IC 1657 / IC 1663
IC 1657 imaged by DESI Legacy Survey
Observation data
Constellation	Sculptor
Right ascension	01h 14m 07.0s[1]
Declination	−32° 39′ 03″[1]
Redshift	0.011952 ± 0.000013[1]
Heliocentric radial velocity	3583±4 km/s[1]
Distance	159 ± 11 Mly (48.6 ± 3.4 Mpc)[1]
Apparent magnitude (V)	12.4[2]
Apparent magnitude (B)	13.2[2]
Surface brightness	12.6[2]
Characteristics
Type	(R')SB(s)bc; Sy2; H II[1]
Apparent size (V)	2.40′ × 0.6′[2]
Notable features	Position angle: 170°;[2] galaxy group: LDCE 78[1]
Other designations
IRAS 1117-3254, 2MASX J01140701-3239032, 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

External links

• SIMBAD Astronomical Database

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