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Caldwell 17 (NGC 147)
Jonathan Chong

Caldwell 17 (NGC 147)

NGC 147 is a dwarf elliptical galaxy. It was discovered by John Herschel on September 8, 1829. This object is very faint, very large, irregularly round, gradually suddenly much brighter middle, star of 11th mag nearby. This galaxy is 2400 kly (kilolightyears) away from the earth. NGC 147 is found in the Cassiopeia constellation.

When looking at NGC 147, you see a huge cluster of faint stars. In comparison to other galaxies, this galaxy is fairly small. The reason why it is so small is because it was born a small galaxy and nothing ever happened to the galaxy as time passed. This galaxy is also very low in density. The distance to this object is estimated to be 2400 kly (seds.org); we find a maximum angular size of 197.8 arcminutes, which corresponds to a linear size of 10,500 ly.

References:

Walter Baade, 1944. NGC 147 and NGC 185, Two New Members of the Local Group of Galaxies. Astrophysical Journal, Vol. 100, p. 147-150. <http://spider.seds.org/spider/LG/n0147.html>.

Sidney van den Bergh. The Binary Galaxies NGC 147 and NGC 185. <http://spider.seds.org/spider/LG/n0147.html>

Right Ascension (J2000) 33:11:70
Declination (J2000) -48:30:26
Filters used B (Blue), C (Clear), R (Red), V (Green)
Exposure time per filter C, B, V, and R (60s)
Date observed October 26, 2012

 

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