Harold Corwin

IC 4683 may be nothing more than the rich Milky Way star field in this area. Wolf says only this about it: "The nebula M 8 and the large nebula covering more than 10 square grads [about 8 square degrees] found by me to the south (RA = 18.0h, Dec = -26.4 deg) ..." He has a footnote that the coordinates are for 1855.

There is no remarkable nebula in the area. This may also be nothing more than a large plate defect, too.

ESO has a curious note about this IC number: "Pos but not descr corresponds to an absorption region of elliptical shape." The position in ESO (18 05 12, -26 16.9) indeed corresponds to an absorption patch. But there is no indication in either the IC or Wolf's original article that there is any absorption associated with the IC object.

In any event, I've adopted Wolf's position for the main table. If his original plate still exists, it may be possible to find his object on it.

― IC Notes by Harold Corwin