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 237
216 Orbits of 25 Double Stabs. OS 285. 7001. B.D. 42,° 2531. E.A. 1411 42m 40S. Mags. 7'I, 7-6. P.M. "-048 in 170°-5 (Greenwich). * Dec. +42° 41'. Spec. Fs- Par. Abs. Trig. —"-022 (Sproul). Spec. '-012. This double star has described the greater part of a revolution since 1843, when it was first… … agreement is considered to be sufficiently close. All the observations after 1883 are well represented. The arc covered by the observations from 1843 to 1917 is nearly 340°, so that the elements must be fairly accurate. The uncertainty is mostly due to personality in the observations, for at the…
Double stars
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