NGC 918
| NGC 918 | |
|---|---|
 NGC 918 by the Mount Lemmon SkyCenter | |
| Observation data (J2000 epoch) | |
| Constellation | Aries |
| Right ascension | 02h 25m 50s[1] |
| Declination | +18° 29′ 46″[1] |
| Redshift | 0.005027[2] |
| Heliocentric radial velocity | 1507 ± 3 km/s[2] |
| Apparent magnitude (V) | 15.01[1] |
| Apparent magnitude (B) | 16.0[1] |
| Characteristics | |
| Type | SAB(rs)c[2] |
| Other designations | |
| NGC 918,MCG+03-07-011, LEDA 9236[1] | |
NGC 918 is a barred spiral galaxy in the constellation Aries about 67 million light years from the Milky Way. It was discovered by John Herschel on Jan 11, 1831.[4]
The brightness class of NGC 918 is III and has a broad HI line. NGC 918 is also an active nucleus galaxy (AGN). Moreover, it is a galaxy of the field , that is to say, it does not belong to a cluster or group and is therefore gravitationally isolated.[5]
Many non-redshift measures give a distance of 19,115 ± 6,160 Mpc (~62,3 million ly)[6] , which is within the distances calculated using the value shift.[3]
Supernova 2009
Supernova SN 2009js was discovered in this galaxy October 11, 2009 at 17.2 magnitude.[7][8][9][10]
Supernova 2011
Supernova SN 2011ek was discovered on Aug. 4, 2011 by Koichi Itagaki at 16.4 magnitude.[11][12]
See also
References
- ^ a b c d e "NGC 918". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 June 2019.
- ^ a b c "NASA/IPAC Extragalactic Database". ned.ipac.caltech.edu. Retrieved 19 June 2019.
- ^ a b We obtain the distance that separates us from a galaxy using Hubble's law: v = Hod, where Ho is the Hubble constant (70 ± 5 (km / s) / Mpc). The relative uncertainty Δd / d over the distance is equal to the sum of the relative uncertainties of the velocity and Ho.
- ^ Seligman, Courtney. "New General Catalog Objects: NGC 900 - 949". New General Catalog Objects: NGC 900 - 949. Retrieved 19 June 2019.
- ^ http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=ngc+918&img_stamp=YES
- ^ https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+918
- ^ http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=ngc+918&img_stamp=YES
- ^ https://apod.nasa.gov/apod/ap091112.html
- ^ SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution, The Astrophysical Journal, Volume 767, Issue 2, article id. 166, 15 pp. (2013).
- ^ http://www.rochesterastronomy.org/sn2009/sn2009js.html
- ^ https://ui.adsabs.harvard.edu/abs/2011CBET.2783....1N/abstract
- ^ http://www.rochesterastronomy.org/sn2011/sn2011ek.html
External links
Media related to NGC 918 at Wikimedia Commons- NGC 918 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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