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Table 1
Properties of the spots observed at the surface of Betelgeuse during the Hipparcos mission.
| Spot 1 | Spot 2 | Photocentre | ||||||
| pos. offset | pos. angle | flux fraction | pos. offset | pos. angle | flux fraction | pos. offset | pos. angle | |
| [mas] | [°] | % | [mas] | [°] | % | [mas] | [°] | |
|
|
||||||||
| January 1991 | 9 ± 2 | 105 ± 3 | 12 ± 2 | 9 ± 2 | 305 ± 4 | 11 ± 2 | 0.4 | 39 |
| January 1992 | 2 ± 1 | 40 ± 10 | 17 ± 2 | 29 ± 3 | –45 ± 5 | 4 ± 1 | 1.2 | –29 |
Notes. The position offset refers to the centre of the extended disc, of radius 27 mas (Jan. 1991) and 23 mas (Jan. 1992). Data from Wilson et al. (1992); Tuthill et al. (1997).
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