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Table 1
Longitude ψ of the center of the prime-pole bright phase, based on n1 and n2 measurements of the beginning and end phases of the bright-pole visibility interval, φ1 and φ2, respectively, in five observing seasons.
| Observing | Mean JD | n1 | φ1 | n2 | φ2 | ψ |
| season | 2 450 000+ | (degree) | ||||
|
|
||||||
| (a) Individual observing seasons | ||||||
| 2009 | 54941.7 | 13 | –0.359(8 ) | 17 | 0.187(6) | 30.9 ± 1.7 |
| 2009/10 | 55200.4 | 16 | –0.357(5) | 14 | 0.191(3) | 30.0 ± 1.1 |
| 2010/11 | 55624.7 | 13 | –0.356(9) | 12 | 0.189(4) | 29.9 ± 1.7 |
| 2011/12 | 55932.6 | 14 | –0.368(8) | 11 | 0.188(6) | 32.3 ± 1.7 |
| 2013 | 56333.6 | 8 | –0.367(12) | 3 | 0.189(12) | 32.1 ± 3.0 |
| (b) All data combined | ||||||
| 2009–2013 | 55478.2 | 64 | –0.361(9) | 57 | 0.189(5) | 31.0 ± 1.9 |
Notes. Phase errors quoted in parentheses refer to the last digits.
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