Edge Rewrite
restyle Source code View original
// HTMLRewriter · presentation

This page was redesigned at the edge.

Cloudflare fetched the original article and streamed it through HTMLRewriter to apply an entirely new visual system without rebuilding the source page.

Jump to content

NGC 818

Coordinates: Sky map 02h 08m 44.5464s, +38° 46′ 37.596″
From Wikipedia, the free encyclopedia

NGC 818
NGC 818 imaged by Pan-STARRS
Observation data (J2000 epoch)
ConstellationAndromeda
Right ascension02h 08m 44.5464s[1]
Declination+38° 46′ 37.596″[1]
Redshift0.014156±0.0000130[1]
Heliocentric radial velocity4,244±4 km/s[1]
Distance168.62 ± 8.37 Mly (51.700 ± 2.565 Mpc)[1]
Group or cluster[CHM2007] LDC 148
Apparent magnitude (V)13.20[1]
Characteristics
TypeSABc[1]
Size~171,700 ly (52.64 kpc) (estimated)[1]
Apparent size (V)3.0′ × 1.3′[1]
Other designations
IRAS 02057+3832, 2MASX J02084451+3846381, UGC 1633, MCG +06-05-086, PGC 8185, CGCG 522-116[1]

NGC 818 is an intermediate spiral galaxy in the constellation of Andromeda. Its velocity with respect to the cosmic microwave background is 4,010±17 km/s, which corresponds to a Hubble distance of 192.9 ± 13.5 Mly (59.14 ± 4.15 Mpc).[1] Additionally, 14 non-redshift measurements give a closer mean distance of 168.62 ± 8.37 Mly (51.700 ± 2.565 Mpc).[2] It was discovered by German-British astronomer William Herschel on 18 October 1786.[3][4]

NGC 818 has a possible active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.[5][6]

Galaxy group

[edit]

NGC 818 is a member of a galaxy group known as [CHM2007] LDC 148. The other galaxies in the group are NGC 834, NGC 841 [fr], NGC 845 [fr], UGC 1673 [d], and UGC 1721 [d].[7][8]

Supermassive black hole

[edit]

According to a paper based on measurements of the near-infrared K-band luminosity of the galaxy's bulge, NGC 818 has a supermassive black hole with a mass of 1×107.1M☉ (13 million solar masses).[9]

Supernova

[edit]

One supernova has been observed in NGC 818:

See also

[edit]

References

[edit]
  1. 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 818". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 19 December 2025.
  2. ↑ "Distance Results for NGC 818". NASA/IPAC Extragalactic Database. NASA. Retrieved 19 December 2025.
  3. ↑ Herschel, William (1789). "Catalogue of a Second Thousand of New Nebulae and Clusters of Stars; with a Few Introductory Remarks on the Construction of the Heavens". Philosophical Transactions of the Royal Society of London. 79: 212–255. Bibcode:1789RSPT...79..212H. doi:10.1098/rstl.1789.0021.
  4. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 818". Celestial Atlas. Retrieved 19 December 2025.
  5. ↑ Asmus, D.; Greenwell, C. L.; Gandhi, P.; Boorman, P. G.; Aird, J.; Alexander, D. M.; Assef, R. J.; Baldi, R. D.; Davies, R. I.; Hönig, S. F.; Ricci, C.; Rosario, D. J.; Salvato, M.; Shankar, F.; Stern, D. (2020). "Local AGN survey (LASr): I. Galaxy sample, infrared colour selection, and predictions for AGN within 100 MPC". Monthly Notices of the Royal Astronomical Society. 494 (2): 1784. arXiv:2003.05959. Bibcode:2020MNRAS.494.1784A. doi:10.1093/mnras/staa766.
  6. ↑ "NGC 818". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 December 2025.
  7. ↑ Crook, Aidan C.; Huchra, John P.; Martimbeau, Nathalie; Masters, Karen L.; Jarrett, Tom; Macri, Lucas M. (2007). "Groups of Galaxies in the Two Micron All Sky Redshift Survey". The Astrophysical Journal. 655 (2): 790. arXiv:astro-ph/0610732. Bibcode:2007ApJ...655..790C. doi:10.1086/510201.
  8. ↑ "[CHM2007] LDC 148". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 December 2025.
  9. ↑ Dong, X. Y.; De Robertis, M. M. (2006). "Low-Luminosity Active Galaxies and Their Central Black Holes". The Astronomical Journal. 131 (3): 1236. arXiv:astro-ph/0510694. Bibcode:2006AJ....131.1236D. doi:10.1086/499334.
  10. ↑ Pollas, C.; Emond, J.-B.; Michel, F.; Prugniel, P.; Kirshner, R.; Gordon, S. (1992). "Supernova 1992az in NGC 818". International Astronomical Union Circular (5625): 1. Bibcode:1992IAUC.5625....1P.
  11. ↑ "SN 1992az". Transient Name Server. IAU. Retrieved 19 December 2025.
[edit]
  • Wikimedia Commons logo Media related to NGC 818 at Wikimedia Commons
  • NGC 818 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Retrieved from "https://en.wikipedia.org/w/index.php?title=NGC_818&oldid=1343390258"