NGC 391

{{Short description|Galaxy in the constellation Cetus}}

{{Use mdy dates|date=January 2017}}

{{Infobox galaxy

| name = NGC 391

| image = NGC391 - SDSS DR14.jpg

| caption = SDSS image of NGC 391

| epoch = J2000

| ra = {{RA|01|07|22.5865}}{{cite web

| website = NASA/IPAC Extragalactic Database

| title = Results for object NGC 0391

| url = 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

| access-date = September 2, 2016}}

| dec = {{DEC|+00|55|33.403}}

| constellation name = Cetus

| z = {{val|0.017829|0.00000667}}

| h_radial_v = {{val|5345|2|u=km/s|fmt=commas}}

| dist_ly = {{convert|74.07 ± 5.20|Mpc|Mly|abbr=on|lk=on|order=flip}}{{r|ned}}

| type = (R')SA0⁻:

| appmag_v = 14.1g

| size_v = {{Val|0.89|×|0.75|u=arcminute}}

| size = ~{{convert|29.08|kpc|ly|abbr=on|lk=on|order=flip}} (estimated){{r|ned}}

| notes =

| names = {{odlist | UGC= 693 | CGCG= 384-077 | MCG= +00-03-075 | 2MASX= J01072255+0055331 | PGC= 3976}}

}}

NGC 391 is an unbarred lenticular galaxy located in the constellation Cetus. Its velocity with respect to the cosmic microwave background is {{val|5022|23|u=km/s|fmt=commas}}, which corresponds to a Hubble distance of {{convert|74.07 ± 5.20|Mpc|Mly|abbr=on|lk=on|order=flip}}.{{r|ned}} Additionally, one non-redshift measurement gives a farther distance of {{convert|83.3|Mpc|Mly|abbr=on|lk=off|order=flip}}.{{cite web | url = https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+391 | title = Distance Results for NGC 391 | website = NASA/IPAC EXTRAGALACTIC DATABASE | publisher = NASA | access-date = 13 July 2025}} 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)."{{cite web|title=New General Catalog Objects: NGC 350 - 399|url=http://cseligman.com/text/atlas/ngc3a.htm#391|publisher=Cseligman|access-date=January 13, 2017}}