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RA: 14h 53m 36s
Dec: −52° 41′ 0″
Ch: MSA:969, U2:431, SA:25
Ref: SIMBAD, Collinder (1931), DAML02, Archinal&Hynes (2003)
Type: open cluster, 31p
Mag: B=?, V=12.6
Discovered by Sir John Herschel at the Cape of Good Hope with an 18-inch f/13 speculum telescope. He recorded it as "a small elongated close group of vS milky way stars 3' long, 1.5' broad, so close and faint as to approach very near to the character of a nebula."
The RNGC (Sulentic and Tifft 1973) notes that this is a 12.5 mag open cluster.
Trumpler (Lick Obs Bul, Vol 14, No. 420) gives the diameter as 2.2' and the class as 1 2 p.
"Cat. of Open Cl. south of -45° Decl.", Mem. 17 Mnt Stromlo Obs.
1998-04-24/25, 11x80 tripod-mounted binoculars, Die Boord. Seeing average, transparency below average, dew. "No found."
1997-10-02, Franschoek Pass viewing site, 6-inch f/8.6 Newtonian, obvious haze and thin clouds, sky fairly bright around horizon. "Perhaps seen as an extremely, extremely faint presence?"
16-inch f/10 SCT (127x, 290x, 463x)
At first I could not see any cluster. Although a string 8'of stars from NE to SW is obvious. What is NGC 5764 is a faint knot of a few stars at the SW end of this string. Homework shows that it is indeed the case.
The Messier objects
The Bennett objects
The Caldwell list
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