Andrew Cooper
Aug 6, 2021    Waikoloa, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 95x
Seeing: 5 Transparency: 6 Moon: 0%

Faint, round, 2' in diameter, distinct with well defined boundaries, no central star noted, no color or structure noted

Andrew Cooper
Sep 10, 2020    Waikoloa, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 76x
Seeing: 6 Transparency: 7 Moon: 0%

Quite faint, round, large at 2' in diameter, just visible with averted vision, no color noted, no central star noted

Harold Corwin

IC 5148 = IC 5150. Found first by W. Gale in June of 1894, it was correctly described by him (in AN 3426) as a "... ring nebula, almost circular, 1.5'+- in diameter; the center is not completely free of nebulosity." He credits the description to "Mr. Baracchi, Director of the Melbourne Observatory," who examined the object with the 48-inch Melbourne reflector, then one of the largest telescopes in the world.

Swift rediscovered the planetary in July of 1897, and correctly described its location relative to two nearby stars, one of which is just off the edge of the annulus to the south-west. So, there is no doubt that the two numbers refer to the same object.

Swift's position is, as usual, not particularly good, and neither is Gale's. In spite of its large quoted standard deviation, the GSC position is very close to the central star.

― IC Notes by Harold Corwin

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

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