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NGC 718

Coordinates: Sky map 01h 53m 13.2826s, +04° 11′ 44.805″
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NGC 718
Image
NGC 718 imaged by SDSS
Observation data (J2000 epoch)
ConstellationPisces
Right ascension01h 53m 13.2826s[1]
Declination+04° 11′ 44.805″[1]
Redshift0.005781±0.0000300[1]
Heliocentric radial velocity1,733±9 km/s[1]
Distance69.7 ± 5.0 Mly (21.38 ± 1.54 Mpc)[1]
Group or clusterNGC 676 group
Apparent magnitude (V)12.59[1]
Characteristics
TypeSAB(s)a[1]
Size~99,000 ly (30.35 kpc) (estimated)[1]
Apparent size (V)2.3′ × 2.0′[1]
Other designations
IRAS 01506+0357, 2MASX J01531331+0411453, UGC 1356, MCG +01-05-041, PGC 6993, CGCG 412-039[1]

NGC 718 is an intermediate spiral galaxy in the constellation of Pisces. Its velocity with respect to the cosmic microwave background is 1,450±22 km/s, which corresponds to a Hubble distance of 69.7 ± 5.0 Mly (21.38 ± 1.54 Mpc).[1] Additionally, one non-redshift measurement gives a similar distance of 69.80 Mly (21.400 Mpc).[2] It was discovered by German-British astronomer William Herschel on 13 December 1784.[3][4]

NGC 718 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]

A star-forming disk has been detected around the core of NGC 718. The size of its semi-major axis is estimated at 1,100 ly (330 pc).[7]

Supermassive black hole

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Based on measurements of the near-infrared K-band luminosity of the galaxy's bulge, NGC 718 has a supermassive black hole with a mass of 1×107.5M☉ (32 million solar masses).[8]

NGC 676 group

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NGC 718 is a member of a small group of three galaxies known as the NGC 676 group. The other two galaxies are NGC 676 and NGC 693 [fr].[9]

Intermediate-luminosity red transient

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One intermediate-luminosity red transient (ILRT) has been observed in NGC 718:

  • AT 2019udc (Type ILRT, mag. 18.813) was discovered by the Distance Less Than 40 Mpc Survey (DLT40) on 4 November 2019.[10] This object had initially been classified as a luminous blue variable.[11][12]

See also

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References

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  1. 1 2 3 4 5 6 7 8 9 10 11 "Results for object NGC 0718". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 27 December 2025.
  2. ↑ "Distance Results for NGC 0718". NASA/IPAC Extragalactic Database. NASA. Retrieved 27 December 2025.
  3. ↑ Herschel, William (1786). "Catalogue of One Thousand New Nebulae and Clusters of Stars" (PDF). Philosophical Transactions of the Royal Society of London. 76: 457–499. Bibcode:1786RSPT...76..457H. doi:10.1098/rstl.1786.0027.
  4. ↑ Seligman, Courtney. "New General Catalogue Objects: NGC 718". Celestial Atlas. Retrieved 27 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 718". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 December 2025.
  7. ↑ Comerón, S.; Knapen, J. H.; Beckman, J. E.; Laurikainen, E.; Salo, H.; Martínez-Valpuesta, I.; Buta, R. J. (2010). "AINUR: Atlas of Images of NUclear Rings". Monthly Notices of the Royal Astronomical Society. 402 (4): 2462. arXiv:0908.0272. Bibcode:2010MNRAS.402.2462C. doi:10.1111/j.1365-2966.2009.16057.x.
  8. ↑ 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.
  9. ↑ Mahtessian, A. P. (1998). "Groups of galaxies. III. Some empirical characteristics". Astrophysics. 41 (3): 308–321. Bibcode:1998Ap.....41..308M. doi:10.1007/BF03036100.
  10. ↑ Valerin, G.; et al. (2025). "A study in scarlet: I. Photometric properties of a sample of intermediate-luminosity red transients". Astronomy and Astrophysics. 695. arXiv:2407.21671. Bibcode:2025A&A...695A..42V. doi:10.1051/0004-6361/202451733.
  11. ↑ "AT 2019udc". Transient Name Server. IAU. Retrieved 27 December 2025.
  12. ↑ Siebert, M. R.; Dimitriadis, G.; Kilpatrick, C. D.; Foley, R. J.; Nunez, R.; McKinnon, K.; Guhathakurta, P. (2019). "Spectroscopic Classification of AT2019udc with the Lick Shane telescope". The Astronomer's Telegram. 13263: 1. Bibcode:2019ATel13263....1S.
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  • Wikimedia Commons logo Media related to NGC 718 at Wikimedia Commons
  • NGC 718 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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