Galaxy
NGC 147
Dwarf spheroidal galaxy · C17 · NGC 147
Dwarf spheroidal galaxy in Cassiopeia
Photo: 2MASS/NASA/ESA · Public domain · Wikimedia Commons
NGC 147 is a dwarf spheroidal galaxy about 2.58 Mly away in the constellation Cassiopeia. NGC 147 is a member of the Local Group of galaxies and a satellite galaxy of the Andromeda Galaxy (M31). It forms a physical pair with the nearby galaxy NGC 185, another remote satellite of M31. It was discovered by John Herschel in September 1829. Visually it is both fainter and slightly larger than NGC 185. This means that NGC 147 is more difficult to see than NGC 185, which is visible in small telescopes. In the Webb Society Deep-Sky Observer's Handbook, the visual appearance of NGC 147 is described as follows: Large, quite faint, irregularly round; it brightens in the middle to a stellar nucleus.
Description from Wikipedia (CC BY-SA 4.0).
In your sky
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Key facts
Distance
~2.3 million light-years
Apparent mag.
+9.3
Apparent size
9.4′ × 5.4′
Best seen with
Telescope
Catalogue
C17 · NGC 147
Did you know
- Listed as Caldwell 17 in the Caldwell catalogue, also known as NGC 147.
- Found in the constellation Cassiopeia.
- Needs a telescope to see clearly.
