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NGC 6426 (14,659 of 18,816)

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NGC 6426

NGC 6426, Cl Collinder 346, C 1742+031, GCl 76, II 587, GC 4325, GC 5870

RA: 17h 44m 54.71s
Dec: +03° 10′ 12.5″

Con: Ophiuchus
Ch: MSA:1273, U2:248, SA:15

Ref: SIMBAD, Collinder (1931), SEDS

(reference key)

Type: globular cluster

Mag: B=?, V=10.9

Size: 4.2′
PA: ?

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Historical observations

William Herschel (c.1784)

Synonyms: H II-587

Discovered in 1786 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "F, cL, iF."

Published comments

Shapley, H. (1930) "Star Clusters" Harvard Obs. Monographs No. 2

Included in a list of doubtful objects;. Very faint and poor; suggestion of a background on Mount Wilson plates.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 12.5 mag globular cluster.

Harris, W.E. (1997)

RA 17 44 54.7 (2000) Dec +03 10 13 Integrated V magnitude 11.01 Central surface brightness, V magnitudes per square arcsecond 20.37 Integrated spectral type G1:- Central concentration, c = log(r_total/r_core); a 'c' denotes a core-collapsed cluster 1.70 Core radius in arcmin .26. ["Catalog Of Parameters For Milky Way Globular Clusters", compiled by William E. Harris, McMaster University. (Revised: May 15, 1997; from http://www.physics.mcmaster.ca/Globular.html; Harris, W.E. 1996, AJ, 112, 1487) ]

Modern observations

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "12M; 2' diameter; small and faint with little brighter center; unresolved."

Mitsky, Dave (IAAC)

Observer: Dave Mitsky (e-mail: djm28@psu.edu)

Instrument: 17-inch other Location: Harrisburg, Pa, U.S.A.

Light pollution: moderate Transparency: fair Seeing: fair

Time: Fri Jun 27 04:30:00 1997 UT Obs. no.: 155

I also located 2 new Herschel globulars that night, namely NGC 6144 near Antares and NGC 6426 northwest of Gamma Ophiuchi. NGC 6426 was particularly faint, being just at the limit of visibility with averted vision.

Steve Coe

Steve Coe, using a 13" f/5.6, notes: "Pretty faint, pretty large, elongated 1.5 X 1 in PA 25, somewhat brighter in the middle, 10 stars resolved at 100X from Cherry Rd. This a low surface brightness object."

[amastro] Toughest NGC-globulars

In my opinion, the toughest NGC-globular would be NGC6749 in Aquila. It has

also wrong coordinates in many sources, has a low surface brightness and is in

a rich star field. NGC7492 in Aquarius, NGC6426 in Ophiuchus and NGC1049 in the

Fornax Dwarf are other NGC-toughies.

0.2 deg SE of NGC6380, there is a dark nebula called SL28. Has anybody

seen it?

/Timo

------------------------------------------------------------------------

Timo Karhula "Amateur astronomers are * *

E-mail: atotika@ato.abb.se nocturnal creatures" * * *

ICBM: +59d52'13" +16d05'22"

----------------------------------------------------------- * *

Contemporary observations

Auke Slotegraaf

1997 July 7

1997 July 7, Monday, 21:00 - 24:00 Jonkershoek. 11x80's tripod-mounted. Very careful study; nothing found.

Tom Bryant

2010 7 1 23:32:21

Observing site: Little Bennett Regional Park

Telescope: C-11

[17h 44m 54s, 3 0m 0s] An extremely faint cluster, invisible in the 30mm, hardly seen in the 18. No resolution.

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