艾米

艾米與一些天體的比較

艾米（Exametre，符號Em）是一个长度单位。1 Em＝1018米。

可以用艾米计量的距离

參考資料
  1. distance × sin( diameter_angle ), using distance of 5kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.
  2. van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. . Astronomy and Astrophysics. January II 2006, 445 (2): 513–543. Bibcode:2006A&A...445..513V. doi:10.1051/0004-6361:20053061. best-fit dynamical distance D=4.8±0.3 kpc ... consistent with the canonical value 5.0±0.2 kpc obtained by photometric methods
  3. Harper, Graham M.; Brown, Alexander; Guinan, Edward F. (PDF). The Astronomical Journal. April 2008, 135 (4): 1430–40. Bibcode:2008AJ....135.1430H. doi:10.1088/0004-6256/135/4/1430.


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