Astronomy:IC 1657

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IC 1657 / IC 1663
File:IC 1657 legacy dr10.jpg
IC 1657 imaged by DESI Legacy Survey
Observation data
ConstellationSculptor
Right ascension 01h 14m 07.0s[1]
Declination−32° 39′ 03″[1]
Redshift0.011952 ± 0.000013[1]
Helio radial velocity3583±4 km/s[1]
Distance159 ± 11 Mly (48.6 ± 3.4 Mpc)[1]
Apparent magnitude (V)12.4[2]
Apparent magnitude (B)13.2[2]
Characteristics
Type(R')SB(s)bc; Sy2; H II[1]
Apparent size (V)2.40′ × 0.6′[2]
Notable featuresPosition angle: 170°;[2] galaxy group: LDCE 78[1]
Other designations
IRAS 1117-3254, IC 1657/1663, MCG-06-03-030, PGC 4440

IC 1657 (also known as IC 1663) is an active barred spiral galaxy with extended star-forming regions of the Hubble type SBbc in the constellation of Sculptor in the southern sky. It is estimated to be about 159 million light-years from the Milky Way and has a diameter of approximately 115,000 light-years.

In the same region of the sky lie, among others, the galaxies NGC 427, NGC 439, and NGC 441.

The object was discovered on 4 September 1897 by Lewis Swift.[3]

Supernovae

Two supernovae have been observed in IC 1657:

  • SN 2012hd (Type Ia, mag. 16.4) was discovered by Stu Parker on 20 November 2012.[4][5]
  • SN 2016gfk (Type Ia, mag. 17) was discovered by Stu Parker on 11 September 2016.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 NASA/IPAC Extragalactic Database
  2. ↑ 2.0 2.1 2.2 2.3 SEDS: IC 1657
  3. ↑ Seligman
  4. ↑ Pignata, G.; Bufano, F.; Gonzalez-Gaitan, S.; Marchi, S.; Forster, F.; Anderson, J.; Gutierrez, C.; Taubenberger, S. et al. (2012). "Supernova 2012hd in IC 1657 = PSN J01140746-3239077". Central Bureau Electronic Telegrams (3324): 1. Bibcode: 2012CBET.3324....1P. 
  5. ↑ "SN 2012hd". IAU. https://www.wis-tns.org/object/2012hd. 
  6. ↑ "SN 2016gfk". IAU. https://www.wis-tns.org/object/2016gfk. 



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