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Figure 2. Fifteen-second exposure of Orion from Tucson, Arizona,
USA, using a Nikon 50mm f/1.4 lens on a Nikon D100 digital
camera set at ASA 1600. The brightest stars are labeled:
Betelgeuse (1), Bellatrix (2), Meissa (3,) Alnitak (4), Alnilam
(5), Mintaka (6), Rigel (7), and Saiph (8).
Table I – The Bright Stars of Orion
Common Name |
Bayer Letter |
Flamsteed Number |
SAO Number |
Spectral Type |
Magnitude (v) |
Luminosity vs the
Sun L0 and Temperature K |
Parallax in
millarcseconds** |
Distance in
parsecs |
Betelgeuse |
Alpha |
58 |
113271 |
M2Ib |
0.45 |
60,000 L0
3300K |
7.63 ± 1.64 |
131 |
Meissa |
Lambda |
39 |
112921 |
O |
3.39 |
65,000L0
35,000K |
3.09 ± 0.78 |
324 |
Bellatrix |
Gamma |
24 |
112740 |
B2III |
1.66 |
6400L0
21,500K |
13.42 ± 0.98 |
74.5 |
Alnitak |
Zeta |
50 |
132444 |
O9.5Ib |
1.74 |
100,000L0
31,000K |
3.99 ± 0.79 |
251 |
Alnilam |
Epsilon |
46 |
132346 |
B0Ia |
1.69 |
375,000L0
25,000K |
2.43 ± 0.91 |
410 |
Mintaka |
Delta |
34 |
132220 |
O9.511 |
2.25 |
70,000L0
30,000K |
3.56 ± 0.83 |
280 |
Saiph |
Kappa |
15 |
132542 |
B0.5iavar |
2.07 |
57,500L0
26,000K |
4.52 ± 0.77 |
221 |
Rigel |
Beta |
19 |
131907 |
B8Ia |
0.18 |
40,000 – 700,000L0
12,000K |
4.22 ± 0.81 |
237 |
Data derived from web links in Starry Night Backyard
(Copyright 2000, SPACE.com, Canada).
Stars
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