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Table 2
Previously published prime-pole spot longitudes ψ.
| Year | Mean JD | Band | ψ | Reference |
| 2 450 000+ | (degree) | |||
|
|
||||
| 1979 | 44214.62 | X | −22.0 ± 11.0 | Biermann et al. (1985) |
| 1982 | 44993.96 | Opt | −14.0 ± 7.0 | |
| 1984 | 45763.83 | Opt | −14.0 ± 4.0 | |
| 1984 | 45854.88 | X | −12.0 ± 7.0 | Robinson & Córdova (1984) |
| 1985 | 46054.94 | X | −11.0 ± 7.0 | |
| 1991 | 48560.56 | FUV | 3.0 ± 4.0 | Stockman et al. (1994) |
| 1992 | 48686.50 | Opt | 4.0 ± 3.0 | Bailey et al. (1993) |
| 1992 | 48773.22 | X | 2.2 ± 2.2 | Schwope et al. (2002) |
| 1993 | 49144.09 | X | 4.7 ± 2.2 | |
| 2000 | 51870.84 | X | 24.1 ± 2.2 | |
| 2000 | 51870.84 | X | 25.0 ± 1.0 | Pandel et al. (2002) |
| 2002 | 52284.70 | Opt | 26.6 ± 3.0 | Schwope et al. (2002) |
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