Andrew Cooper
Jul 21, 2023    Oregon Star Party, Ochoco Mts, OR (map)
25cm f/4.5 Newtonian, Holoholo @ 71x
Seeing: 7 Transparency: 6 Moon: 0%

Faint, 2' x 1' extended north-south, no notable core

Harold Corwin

NGC 6690 = NGC 6689. Both Swift and d'A found this galaxy twice. D'A, however, realized that his two observations referred to the same object, while Swift's second position was far enough off to mislead him into including the galaxy twice in his fifth list. Dreyer somehow recognized Swift's mistake, so only included one of the entries in NGC -- but he (Dreyer) also missed the identity with d'A's object, even though the two positions are less than an arcminute apart on the sky.

Whatever happened, there is certainly only one galaxy, and it clearly bears two NGC numbers. The several descriptions are good, and all the nearby field stars are just where d'A and Swift put them in their notes.

― NGC Notes by Harold Corwin

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

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