Basic object information
Object name: NGC 4755
Popular name: Jewel Box
Cluster Object type: Open cluster
Magnitude: 4.2 Size: 10.0'
Magnitude of brightest star: 5.8
Object classification: I 3 r
Description: !!Cl,vL,Ri,st vB (Kappa Cru) Notes: Jewel Box Cluster;50 * mags 6..10;many tinted *

Catalog information
RA (J2000.0): 12h 53m 36.0s
Dec (J2000.0): -60 21' 00"

Constellation: Crux

Observer: Iiro Sairanen
Obs. pObs. place: Wicherina, Greenough, Australia
Date/Time: 12/13.12.2009 2:30

Telescope: Newton 110/805 mm

Magn: 115x
Field: 43'
SQM: 21.8 (1)
Visuality: I

Filter: -
NE Lim.mag: 7.4
SeeingSeeing: 2
Height: 32

Weather: +18C

Jewel Box. A very beautiful open cluster as name implies. There are three to five ~6 mag stars and few dozens fainter. Nicely detached and compressed.