Dwarf Galaxy IC 1613

IC 1613
IC 1613: Dwarf galaxy in Cetus; TEC APO 140 FL Refraktor, f=882 mm; QHY 268M (CMOS); AstroPhysics 1200 GTO; L 1x1 26x600 sec, R 2x2 13x300 sec, G 2x2 11x300 sec, B 2x2 12x300 sec; Astrofarm Tivoli, Namibia; © September 2023 Hansjörg Wälchli [46]


In September 1906 German astronomer Max Wolf discovered the dwarf galaxy IC 1613 on a photo plate taken with the with the 16" Bruce reflector at Koenigstuhl Observatory, Heidelberg. William Baade first showed it was extragalactic in 1935 and a year later Hubble included it as a Local Group member. [277, 364]

Physical Properties

IC 1613 is an irregular dwarf galaxy and a member of our Local Group of galaxies, which also includes our Milky Way and the Magellanic Clouds. The distance is estimated to 2.4 million light-years. The galaxy contains some 100 million stars, among them several examples of Cepheid variables, standard cosmic distance calibrators. The majority of its stars were formed about 7 billion (109) years ago and it seems that currently there is no more star formation taking place, in contrary to other very active dwarf galaxies like the Large and Small Magellanic Clouds.

Through IC 1613 a background galaxy cluster is visible. In their center is a pair of giant elliptical galaxies, several hundred times further a away than IC 1613. [163] The 7.2 mag foreground star HD 6375 is of spectral type K4III and in a distance of 130 pc. [145]

Revised+Historic NGC/IC Version 22/9, © 2022 Dr. Wolfgang Steinicke [277]
Designation IC 1613
Type Gx (IBm)
Right Ascension (J2000.0) 01h 04m 47.5s
Declination (J2000.0) +02° 07' 07"
Diameter 16.6 × 14.9 arcmin
Photographic (blue) magnitude 9.9 mag
Visual magnitude 9.2 mag
Surface brightness 15.0 mag·arcmin-2
Position Angle 50°
Redshift (z) -0.000781
Metric Distance 0.740 Mpc
Dreyer Description F, eeL
Identification, Remarks UGC 668; MCG 0-3-70; DDO 8; CGCG 384-68; IRAS 01025+0153

Finder Chart

The dwarf galaxy IC 1613 is located in the constellation Cetus. The 7.2 mag star HD 6375 helps to find the faint galaxy, which is right south of it. The best observation time is September to December.

Finder Chart Dwarf Galaxy IC 1613
Dwarf Galaxy IC 1613 in constellation Cetus. Charts created using SkySafari 6 Pro and STScI Digitized Sky Survey. Limiting magnitudes: Constellation chart ~6.5 mag, DSS2 close-ups ~20 mag. [149, 160]

Objects Within a Radius of 15°