Nota M31

  1. ^ average(787 ± 18, 770 ± 40, 772 ± 44, 783 ± 25) = ((787 + 770 + 772 + 783) / 4) ± ((182 + 402 + 442 + 252)0.5 / 4) = 778 ± 17
  2. ^ Magnitud ketara of 4.36 - modulus jarak of 24.4 = −20.0
  3. ^ J00443799+4129236 is at celestial coordinates R.A. 00j 44m 37.99s, Dec. +41° 29′ 23.6″.
  4. ^ distance × tan( diameter_angle = 190′ ) = 141 ± 3 kly diameter