Andrew Cooper
Nov 13, 2020    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x
Seeing: 5 Transparency: 6 Moon: 0%

Σ 239 is a pretty binary, the 7th magnitude DL Tri, a yellow with the 8th magnitude SAO 75264, a rich yellow easily visible 14" southwest, 10 Tri is 21' southeast

Captain William Henry Smyth
Dec 2, 1834    No. 6 The Crescent, Bedford, England (map)
150mm f/17.6 refractor by Tully 1827

A fine double star [DL Tri and SAO 75264], between the Ram and the Triangle, where it will be found by shooting a line from α Andromedæ through α Trianguli, and extending it nearly 5° beyond: it is also near the mid-distance between γ Andromedæ and γ Ceti. A 8½, and B 9, both silvery white. This object, formed by Piazzi's Nos. 38 and 39, was classed H IV 40, in 1781; no measures of position were then taken, but the distance was found to be 17".31, "pretty accurate." H. and S. found it thus:

    Pos. 208°56'  Dist. 14".35  Ep. 1821.96
       [ 212°           14".00      2019 WDS ]

which is too similar to the result given by my measures thirteen years afterwards, to confirm the retrograde motion inferred from a reduction of Piazzi's mean places for 1800, which give 211°.5 for the angle, and 16".8 as the distance.

― A Cycle of Celestial Objects Vol II, The Bedford Catalogue, William Henry Smyth, 1844

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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