Astronomy:NGC 7769
| NGC 7769 | |
|---|---|
 NGC 7769 imaged by SDSS | |
| Observation data (J2000 epoch) | |
| Constellation | Pegasus |
| Right ascension | 23h 51m 03.9592s[1] |
| Declination | +20° 09′ 01.508″[1] |
| Redshift | 0.014046[1] |
| Helio radial velocity | 4211 ± 2 km/s[1] |
| Distance | 185.4 ± 13.0 Mly (56.85 ± 4.00 Mpc)[1] |
| Group or cluster | NGC 7771 Group (LGG 483) |
| Apparent magnitude (V) | 12.0[1] |
| Characteristics | |
| Type | (R)SA(rs)b[1] |
| Size | ~176,600 ly (54.14 kpc) (estimated)[1] |
| Apparent size (V) | 3.2′ × 2.7′[1] |
| Other designations | |
| HOLM 820C, IRAS 23485+1952, UGC 12808, MCG+03-60-030, PGC 72615[1] | |
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).[1] It was discovered by German-British astronomer William Herschel on 18 September 1784.[2]
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.[3] 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.[4]
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.[1]
Supernovae
Three supernovae have been observed in NGC 7769:
- SN 2019iex (Type II, mag. 17.6) was discovered by the Searches After Gravitational-waves using ARizona Observatories (SAGUARO) project on 26 June 2019.[5]
- SN 2022mxv (Type II, mag. 18.249) was discovered by ATLAS on 18 June 2022.[6]
- SN 2022aedu (Type II, mag. 16.9) was discovered by Kōichi Itagaki on 31 December 2022.[7]
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 1.11 "Results for object NGC 7769". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=NGC+7769.
- ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 7769". https://cseligman.com/text/atlas/ngc77a.htm#7769.
- ↑ Holmberg, Erik (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund 6: 1. Bibcode: 1937AnLun...6....1H.
- ↑ Garcia, A. M. (1993). "General study of group membership. II. Determination of nearby groups". Astronomy and Astrophysics Supplement Series 100: 47. Bibcode: 1993A&AS..100...47G.
- ↑ "SN 2019iex". IAU. https://www.wis-tns.org/object/2019iex.
- ↑ "SN 2022mxv". IAU. https://www.wis-tns.org/object/2022mxv.
- ↑ "SN 2022aedu". IAU. https://www.wis-tns.org/object/2022aedu.
External links
- NGC 7769 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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