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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. . .

(a)

Methods of observations. A: Refractor, micrometer; B: Reflector, micrometer; T: Hipparcos or Tycho observation; S: Speckle interferometry.

(b)

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

(c)

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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