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NGC 309

Coordinates: Sky map 00h 56m 42.653s, −09° 54′ 49.883″
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NGC 309
SDSS image of NGC 309
Observation data (J2000 epoch)
ConstellationCetus
Right ascension00h 56m 42.653s[1]
Declination−09° 54′ 49.883″[1]
Redshift0.018883[1]
Heliocentric radial velocity5661 ± 2 km/s[1]
Distance87.99 ± 10.45 Mly (26.978 ± 3.205 Mpc)[1]
Apparent magnitude (V)13.4g[1]
Characteristics
TypeSAB(r)c[1]
Size~80,900 ly (24.81 kpc) (estimated)[1]
Apparent size (V)1.94′ × 1.34′[1]
Other designations
HOLM 027A, IRAS 00542-1010, 2MASX J00564266-0954500, MCG -02-03-050, PGC 3377[1]

NGC 309 is a spiral galaxy in the constellation Cetus. Its velocity with respect to the cosmic microwave background is 5343 ± 22 km/s, which corresponds to a Hubble distance of 257.0 ± 18.0 Mly (78.81 ± 5.53 Mpc).[1] However, nine non-redshift measurements give a much closer distance of 87.99 ± 10.45 Mly (26.978 ± 3.205 Mpc).[2] It was discovered in 1876 by Wilhelm Tempel.[3]

NGC 309 and NGC 309A are listed together as Holm 27 in Erik Holmberg's A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems, published in 1937.[4]

Supernovae

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Five supernovae have been observed in NGC 309.

Supernovae in NGC 309
Supernova apmag type Discovery date
1999ge[5] 15.5 II 27 November 1999
2008cx[6] 17.8 IIb 5 June 2008
2012dt[7] 18.0 IIP 17 July 2012
PSN J00564446-0954595[8] 17.2 IIb 10 June 2013
2014ef[9][10] 17.3 Ib 13 December 2014

See also

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References

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  1. ^ a b c d e f g h i j k "NASA/IPAC Extragalactic Database". Results for NGC 0309. Retrieved September 2, 2016.
  2. ^ "Distance Results for NGC 309". NASA/IPAC EXTRAGALACTIC DATABASE. NASA. Retrieved November 22, 2024.
  3. ^ "New General Catalog Objects: NGC 300 - 349". Cseligman. Retrieved October 20, 2016.
  4. ^ Holmberg, Erik (1937). "A Study of Double and Multiple Galaxies Together with Inquiries into some General Metagalactic Problems". Annals of the Observatory of Lund. 6: 1. Bibcode:1937AnLun...6....1H.
  5. ^ "SN 1999ge". Transient Name Server. IAU. Retrieved November 22, 2024.
  6. ^ "SN 2008cx". Transient Name Server. IAU. Retrieved November 22, 2024.
  7. ^ "SN 2012dt". Transient Name Server. IAU. Retrieved November 22, 2024.
  8. ^ Fox, Derek (June 17, 2013). "FIRE Classification of Supernova in NGC 309". The Astronomer's Telegram. Retrieved November 22, 2024.
  9. ^ 2014ef in NGC 309 (David Bishop)
  10. ^ "SN 2014ef". Transient Name Server. IAU. Retrieved November 22, 2024.
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  • Media related to NGC 309 at Wikimedia Commons