Overlaid DSS image of IC 4678, 30' x 30' with north at top and west to the right
|Type ||Bright Nebula|
|Size ||7.5' x 2.5' @ 120°|
|Right Ascension ||18h 6' 33.4" (2000)|
|Declination ||23° 57' 16" S|
This was found on a photographic plate taken by Barnard around the turn of the century, and described in his article in AN 4239. About it, he only says, "There is a small, elongated, bright nebula in the position 1860.0 17h 59m 25s+- -23d 53m+-." The +- signs are important since there is nothing at Barnard's position. However, about 1.5 minutes of time west of that position is a small nebula that matches Barnard's description.
As Barnard himself noted, it is clearly just a concentration in the general nebulosity of the area northeast of M8, but still stands out on blue-sensitive photos enough that it is unmistakably the object that Barnard was discussing. Other IC objects found by him on the same plate also have positions that are estimates, not real measurements. See NGC 6523, NGC 6526, NGC 6533, and IC 1271 for more discussion of the M8 area.
IC 4768 is two apparent clusters found by Bigourdan. He makes the entire grouping 30 arcmin in Dec by 15 arcmin in RA, with centers about 15 arcmin apart and oriented southwest-northeast. He notes the brightest stars as having magnitudes of 9.5 to 10, with the bulk of the stars in both clusters being "faint or very faint."
Finally, he labels the southwestern cluster "I" and the northeastern "II". I've adopted this notation for the position tables, where I give estimated positions from the DSS after having first located the clusters on the POSS1 prints.
23 objects found within 60'
Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.
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