NGC 6118

NGC 6118
NGC 6118 in almost-true colour: image-composite from images made with the VLT using its VIMOS imager.
Observation data (J2000 epoch)
ConstellationSerpens
Right ascension16h 21m 48.6s[1]
Declination−02° 17′ 00″[1]
Redshift0.005247 (1573 ± 1 km/s)[1]
Distance82.9 Mly (25.4 Mpc)[2]
Apparent magnitude (V)12.42[1]
Characteristics
TypeSA(s)cd[1]
Size110,000 ly (diameter)
Apparent size (V)4.7 x 2.0 arcmin[1]
Other designations
UGC 10350, MCG +00-42-002, PGC 57924, CGCG 024-008

NGC 6118 is a grand design spiral galaxy located 83 million light-years away in the constellation Serpens (the Snake). It was discovered on 14 April 1785 by German-British astronomer William Herschel.[3]

NGC 6118 measures roughly 110,000 light-years across; about the same as our own galaxy, the Milky Way. Its shape is classified as SA(s)cd, meaning that it is unbarred and has several rather loosely wound spiral arms. The large numbers of bright bluish knots are active star-forming regions where some very luminous and young stars can be perceived.[4]

Because NGC 6118 has loosely wound spiral open arms, no clear defined spiral arms like the Milky Way galaxy and lacks a central bar, the galaxy thus does not have a galactic habitable zone like the Milky Way.[5][6][7][8] For the Milky Way, the galactic habitable zone is commonly believed to be an annulus with an outer radius of about 10 kiloparsecs and an inner radius close to the Galactic Center, both of which lack hard boundaries.[7]

NGC 6118 is difficult to see with a small telescope. Amateur astronomers have nicknamed it the "Blinking Galaxy", as it has a tendency to flick in and out of view with different eye positions.[4]

  1. ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for NGC 6118. Retrieved 6 Dec 2008.
  2. ^ Conselice, C.J. (Nov 1997). "The Symmetry, Color, and Morphology of Galaxies". Publications of the Astronomical Society of the Pacific. 109: 1251–1255. arXiv:astro-ph/9710234. Bibcode:1997PASP..109.1251C. doi:10.1086/134004. S2CID 119348520.
  3. ^ Seligman, Courtney. "New General Catalogue Objects: NGC 6118". Celestial Atlas. Retrieved 5 September 2024.
  4. ^ a b "Explosions in Majestic Spiral Beauties: Very Large Telescope Takes Snapshots of Two Grand-Design Spiral Galaxies". European Southern Observatory. 1 Dec 2004. Archived from the original on 2008-10-02. Retrieved 6 Dec 2008.
  5. ^ Universe Today, Supernova in a Distant Galaxy NGC 6118, 24 Mar, 2012, by Fraser Cain
  6. ^ "Astro Photo Lab, The Blinking Galaxy". Archived from the original on 2016-08-15. Retrieved 2016-07-20.
  7. ^ a b Gowanlock, M. G.; Patton, D. R.; McConnell, S. M. (2011). "A Model of Habitability Within the Milky Way Galaxy". Astrobiology. 11 (9): 855–873. arXiv:1107.1286. Bibcode:2011AsBio..11..855G. doi:10.1089/ast.2010.0555. PMID 22059554. S2CID 851972.
  8. ^ Choi, Charles Q. (21 August 2015). "Giant Galaxies May Be Better Cradles for Habitable Planets". Space.com. Retrieved 24 August 2015.