Night of November 18-19, 2011
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CDK20

Sloan r filter

Gamma Arietis or Mesarthim


Double star at a distance of 160 light years


Two stars 

gamma-1  magnitude +4.83 spectral type B9
gamma-2  magnitude +4.75 spectral type A1p



gamma_ari_r_00183_df.fits
TARGET  = 'Gamma Ari'          / target
EXPTIME =                  0.1 / exposure time (seconds)
FILTER  = ' (2) r (530-700)  ' / filter
DATE-OBS= '2011-11-18T03:48:37' / date of observation (UT)