NGC 6118
Coordinates: 
16h 21m 48.6s, −02° 17′ 00″
16h 21m 48.6s, −02° 17′ 00″| NGC 6118 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Serpens |
| Right ascension | 16h 21m 48.6s[1] |
| Declination | −02° 17′ 00″[1] |
| Redshift | 0.005247 (1573 ± 1 km/s)[1] |
| Distance | 82.9 Mly (25.4 Mpc)[2] |
| Apparent magnitude (V) | 12.42[1] |
| Characteristics | |
| Type | SA(s)cd[1] |
| Size | 110,000 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
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
young stars can be perceived.[4]
Because NGC 6118 has loosely wound spiral open arms, no clear defined spiral arms like the
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]
Supernovae
cm Katzman Automatic Imaging Telescope (KAIT) in San Jose, CA.[9]
SN 2004dk was initially classified by
gravitationally stripped the outer layers of the progenitor star away, leaving only the heavier elements
. Type Ib supernovae have no hydrogen, while Type Ics have neither hydrogen or helium.
Over the following weeks
He I absorption lines, thus changing the classification of the supernova to Type Ib.[11]
SN 2020hvp (type Ib, mag. 18.2)[12] was discovered on 21 April 2020 by ATLAS.
See also
References
- ^ a b c d e f "NASA/IPAC Extragalactic Database". Results for NGC 6118. Retrieved 6 Dec 2008.
- ^
Conselice, C.J. (Nov 1997). "The Symmetry, Color, and Morphology of Galaxies". Publications of the Astronomical Society of the Pacific. 109: 1251–1255. S2CID 119348520.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 6118". Celestial Atlas. Retrieved 5 September 2024.
- ^ 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.
- ^ Universe Today, Supernova in a Distant Galaxy NGC 6118, 24 Mar, 2012, by Fraser Cain
- ^ "Astro Photo Lab, The Blinking Galaxy". Archived from the original on 2016-08-15. Retrieved 2016-07-20.
- ^ S2CID 851972.
- ^ Choi, Charles Q. (21 August 2015). "Giant Galaxies May Be Better Cradles for Habitable Planets". Space.com. Retrieved 24 August 2015.
- ^ "Supernova 2004dk in NGC 6118". IAU Circular. Smithsonian Astrophysical Observatory. 2 Aug 2004. Retrieved 2011-07-05.
- ^ "Supernova 2004dk in NGC 6118". IAU Circular. Smithsonian Astrophysical Observatory. 4 Aug 2004. Retrieved 2011-07-05.
- ^ "Supernovae 2004dk, 2004dw, 2004dy, AND 2004eg". IAU Circular. Smithsonian Astrophysical Observatory. 11 Sep 2004. Retrieved 2011-07-05.
- ^ "SN 2020hvp". Transient Name Server. IAU. Retrieved 5 September 2024.
External links
Media related to NGC 6118 at Wikimedia Commons
