Harold Corwin

NGC 1509 = IC 2026. NGC 1509 was found independently by Swift and by Muller (who claimed two observations; he left us no sketch). Dreyer adopted Swift's position (which is 12 seconds of time too large) and description, though Muller's descriptive data certainly match what Swift recorded. (See NGC 1677 = NGC 1659 for more on other nebulae which Swift discovered on this night of 22 October 1886.)

Bigourdan tried to find the galaxy a few years later in December of 1890, but could not see anything at the NGC position ("Searched with care, but in vain"). His second observation seven years later was only slightly more successful: when his measurements are reduced, they point to a star east of the galaxy. However, he also saw the galaxy on that second night, and measured it, too. Supposing it to be new -- it is not at the NGC position, of course -- he listed it among his novae, so it received the IC number.

There is a fainter galaxy just to the west of NGC 1509 that is often taken as IC 2026. I'm not surprised that Bigourdan and Swift missed it; its magnitude is around V = 15, and it does not have a bright nucleus. However, Muller, working with the 26-inch at Leander McCormick, has picked up fainter galaxies. Perhaps he observed on poor nights, or perhaps he could only see high surface brightness objects with the long-focus refractor. He makes NGC 1509 only 0.1 arcmin in diameter, which means that he saw only its core.

Finally, the 1893 list of micrometrically measured nebulae from Leander McCormick includes a nebula claimed to be NGC 1509. Unfortunately, only the declination was measured, so the object cannot be unambiguously identified. However, even the measured declination does not agree with the accurate value from Bigourdan and the modern sources. This measurement probably refers to a star (the description given in the 1893 paper bears this out).

― NGC Notes by Harold Corwin

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