Gale discovered the planetary nebula IC 5150 in Grus with the 8.5" refractor at Sidney Observatory.His observation was confirmed by Pietro Baracchi (director of the Melbourne Observatory) with the 48" reflector, seeing a ring of 1.5' diameter with a non-empty inner part. The nebula was again found by Swift with the 16" refractor on Mt. Lowe, his #29 in MNRAS 59, 568 (1899). However, Dreyer included it as a different entry (IC 5148) in the IC II; see also: C. Hoffmeister, Die Sterne 37, 204 (1961).
| D | N | NI | Y | M | D | Ap | I | T | Con | Type | S | ID | Author | Title | Source |
| 1 | I | 5150 | 1894 | 6 | 4 | 8,5 | Rr | v | GRU | PN | 3 | IC 5148 (Swift L. 23.7.1897) | Gale, W. | New Double Stars and a Ring Nebula | AN [3426] 143, 293 (1897) |
Obituary: MNRAS 106, 29 (1946)
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