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NGC 5694
ESO512-SC010, GCL-29
RA 14:39:35
Dec -26°32.0'
Globular
cluster |
Discovered in 1784 by William Herschel (H
II-196) "pB, S, nearly R, bM, r."
Hartung notes: “this is one of the remote
globulars which can be resolved only by large instruments; it is a conspicuous
round symmetrical haze, well condensed towards the centre and about 1’
across. . . it is a clear hazy spot with 10.5cm.”
Houston notes that this cluster is only 2' in
diameter and may be mistaken for an 11th mag star in a 4-inch at low power. He
adds that a 10-inch will reveal it clearly. He includes this globular in his
Hydra Hysteria. He writes: "With a diameter of more than 3' and shining at
10th mag, it should be relatively easy to find." He notes that it is "smaller,
fainter and more concentrated than NGC 5897. About 4' in diameter, it shines
with the total light of a 10th mag star. None of its stars could be resolved in
a 10-inch." In 1972 he called it one of two globulars worth-while looking
up in Hydra (the other being NGC 4590). He estimated the magnitude as 10th or
11th: "though only 2' in diameter, it can be seen in my 5-inch binoculars
after its exact place has been noted relative to nearby stars."
Steve Coe (1992, The Deep-Sky Observer, Webb
Society, Issue 1) observing with a 17.5-inch f/4.5 at 100x notes: "pB, pL,
R, bM; 165x and 320x very gainy, no resolution on a night I rated 5/10. At a
much better site on an evening I rated 8/10 the 17.5-inch would show 6 stars
superimposed on a hazy outer corona."
Van den Bergh and Hagen ("UBV photometry
of star clusters in the Magellanic Clouds", Astronomical Journal, Vol. 73,
1968) find that the integrated V magnitude through a 60'' diaphragm is 10.63.
Through a 30'' diaphragm V = 11.04. They classify it as a globular cluster.
Tom Lorenzin: “11M; 2' diameter; small,
round glow of unresolved stars with brighter center; very distant globular at
approximately 103,000 light years.” |
