The Striped Catfish Galaxy (C36-NGC 4559), which has an angular diameter of 11 ‘, is located at a distance of 7.3 Mpc.

The Striped Catfish Galaxy (C36-NGC 4559), which has an angular diameter of 11 ‘, is located at a distance of 7.3 Mpc. What are the linear dimensions of the galaxy?

Let us use the formula d = D * p, where D is the distance to the galaxy, p is its angular diameter, which must be expressed in radian measure, since the angle is small.
Then d = 7.3 * 11 * 60/206265 = 0.023 (Mpc); d = 23 (kpc).

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