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Deep Sky Observer's Companion – the online database

 

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Entire DOCdb database of 18,816 objects.

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NGC 7128 (16,884 of 18,816)

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NGC 7128

NGC 7128, Cl Collinder 440, C 2142+534, Ocl 218, VII 40, h 2130, GC 4701

RA: 21h 44m 0s
Dec: +53° 43′ 0″

Con: Cygnus
Ch: MSA:1087, U2:57, SA:3

Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)

(reference key)

Type: open cluster, 13m

Mag: B=10.54, V=9.7

Size: 4′
PA: ?

Historical observations

William Herschel (c.1784)

Synonyms: H VII-040

Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of small stars of several sizes, 3' or 4' diameter, pretty rich like a forming one."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 3.2' and the class as 2 2 p.

Photo index

Photo Index by Jim Lucyk: Observer's Guide (Astro Cards) 9-10/87 p28.

Sulentic & Tifft (1973)

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

Modern observations

Walter Scott Houston

Houston observed with a 10-inch at 60x and saw half a dozen stars surrounded by a glow at the threshold of visibility. Increasing the power to 150x with a barlow added about 15 stars, but, surprisingly, the glow remained. He also wrote: "this cluster is scarcely as big in angular size as many planetary nebulae. It needs 100x to 150x in any telescope. Its brighter members remined me of a tiny replica of Auriga, with a background haze of fainter suns."

Ancient City Astron.Club (1980)

Listed by the Herschel Club, described as "some 20 stars were counted, very loose and poor. 8-inch, 43x."

Tom Lorenzin

Tom Lorenzin, in the e-version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "9M; 2' diameter; 30-plus 10M and dimmer members; small, compressed and memorable! brighter members make small pentagon."

Brian Skiff

WDS: pair on SE = h3058: 11.1,12.2; 8".7; 264.

6cm - vsim to -27. sm w/br * on SE edge. sev sparkles.

15cm - sim to N7031 just obs'd in that it is a sm circlet of rel br *s in dk area. 140x: 15 *s incl m10 * on E side of circlet, others fntr. m12.0 approx = pair on W side. another f pair 10' W. BS, 21Jun1991, Anderson Mesa.

25cm - 15 *s, ten of which in a circlet incl two pairs, a triplet and three single *s. 2' diam, roughly octagonal.

30cm - neat, sm. circlet of about nine *s incl reddish br one, is like jeweled necklace hanging from cl which is about the NW side of the circlet. 10 *s plus circlet, all vf.

Contemporary observations

Magda Streicher

(no date)

Alldays (22.50S, 20.12E, 770m).

12-inch f/10 SCT (95x, 218x)

This lovely small grouping share its space very cosy. Form a sort of ring in shape with various coloured stars. One outstanding yellow star on the SE tip. Barely 3' in size if I compare with the field of view. Clusters shows a teensy ring of five stars with one star acting like the Yellow jewel in the engagement ring and also being brighter than the rest.

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Lacaille's catalogue

The Messier objects

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