In relation to the size of a galaxy, how do you convert arcminute into distance?

1 Answer
Mar 13, 2016

1 arc sec distance is 1 parsec = 206265 AU, nearly.
k arc minute distance = k X 60 parsec.


1 arc sec in radian measure is 4.48136811 E-06 radian. If the arc that subtends this angle at the observer is 1 AU long, the distance of the deep-sky object is defined as 1 parsec.

Use the circle formula R #theta# = arc length to understand this explanation. Here, #theta# is in radian measure.
So, 1 parsec = #1 / (4.48136811 E-06)# AU.