Table 2
Coordinates of the photometric measurement areas shown in Fig. 7 in the nebula of Betelgeuse, relatively to the star.
| Feature | Δα | Δδ | Radius | PA |
| (″) | (″) | (″) | (°) | |
|
|
||||
| A | −0.88 | 0.04 | 0.88 | 272 |
| B | −0.39 | −0.71 | 0.81 | 209 |
| C | −0.84 | 0.62 | 1.05 | 306 |
| D | 0.00 | 1.48 | 1.48 | 0 |
| E | −1.11 | 1.24 | 1.66 | 318 |
| F | 1.24 | 1.09 | 1.65 | 49 |
|
|
||||
| Shell arc center | 0.66 | 0.04 | 0.66 | 87 |
| Shell SE point | 0.84 | −0.47 | 0.97 | 119 |
| Shell NW point | 0.47 | 0.54 | 0.72 | 41 |
Notes. The position angle (PA) is counted positively from North to East (N = 0°, E = 90°). The last three lines list the positions of the center of the shell measurement window, and its south-eastern and north-western corners.
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