Internal Proper Motions
for M101, M33, M51 and M81
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The table above is a replica of Table III in van Maanen's 1921 article on
the internal motions in the spiral nebula Messier 81(MA21).
ReferencesMA21 - Maanen, Adriaan van, Investigations on Proper Motion - Fifth Paper: The Internal Motion in the Spiral Nebula Messier 81, Astrophysical Journal, 54, 347-356, (1921). - NADS |