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RA: 18h 06m 33s
Dec: −23° 56′ 49″
Ch: MSA:1392, U2:339, SA:22
Ref: [2003A&A...399..141M], SIMBAD
Type: reflection nebula
Mag: B=?, V=?
IC 4678. 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.
Ced 152b (IC 4678)
Position (1900): RA 18 1.9, Dec - 23 53
Star: -23 13906 (Mp=10.4, V=10.2, SpT=B6)
Spectrum of nebula: continuous spectrum (inferred from sp.t. of illuminating star)
Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope without conspicuous structure (eg. lambda Scorpii)
Notes: "152 b = IC 4678 = -23 13906 nebulous. Disc. Barnard 1908 (85). FA 62. WP 92. (93 Pl 29 Pl 30, 366, 715. R. The star -23 13908 = HD 165345 projects against the nebula. The HD spectrum of this star is given to be K0, whereas Seares and Hubble (064) have B3."
= [RK68] 83, IC4678, GN 18.03.5, Ced 152b
Class: C (reflection neb)
The Messier objects
The Bennett objects
The Caldwell list
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