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NGC 6684 (15,366 of 18,816)


oc gc pln bn dn gx gxcl ast aka lost




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NGC 6684

NGC 6684, AM 1843-651, C 1846-652, ESO 104-16, GCl 102, LEDA 62453, SGC 184402-6513.8, h 3757, GC 4431

RA: 18h 48m 57.4s
Dec: −65° 10′ 26″

Con: Pavo
Ch: MSA:1520, U2:456, SA:26


(reference key)

Type: galaxy, SB...

Mag: B=11.35, V=10.45

Size: 4.168′ x 2.884′
PA: 35°

Historical observations

John Herschel (1847) Cape Observations

Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "B, R, psvmbM, 40 arcseconds, has a star 6-7 or 7m 5' or 6' N.p.." On a second occassion he called it "vB, R, first vg, then psmbM, 90 arcseconds, a star 6-7 m 7' S.p."

NGC/IC Dreyer (1888, 1895, 1908)

The NGC describes it as "very bright, pretty large, round, fades very gradually, pretty suddenly very much brighter in the middle with a 7th magnitude star to the west."

Published comments

Union Observatory Circular (c.1919)

Described in Union Obs. Circulars, 45-76, p 103. Based on examination of photographic plates: "Fine globular cluster. 10'' diameter. Seen also with the 9-inch in 1909 July. Is h 3757, 65'' diameter. B, R, mbM." The magnitude is estimated as 11. [odd comment about the size.]

de Vaucouleurs, G. (1956)

De Vaucouleurs (1956) "Survey of bright galaxies south of -35° declination", Mem. Mount Stromlo, No. 13. (photographic study, plates taken with the 30-inch Reynolds reflector, 20-inch diaphragm).

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 11.5 mag globular cluster.

Photo index

Photo Index by Jim Lucyk: Cat.of South.Peculiar Gal.and Ass. Vol 2 (Arp&Madore, 1987) p12.4.

Modern observations

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

Hartung describes this galaxy as round and symmetrical, about 45" across, rising sharply to an almost stellar nucleus. He notes that the "bright pale yellow Theta Pavonis is 6' Np and interferes with observation." The galaxy is best observed on nights of good seeing when high magnification can be used to place the interfering star outside the field of view.

ASV Journal (1971)

ASV Journal Vol 24 No 3 June 1971: "6' sf Theta Pav. Glimpsed in 4-inch."

Contemporary observations

Magda Streicher

1998 August 22

22 August 1998, Farm site, Meade 8" with a 18mm wide angle & 26mm Plossl, 36' fov, Sky Conditions: Clear 7 to 8 magnitude

Faint, round (3arc minutes), soft hazy glow, looks like a star out of focus, slowly brighter to a not so bright core. A few stars to the north west of the galaxy to keeps it company.

(no date)

16-inch f/10 SCT (127x, 290x)

Stringy cluster with faint stars flings out toward the east with a arrow shape pointing SW. Nice long elongated string starting off from the core and S out to the north, which is prominent. The western side is broken down with starlight. The cluster sports a splash of 11-12Magnitude stars.

2006 June 24


12-inch f/10 SCT (76x, 218x, 346x)

Conditions: Good

Easy seen as a round to oval haze, lowely brighten to a very dense cre but not star like. The edges is very milky and hazy. Three 10 Magnitude stars coming all the way from Theta and dotted around the galaxy in a half moon to the west of the galaxy. The galaxy is more or less 4' in a NE-SW direction. Just 5' south of Theta Pavo.

Favourite lists

Lacaille's catalogue

The Messier objects

Dunlop's catalogue

The Bennett objects

The Caldwell list

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