NGC 391

NGC 391
SDSS image of NGC 391
Observation data (J2000 epoch)
ConstellationCetus
Right ascension01h 07m 22.5865s
Declination+00° 55′ 33.403″
Redshift0.017829±0.00000667
Heliocentric radial velocity5,345±2 km/s
Distance241.6 ± 17.0 Mly (74.07 ± 5.20 Mpc)
Apparent magnitude (V)14.1g
Characteristics
Type(R')SA0−:
Size~94,800 ly (29.08 kpc) (estimated)
Apparent size (V)0.89′ × 0.75′
Other designations
2MASX J01072255+0055331, UGC 693, MCG +00-03-075, PGC 3976, CGCG 384-077

NGC 391 is an unbarred lenticular galaxy located in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 5,022±23 km/s, which corresponds to a Hubble distance of 241.6 ± 17.0 Mly (74.07 ± 5.20 Mpc). Additionally, one non-redshift measurement gives a farther distance of 272 Mly (83.3 Mpc). It was discovered by American astronomer George Bond on January 8, 1853. It was described by Dreyer as "faint, small, mottled but not resolved (Auwers 9)."

Supernova

One supernova has been observed in NGC 391: SN 2025rat (Type Ia, mag. 19.9454) was discovered by Zwicky Transient Facility on 11 July 2025.

See also

References

  1. 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 0391". NASA/IPAC Extragalactic Database. Retrieved September 2, 2016.
  2. ↑ "Distance Results for NGC 391". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved July 13, 2025.
  3. ↑ "New General Catalog Objects: NGC 350 - 399". Cseligman. Retrieved January 13, 2017.
  4. ↑ "SN 2025rat". Transient Name Server. IAU. Retrieved July 17, 2025.