sponsored by psychohistorian.org
RA: 18h 17m 4.9s
Dec: −19° 51′ 58″
Ch: MSA:1368, U2:339, SA:22
Ref: SIMBAD, Collinder (1931), DAML02, NGC/IC, [2003A&A...399..141M]
Type: reflection nebula
Mag: B=9.8, V=?
Size: 4′ x 3′
NGC 6590 = NGC 6595 = IC 4700. JH found the brightest nebula in this group while observing at Slough; his position is good. Swift came across it and another nearby nebula nearly 60 years later in 1885, but misplaced both by about 45 seconds of time in RA from the correct positions. In a note in AN 3101, Barnard corrected the positions for both of Swift's objects, noting the identity of N6590 with N6595. He also announced the discovery of another larger, though fainter nebula (I1284) northeast of the brighter pair. (In still another note in AN 3111, Barnard also announced the discovery of yet another nebula here, IC 1283. See that for more).
Curiously, Barnard mentions the AN 3111 note in AN 4239, but not the AN 3101 note. Had he done so, it might have alerted Dreyer to the identity of one of Barnard's nebulae mentioned there (see NGC 6589 for the passage) with N6595. Had this happened, Dreyer probably would not have been included it in the second IC.
Ced 157b (NGC 6590)
Position (1900): RA 18 11.1, Dec - 19 55
Star: -19 4946 (Mp=10.5, V=10.15, SpT=B6, B8)
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 with conspicuous structure (eg. IC 5146)
Notes: "157 b = NGC 6590 = NGC 6595 = IC 4700 = GC 4395 = h 2002. (49, 51, 85, 93 Pl 29 Pl 31, 114, 194, 216, 366, 428, 578, 715, 733). R. Regarding the identification, see Barnard (49)."
= NGC 6590, Ced 157b
Pos (1950.0) 18:14.0, −19:54
Size: 4x3 (blue), 3x3 (red).
Beverly Lynds (Astrophysical Journal Supplement, No 105, 1965) in her Catalogue of Bright Nebulae notes that this nebula is bright, more prominent on the blue POSS plate and has a maximum size of 4' x 3'.
Identical with NGC 6595 as pointed out by Barnard (A.N. 3101)
The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula.
= DG 150, [RK68] 89, VdB 119, N6590, GN 18.14.1, Ced 157b, Other designations: Sh37
Class: C+E (emission and reflection neb)
Comments: 2 stars
Observing site: Little Bennett Regional Park
[18h 17m 0s, -19° 53' 0"] A triple star surrounded by a faint haze.
The Messier objects
The Bennett objects
The Caldwell list
DOCdb is still in beta-release.
Known issues, feature requests, and updates on bug fixes, are here:
Found a bug? Have a comment or suggestion to improve DOCdb? Please let us know!
DOCdb is a free online resource that exists to promote deep sky observing.
You could help by sharing your observations, writing an article, digitizing and proof-reading historical material, and more.
Everything on DOCdb.net is © 2004-2010 by Auke Slotegraaf, unless stated otherwise or if you can prove you have divine permission to use it. Before using material published here, please consult the Creative Commons Attribution-Non-Commercial-Share Alike 2.5 License. Some material on DOCdb is copyright the individual authors. If in doubt, don't reproduce. And that goes for having children, too. Please note that the recommended browser for DOCdb is Firefox 3.x. You may also get good results with K-Meleon. Good luck if you're using IE. A successful experience with other browsers, including Opera and Safari, may vary.