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NGC 6729 (15,522 of 18,816)

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R CrA Nebula

NGC 6729, Bernes 159, Ced 165c, Magakian 784, Parsamian 2, Caldwell 68, R CrA Nebula, GC 5937

RA: 19h 01m 54.08s
Dec: −36° 57′ 11.1″

Con: Corona Australis
Ch: MSA:1434, U2:379, SA:22

Ref: SIMBAD, [2003A&A...399..141M], Corwin (2004)

(reference key)

Type: reflection nebula

Mag: B=?, V=?

Size: ?
PA: ?

Image gallery

Photos  (2)

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Published comments

Innes, R.T.A. (1910)

Region around S Corona Austrina. Transvaal Observatory Circular, No 5, 57.

[1910TvlCi...5...57I]

Helwan Obs. Bulletin No 9 (1912)

[see also NGC 6723]

Innes, R.T.A. (1916)

The variable stars and nebulae near R Corona Australe. Union Obs. Circ. No.36, 282-284.

[1916CiUO...36..282I]

Cederblad, S. (1946)

Catalogue of bright diffuse galactic nebulae.

Ced 165c

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a diffuse nebula.

Cederblad, S. (1946) [VII/231]

Ced 165c (NGC 6729)

Position (1900): RA 18 55.2, Dec - 37 5

Star: R Cor Austr (variable Mp and V, SpT=Gpe)

Spectrum of nebula: continuous and emission spectrum (observed)

Classification: Neb associated with mainly one star (which may be multiple) - star surrounded by a neb envelope with conspicuous structure (eg. IC 5146)

Size: variable

Notes: "165 c = NGC 6729 = GC 5937 = The variable nebula connected with R Corona Austrina = e. Disc. Schmidt 1861. (217, 271, 366, 375, 386, 429, 430, 432, 433, 450, 482, 486, 579, 690, 693, 832)."

Bernes, C. (1977)

Bernes, C. (1977) A catalogue of bright nebulosities in opaque dust clouds.

= Bernes 159

Bernes notes in his Catalogue of Bright Nebulosities in Opaque Dust Clouds that this object is also known as Cederblad 165c. He defines it as a combination emissionreflection nebula, 1' across, and part of the R CrA complex. Sanford writes: "the cometlike nebula NGC 6729 [has] the variable star R CrA in its 'nucleus' and also follows the erratic changes of brightness of the star."

Magakian T. Yu. (2003)

= Bernes 159, N6729, GN 18.58.5, Ced 165c, Other designations: R CrA

Class: CN (cometary nebula)

Photo index

by Jim Lucyk: Sky&Tel. 8/62 p69, Sky&Tel. 9/83 p277, Astronomy mag. 7/86 p94, Burnhams V2 p696.

Modern observations

Clarke, W.P. (1992)

(1992, Webb Society Quarterly Journal, 89, 1-7, 'A Visual Survey of the Complex Field Around R CrA & TY CrA') writes "Found in the same field as NGC 6726-7, this is a distinctly comet-like object with its tail extended in PA 140 degrees. It is over one minute in length with a major:minor axis ratio of about 6:1. There is a 12th mag star (T CrA) at the SE corner of the tail. The variable R CrA, which lies at the head of the comet, was not visible in either the 25cm or 53cm telescopes. The object vanishes when an O III filter is employed. ... The variable stars R CrA and T CrA are Orion-type nebular variables of irregular period; R CrA varies over the range 10.0 - 14.4 (B) and T CrA over the range 11.7-14.3 (V). As illuminating stars of the reflection nebula NGC 6729, they cause the nebula itself to vary in brightness and form, not unlike Hubble's Variable Nebula (NGC 2261) in Monoceros."

Hartung, E.J. (1968) Astron.Obj.South.Tel

Notes: "This field lacks the faint starry background of neighbouring regions and appears to be obscured by diffuse nebulous material rendered luminous near immersed stars, as shown by this object which is a rather faint comet-like hazy ellipse about 1.5' long with the small star R CrA near the np apex . . surrounded by similar luminous haze are the two fairly bright stars preceding (NGC 6726 and NGC 6727) and about 15' sp is a fine equal pair also immersed in haze (IC 4812)."

Steve Coe

Coe, using a 13" f/5.6, notes: "Pretty bright, pretty small, comet shaped nebula with a 12th mag star in the tip at 135X. There is a faint star on the south side. The UHC filter dims this object quite a bit, it must be a reflection nebula."

Contemporary observations

Richard Ford

2009 July,18 Saturday

Location:Perdeberg.

Instrument:12"Dobsonian Reflector Telescope.

Sky Conditions:The fainter parts of the Milky Way are barely visible.

Transparency of the Sky:Haziness only visible on the horizon.

Seeing:Atmosphere stable with little interference.

Limiting Magnitude:4.9.

First Impression:Nebula.

Location:Corona Australis.

Time:19:50pm.

Chart Number:No.19(Extract taken out of "Atlas of the Night Sky").

Brightness:Faint.

Brightness Profile:Low Surface Brightness.

Challenge Rating:Easy to observe in dark skies in a 12-16 telescope.

Overall Shape:Irregular.

Are there areas of uneven brightness? No,there are no areas of uneven brightness,but there are areas of even brightness around the two stars.Around the two stars nebulosity is discerned.It is somewhat a reflection nebula.

Are darker lanes/patches? No,there are no dark lanes.

Any structure visible? No.

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