NGC 1528

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Historical observations

William Herschel (c.1784)

Synonyms:H VII-061

Discovered in 1790 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a beautiful cluster of large stars, very rich, and considerably compressed, about 15' diameter."

Published comments

Trumpler, R.J. (1928)

Trumpler (Lick Obs. Bulletin, Vol 14, No 420) gives the diameter as 22' and the class as 2 2 m.

Raab, S. (1922)

Raab, S. (1922) A research on open clusters. Lund Medd. Astron. Obs. Ser. II, 28, 1.

Discussed, based of F-A plates.

Melotte, P.J. (1915)

A catalogue of star clusters shown on Franklin-Adams chart plates. Mem.R.A.S., 60(5), 175-186.

Doig, P. (1925)

Doig, P. (1925) Notes on the nebulae and clusters in Webb's 'Celestial Objects for Common Telescopes' (Sixth edition, Vol.ii). Part IV. M.N.R.A.S., 36(2), 58.

Bailey, S.I. (1908)

"cluster, coarse."

Bailey, S.I. (1908) A catalogue of bright stars and nebulae. Ann.Harv.Coll.Obs., 60(8), 199.

Doig, P. (1926)

Doig, P. (1926) "A Catalogue of Estimated Parallaxes of 112 Nebulae, Open clusters and Star Groups", Vol 36 (4), p 107-115.

"open irregular cluster with several groups." He gives the approx. diameter as 30 arcmin.

Photo index

Photo Index by Jim Lucyk: Burnhams V3 p1452.

Sulentic & Tifft (1973)

The RNGC (Sulentic and Tifft 1973) notes that this is a 6.5 mag open cluster.

Modern observations

Walter Scott Houston

Houston writes that this cluster has a total magnitude of 6.4. It can be glimpsed with the naked eye, though viewing is hampered by the glare of nearby stars, especially 4th mag Lambda Persei. Sagot and Texereau in Revue des Constellations report that 40 stars are visible in a 3-inch at 18x, and twice as many in a 6-inch at 80x. Houston adds: "In my 10-inch reflector, nearly 100 stars are seen resolved in the cluster, which is 25' in diameter."

Tom Lorenzin

Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "6M; 25' diameter; 80-plus 9M and dimmer members; large but sparse for its size."

Ancient City Astron.Club (1980)

Listed by the Herschel Club, described as "some 80 stars in fine grouping of loosely packed stars, slightly circular and rich. 6-inch, 35x."

Steve Gottlieb

04 15.3 +51 13

13: 80-100 stars in a 20' diameter. There are three bright stars on the W side including mag 8.5 SAO 24496 and mag 9.0 SAO 24501, includes many faint stars. Extremely faint naked-eye object in dark sky!

Gross, Todd (IAAC)

Observer: Todd Gross Your skill: Intermediate Date and UT of observation: 11/5/97 0800 GMT Location & latitude: 22 miles west of Boston, Ma. 42.3N Site classification: Suburban Limiting magnitude (visual): 5.2 (estimated) 5.2 (est) in vicinity of object Seeing (1 to 10 - worst-best): 8 Moon up (phase?): No Weather: Clear Instrument: 16" Newtonian-dob w. 96/99% coatings f/4.59 Magnifications: 124x Filters used: none Object: NGC 1528 Constellation: Object data: Open Cluster Personal "rating" (at this aperture): C+/B-

Description: "This is a large, loose-medium open cluster with not particularly bright, not particularly dim stars. May have looked more interesting at lower magnification."

Callender, John (IAAC)

Observer: John Callender (e-mail: jbc@west.net, web: http://www.west.net/~jbc/); Instrument: 50-mm binoculars Location: Carpinteria, CA, USA; Light pollution: light Transparency: good Seeing: poor; Time: Mon Feb 3 05:30:00 1997 UT Obs. no.: 41;

Description: "A bright, medium-sized, irregular glow."

Contemporary observations

Tom Bryant

2010 11 9 21:21:40

Observing site: Little Tycho Observatory

Telescope: C-8

[4h 15m 24s, 51° 14m 0s] A large, scattered group of about 50 stars, 10-12mv. Nice.