Table A.1
Position measurements of HD 51756 AB.
| Date | θ(°) | ρ(″) | N | Methoda | Referenceb |
|
|
|||||
| 1875.06 | 90 | 1 | 1 | A | 1 |
| 1876.83 | 100.8 | 0.96 | 2 | A | D1883 |
| 1878.12 | 97.2 | n/a | 1 | A | 2 |
| 1881.05 | 96.1 | 0.75 | 1 | A | Bu1883 |
| 1888.10 | 95.8 | 0.73 | 2 | A | 3 |
| 1888.222 | 95.5 | 0.84 | 4 | B | 4 |
| 1892.08 | 95.8 | 0.79 | 3 | A | Bu1894 |
| 1894.40 | 98.1 | 0.64 | 5 | A | Sp1909 |
| 1899.01 | 93.6 | 0.59 | 1 | A | Bu1900 |
| 1902.544 | 93.9 | 0.68 | 6 | A | 5 |
| 1903.14 | 100.0 | 0.64 | 2 | A | 9 |
| 1906.16 | 95.9 | 0.87 | 3 | A | 6 |
| 1906.17 | 101.5 | 0.81 | 1 | A | Frm1907 |
| 1909.06 | 100.4 | 0.90 | 1 | A | 7 |
| 1909.06 | 101.3 | 0.88 | 1 | A | 7 |
| 1909.13 | 96.9 | 0.70 | 2 | A | Wz1912 |
| 1911.15 | 91.7 | 0.56 | 2 | A | 8 |
| 1920.09 | 98.1 | 0.77 | 1 | A | 10 |
| 1924.35 | 99.4 | 0.83 | 3 | A | 10 |
| 1924.79 | 97.5 | 0.94 | 1 | A | 10 |
| 1930.57 | 98.3 | 0.71 | 2 | A | Bon1938 |
| 1930.84 | 96.2 | 0.80 | 3 | A | 11 |
| 1935.43 | 102.0 | 0.78 | 4 | A | 12 |
| 1942.88 | 95.1 | 0.62 | 3 | A | 13 |
| 1945.31 | 103.6 | 0.68 | 2 | B | VBs1954 |
| 1947.17 | 102.8 | 0.76 | 2 | A | VBs1954 |
| 1953.22 | 98.5 | 0.81 | 6 | A | Rab1961b |
| 1956.11 | 98.2 | 0.74 | 2 | A | 14 |
| 1961.04 | 101.6 | 0.67 | 4 | A | 15 |
| 1965.034 | 100.1 | 0.69 | 4 | A | 16 |
| 1966.182 | 101.4 | 0.58 | 3 | A | 17 |
| 1968.045 | 101.4 | 0.66 | 3 | A | 18 |
| 1974.717 | 101.1 | 0.59 | 3 | A | 19c |
| 1975.522 | 101.6 | 0.55 | 3 | B | Wak1985 |
| 1991.25 | 102. | 0.71 | 1 | T | 20 |
| 1991.92 | 104.0 | 0.68 | 1 | T | 21 |
| 1994.129 | 101.2 | 0.67 | 1 | S | 22 |
| 1994.194 | 99.7 | 0.63 | 1 | S | 22 |
| 1994.194 | 100.5 | 0.68 | 1 | S | 22 |
| 1995.188 | 100.6 | 0.66 | 1 | S | 22 |
| 1995.199 | 103.0 | 0.68 | 1 | S | 22 |
| 1995.202 | 102.1 | 0.70 | 1 | S | 22 |
| 1995.202 | 101.8 | 0.67 | 1 | S | 22 |
| 1995.205 | 101.5 | 0.69 | 1 | S | 22 |
| 1995.207 | 101.9 | 0.63 | 1 | S | 22 |
| 1996.8960 | 101.5 | 0.695 | 1 | S | 23 |
| 1997.184 | 101.5 | 0.67 | 1 | S | 24 |
| 1997.184 | 102.2 | 0.69 | 1 | S | 24 |
Notes. . .
Methods of observations. A: Refractor, micrometer; B: Reflector, micrometer; T: Hipparcos or Tycho observation; S: Speckle interferometry.
For special references – which are not in the SAO/NASA Astrophysics Data System – see the References and discoverer codes of The Washington Double Star Catalog at http://ad.usno.navy.mil/wds/Webtextfiles/wdsnewref.txt
These observations were made after the closing of the cited article, but before the retirement of Alan Behall. Observing techniques, instrumentation and particulars are the same as described by Behall (1976)
References. (1) Burnham (1875); (2) Stone (1879); (3) Leavenworth & Beal (1930); (4) Tarrant (1890); (5) Doolittle (1905); (6) Olivier (1907); (7) Olivier et al. (1909); (8) Eddington et al. (1912); (9) Lewis et al. (1904); (10) Olivier (1928); (11) Olivier (1932); (12) Baize (1938); (13) Voûte (1955); (14) Worley (1957); (15) Worley (1963); (16) Walker (1966); (17) Walker (1969); (18) Worley (1972); (19) Behall (1976); (20) ESA (1997); (21) Fabricius et al. (2002); (22) Germain et al. (1999); (23) Horch et al. (2001); (24) Douglass et al. (1999).
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