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NGC 2509
NGC 2509, Cl Collinder 171, Cl Melotte 81, C 0758-189, Ocl 630, VIII 1, GC 1613
RA: 08h 00m 42s
Dec: −19° 04′ 0″
Con: Puppis
Ch: MSA:858, U2:320, SA:20
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 11r
Mag: B=?, V=9.3
Size: 6′
PA: ?
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 2509. See NGC 2319.
Historical observations
William Herschel (c.1784)
Synonyms: H VIII-001
Discovered in 1783 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of coarsely scattered stars. The place is that of the most compressed part which is not in the middle."
Published comments
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.
Trumpler, R.J. (1928)
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 4.5' and the class as 1 2 m.
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 9.5 mag open cluster.
Modern observations
Ancient City Astron.Club (1980)
Listed by the Herschel Club, described as "some 40 stars counted, nice small cluster, quite rich, some bright stars, most are faint. 8-inch, 48x."
Tom Lorenzin
Tom Lorenzin, in the electronic version of "1000+ The Amateur Astronomers' Field Guide to Deep Sky Observing", notes: "10M; 4' diameter; small, bright, rich and compact; 40-plus 10M and dimmer members."
Steve Coe
Steve Coe, observing with a 13" f/5.6, notes: "Bright, pretty large, pretty rich, compressed, 39 stars of mags 10 to 13 counted at 100X. This cluster can just be seen in the 11X80 finder."
Mitsky, Dave (IAAC)
Observer: Dave Mitsky
Location: ASH Naylor Observatory, Lewisberry, PA
Date:1/3/98, Time: 04:05 UT
Conditions: Seeing - poor, Transparency - good, Limiting Magnitude - 5.0
Instrument: 17" f/15 classical Cassegrain
Ocular: 2" 55mm Ploessl (118x)
This attractive, small (4'), and rich Herschel 400 open cluster consists of some 40 mostly faint stars.
Contemporary observations
Tom Bryant
2011 3 8 20:41:11
Observing site: Little Tycho Observatory
Telescope: C-8
[8h 0m 42s, -19° 4' 0"] The field was found, but no cluster. It looks like the rest of the milky way here. WikiSky: A cluster of about 20 stars, mv 12... It was swamped by the light pollution and needs darker skies.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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