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RA: 17h 24m 18s
Dec: −34° 20′ 0″
Ch: MSA:1439, U2:376, SA:22
Ref: SIMBAD, DAML02
Type: bright nebula (HII region)
Mag: B=?, V=?
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Innes, in Union Obs. Circ., 45-76, p 3, notes: "... The following nebulae and a cluster were incidentally noted on the [Franklin-Adams] plates of 1916 July 3 and 4: .... NGC 6357 = h 3682. 1875. RA 17h 16.5m, Dec -34° 4'. Small crescent shaped nebula partly around an 11th magnitude star."
F, 4' long, irr.nebula, mE 90deg approx; a line of structureless nebulosity, looped around two small stars at p.end. There are indications of fainter outlying nebulosity, and possibly absorption to the south.
Red nebulae in the tail of Scorpio. Publ. A.A.S., 10, 48.
Ced 142 (NGC 6357)
Position (1900): RA 17 18.1, Dec - 34 6
Star: -34 11671 (Mp=10.0, V=10. :)
Spectrum of nebula: emission spectrum (observed)
Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope without conspicuous structure (eg. lambda Scorpii)
Notes: "NGC 6357 = GC 4297 = h 3682. Disc. 1837. (93 Pl 22, 243, 297, 365)."
Lindsay, E. M. () "NGC 6334, NGC 6357 and surrounding regions", IAJ, vol 3, p 182.
The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula.
Photo Index by Jim Lucyk: Vehrenberg's Atlas of DS Splendors (3ed) p179.
Steve Coe, observing with a 17.5" f/4.5 at 100X, notes: "Pretty bright, pretty small and elongated E-W 3' X 1' at 100X. That is without the UHC filter, adding the nebula filter brings out many faint filaments of nebulosity that extend beyond the 30' field in all directions. I counted 28 stars involved.
16-inch f/10 SCT (127x, 290x)
The dark area is quite evedent and seen with ease with a nebular filter in place. The centre contains a few faint stars 13Magnitude in a short string from N-S. Pismis 24 is situated towards the SE of this nebula. A double stars can be seen towards the middle and a 7Magnitude star is the brightest star in the area.
The Messier objects
The Bennett objects
The Caldwell list
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