Harold Corwin

IC 2099 is not NGC 1677 as I had supposed fifteen years ago when I went over this field for SEGC. See NGC 1677 = NGC 1659 for that story, and see IC 2091 for more on Roberts's photograph of the NGC 1665 field.

― IC Notes by Harold Corwin

Harold Corwin

IC 2100 is a double star found by Bigourdan and later picked up on Roberts's plate of the NGC 1665 field (see I2091 for more about that). Roberts's and Bigourdan's descriptions are more or less accordant:

Roberts: Bigourdan 380 is shown on the photograph as a pretty bright stellar nucleus surrounded by nebulosity elongated in sf to np direction.

Bigourdan: Pretty stellar object, a little nebulous, granulated, round and about 12 arcsec in diameter.

Roberts gives no coordinates, but the double star is in fact oriented as he states. Bigourdan has four measurements on the night he found the double, 17 December 1897, and they point unmistakably at the double.

― 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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