Astronomy:NGC 918

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NGC 918
NGC 918 by the Mount Lemmon SkyCenter
Observation data (J2000 epoch)
ConstellationAries
Right ascension 02h 25m 50.7648s[1]
Declination+18° 29′ 46.987″[1]
Redshift0.005037[1]
Helio radial velocity1510 ± 1 km/s[1]
Distance20.6±1.5 mpc [2]
Apparent magnitude (V)15.01[3]
Apparent magnitude (B)16.0[3]
Characteristics
TypeSAB(rs)c[1]
Size~70,500 ly (21.63 kpc) (estimated)[1]
Apparent size (V)3.5′ × 2.0′[1]
Other designations
IRAS 02230+1816, UGC 1888, MCG+03-07-011, PGC 9236[3][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 it has a broad line of neutral hydrogen. NGC 918 is also an active nucleus galaxy (AGN). Moreover, it is a field galaxy which 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.[2]

Supernovae

Two supernovae have been observed in NGC 918:

NGC 918 and dust clouds within our Milky Way with the 10th data release of the Legacy Survey.

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "NASA/IPAC Extragalactic Database". http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=6740&objname=22&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1#BasicData_0. 
  2. ↑ 2.0 2.1 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.
  3. ↑ 3.0 3.1 3.2 "NGC 918". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+918. 
  4. ↑ Seligman, Courtney. "New General Catalog Objects: NGC 900 - 949". https://cseligman.com/text/atlas/ngc32a.htm#3294. 
  5. ↑ "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=ngc+918&img_stamp=YES. 
  6. ↑ "NED Query Results for NGC 918". https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=NGC+918. 
  7. ↑ Nakano, S.; Itagaki, K.; Yusa, T. (2009). "Supernova 2009js in NGC 918". Central Bureau Electronic Telegrams (1969): 1. Bibcode: 2009CBET.1969....1N. http://www.cbat.eps.harvard.edu/iau/cbet/001900/CBET001969.txt. 
  8. ↑ "SN 2009js". IAU. https://www.wis-tns.org/object/2009js. 
  9. ↑ "APOD: 2009 November 12 - Art and Science in NGC 918". https://apod.nasa.gov/apod/ap091112.html. 
  10. ↑ 10.0 10.1 Gandhi, P.; Yamanaka, M.; Tanaka, M.; Nozawa, T.; Kawabata, K. S.; Saviane, I.; Maeda, K.; Moriya, T. J. et al. (2013). "SN 2009js at the Crossroads between Normal and Subluminous Type IIP Supernovae: Optical and Mid-infrared Evolution". The Astrophysical Journal 767 (2): 166. doi:10.1088/0004-637X/767/2/166. Bibcode: 2013ApJ...767..166G. https://ui.adsabs.harvard.edu/abs/2013ApJ...767..166G/abstract. 
  11. ↑ "Supernova 2009js in NGC 918". https://www.rochesterastronomy.org/sn2009/sn2009js.html. 
  12. ↑ Nakano, S.; Yamaoka, H.; Kadota, K.; Tsuboi, M.; Balam, D. D.; Graham, M. L.; Hsiao, E. Y.; Green, D. W. E. (2011). "Supernova 2011ek near NGC 918 = PSN J02254889+1832000". Central Bureau Electronic Telegrams (2783): 1. Bibcode: 2011CBET.2783....1N. https://ui.adsabs.harvard.edu/abs/2011CBET.2783....1N/abstract. 
  13. ↑ "SN 2011ek". IAU. https://www.wis-tns.org/object/2011ek. 
  14. ↑ "Supernova 2011ek in NGC 918". https://www.rochesterastronomy.org/sn2011/sn2011ek.html. 



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