NGC 7769

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

{{Use dmy dates|date=November 2024}}

{{Sky|23|51|03.9592|+|20|09|01.508}}

{{Infobox Galaxy

| name = NGC 7769

| image = NGC7769 - SDSS DR14.jpg

| caption= The spiral galaxy NGC 7769

| constellation name = Pegasus

| epoch = J2000

| type = (R)SA(rs)b{{cite web

| website=NASA/IPAC Extragalactic Database

| publisher = NASA and Caltech

| title=Results for object NGC 7769

| url=https://ned.ipac.caltech.edu/byname?objname=NGC+7769

| access-date=2 August 2024}}

| ra = {{RA|23|51|03.9592}}

| dec = {{DEC|+20|09|01.508}}

| dist_ly = {{convert|56.85 ± 4.00|Mpc|Mly|abbr=on|lk=on|order=flip}}

| group_cluster = NGC 7771 Group (LGG 483)

| z = 0.014046

| h_radial_v = 4211 ± 2 km/s

| appmag_v = 12.0

| size_v = {{Val|3.2|×|2.7|u=arcminute}}

| size = ~{{convert|54.14|kpc|ly|abbr=on|lk=on|order=flip}} (estimated)

| names = {{odlist | MRK= 9005 |name= HOLM 820C | PGC= 72615 | UGC= 12808 | CGCG= 455-054 | MCG= +03-60-030 | IRAS= 23485+1952 | 2MASX= J23510396+2009014}}

}}

NGC 7769 is an unbarred spiral galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 3855 ± 25 km/s, which corresponds to a Hubble distance of 56.85 ± 4 Mpc (~185 million light-years). It was discovered by German-British astronomer William Herschel on 18 September 1784.{{cite web | url = https://cseligman.com/text/atlas/ngc77a.htm#7769 | title = New General Catalogue Objects: NGC{{nbsp}}7769 | last = Seligman | first = Courtney | website = Celestial Atlas | access-date = 15 December 2024}}

The galaxies NGC 7769, together with NGC 7770 and NGC 7771, are listed together as Holm 820 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.{{cite journal | bibcode=1937AnLun...6....1H | title=A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems | last1=Holmberg | first1=Erik | journal=Annals of the Observatory of Lund | date=1937 | volume=6 | page=1}} NGC 7769 also is listed as part of the five-member NGC 7771 Group (also known as LGG 483), which contains the 3 galaxies from Holm 820, NGC 7786, and UGC 12828.{{cite journal | bibcode=1993A&AS..100...47G | title=General study of group membership. II. Determination of nearby groups | last1=Garcia | first1=A. M. | journal=Astronomy and Astrophysics Supplement Series | date=1993 | volume=100 | page=47}}

NGC 7769 is a LINER galaxy, i.e. it has a type of nucleus that is defined by its spectral line emission which has weakly ionized or neutral atoms, while the spectral line emission from strongly ionized atoms is relatively weak.