Astronomy:NGC 391
From HandWiki
| NGC 391 | |
|---|---|
 SDSS image of NGC 391 | |
| Observation data (J2000 epoch) | |
| Constellation | Cetus |
| Right ascension | 01h 07m 22.5865s[1] |
| Declination | +00° 55′ 33.403″[1] |
| Redshift | 0.017829±0.00000667[1] |
| Helio radial velocity | 5,345±2 km/s[1] |
| Distance | 241.6 ± 17.0 Mly (74.07 ± 5.20 Mpc)[1] |
| Apparent magnitude (V) | 14.1g[1] |
| Characteristics | |
| Type | (R')SA0−:[1] |
| Size | ~94,800 ly (29.08 kpc) (estimated)[1] |
| Apparent size (V) | 0.89′ × 0.75′[1] |
| Other designations | |
| UGC 693, MCG+00-03-075, PGC 3976[1] | |
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).[1] Additionally, one non-redshift measurement gives a farther distance of 272 Mly (83.3 Mpc).[2] 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)."[3]
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.[4]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object NGC 0391". http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=NGC+391&extend=no&hconst=73&omegam=0.27&omegav=0.73&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ "Distance Results for NGC 391". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+391.
- ↑ "New General Catalog Objects: NGC 350 - 399". Cseligman. http://cseligman.com/text/atlas/ngc3a.htm#391.
- ↑ "SN 2025rat". IAU. https://www.wis-tns.org/object/2025rat.
External links
Coordinates: 
01h 07m 22.5865s, +00° 55′ 33.403″
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