Catalogue of double stars from observations made at the Royal Observatory, Greenwich, with the 28-inch refractor during the years 1893-1919 (1921)
Royal Observatory, Greenwich, Dyson, Frank Watson, 1868-1939 · London, H. M. Stationery Off. · leaf 228
3" 29m 59S. Mags. 6-6, 67. P, o''-o32 in i^6°-6 (Boss). Dec. +24° 13'. Spec. A2. This star is 7 Tauri. The orbit has been deduced by Zwiers' method from observations beginning with Struve in 1828 and ending with the Greenwich observations in 1913. In that interval about 140° were described, while… … a period of 270 years, as compared with 217 years given below, while the semi-major axis of o''-49 is correspondingly larger. The elements can only be considered provisional. T 1919-37 a 0-407 t 37-0 n 106-5 P 216-9 years e 0-545 n —1°-66 o) 350-0
Double stars
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