艾米 (單位)
長度單位
艾米（Exametre，符號Em）是一個長度單位。1 Em＝1018米。
可以用艾米計量的距離
參考資料
- ^ distance × sin( diameter_angle ), using distance of 5kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.
- ^ van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. The dynamical distance and intrinsic structure of the globular cluster ω Centauri. 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
- ^ Harper, Graham M.; Brown, Alexander; Guinan, Edward F. A New VLA-Hipparcos Distance to Betelgeuse and its Implications (PDF). The Astronomical Journal. April 2008, 135 (4): 1430–40 [2012-03-10]. Bibcode:2008AJ....135.1430H. doi:10.1088/0004-6256/135/4/1430. （原始內容存檔 (PDF)於2011-07-15）.