IC 5269 [fr], IC 5270 [fr], IC 5271 [fr], IC 5273 [fr], and 3 galaxies from the ESO Catalogue.^[7][8]

Image gallery

• 
  NGC 7456 imaged by the James Webb Space Telescope
• 
  NGC 7456 imaged by Legacy Surveys

See also

• List of NGC objects (7001–7840)

References

External links

• Media related to NGC 7456 at Wikimedia Commons
• NGC 7456 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images