... amounts to 19 sir./st. ( 90 km./sec.) in the direction towards the sun. The absolute magnitude of this star is 11m.7 and it is, with the exception of one other, the very faintest star now known. Its spectral type is Mb, a fact worth fixing in our memory, as different reasons favour the belief that it is precisely the M-type that contains the very faintest stars. Its apparent velocity (i.e., the proper motion) is so great that the star in 1000 years moves 3 deg., or as much ... — Lectures on Stellar Statistics • Carl Vilhelm Ludvig Charlier Read full book for free!