Physical parameters of M 51 = NGC 5194.
|Position of the nucleus|
|δ(2000) = +47°11′42.59′′|
|Position angle of major axis||−10° (0° is north)|
|Inclination||−20° (0° is face on) a|
|Optical radius (R25)||3.9′ (8.6 kpc)c|
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