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Table A.2
Separations and position angles of the G0V companion of π1 Gru, from the Washington Double Star Observations catalogue (courtesy of B. Mason).
| Obs. Epoch | PA | d | Reference | |||
| (yr) | (°) | (″) | ||||
|
|
||||||
| 1896.8 | 190 | 2.5 | Innes (1897) | |||
| 1900.75 | 201.6 | 3.04 | Innes (1905) | |||
| 1900.76 | 201.4 | 2.70 | Lunt (1908) | |||
| 1912.63 | 201.4 | 2.27 | Innes (1914) | |||
| 1926.02 | 200.6 | 2.74 | van den Bos (1928) | |||
| 1929.02 | 200.4 | 2.78 | Rossiter (1955) | |||
| 1936.74 | 201.2 | 2.75 | van den Bos (1938) | |||
| 1943.49 | 202.1 | 2.71 | Voûte (1955) | |||
| 1956.446 | 200.83 | 2.831 | The (1975) | |||
| 1960.80 | 202.8 | 2.63 | van den Bos (1961) | |||
| 1966.81 | 201.0 | 2.82 | Knipe (1969) | |||
| 1975.722 | 201.0 | 2.79 | Worley (1978) | |||
| 1989.86 | 200.4 | 2.45 | Sahai (1992) | |||
| 2003.47 | 203.1 | 2.82 | HST (PI: Sahai) | |||
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