|
NGC 6541
Bennett 104
ESO280-SC004, Dun 473
RA 18:07:59
Dec -43°
42.0'
Globular cluster |
Dunlop 473: “a very bright round highly
condensed nebula, about 3' diameter. I can resolve a considerable portion round
the margin, but the compression is so great near the centre, that it would
require a very high power, as well as light, to separate the stars; the stars
are rather dusky.”
h: “globular, B, R, e comp, v Fine;
diameter of most comp part = 11 seconds of time in RA; stars 15..16m. The
scattered stars extend to three times the diameter and die away very gradually.”
On a second occassion he called it “B, R, gbM, diam in RA = 6 seconds,
easily resolvable. The left eye resolves it (Query semi-diameter.)”
Bailey, examining a Bruce plate (Harvard
Annals, Vol 72, No 2), describes it as “remarkable globular cluster,
bright, pretty compressed, several hundred faint stars, diameter 12'.”
Hartung notes: “The combination of this
globular cluster and its starry field is most beautiful; it is well condensed,
round and resolved into gleaming stars, the outliers up to 6’ across. 15cm
shows stars in it but it is only mottled with 10.5cm and is an easy luminous
haze with 7.5cm.”
Glen Cozens calls this an impressive cluster,
noting that it lies in a rich Milky Way field which “adds luster to the
view.”
Harris: Integrated V magnitude 6.30 Central
surface brightness, V magnitudes per square arcsecond 15.58 Integrated spectral
type F6- Central concentration, c = log(r_total/r_core); a 'c' denotes a
core-collapsed cluster 2.00c: Core radius in arcmin .30. [“Catalog Of
Parameters For Milky Way Globular Clusters”, compiled by William E. Harris,
McMaster University. (Revised: May 15, 1997; from
http://www.physics.mcmaster.ca/Globular.html; Harris, W.E. 1996, AJ, 112, 1487)
]
11x80: Bright, round fuzzy
glow, neat contrast to the bright star north-west; several very bright stars
share the field. (suburban skies) [AS]
12-inch Meade: A medium
sized globular cluster, just about to reveal small faint stars towards the
fringes, which run towards the far outside of the field. Compressed and brighter
towards the middle, with an uneven disk. Dark lanes become visible but you have
to look very carefully. (40mm eyepiece, 53’ fov) [AS] |
