NGC 4755
DSS image of NGC 4755
Overlaid DSS image of NGC 4755, 30' x 30' with north at top and west to the right

Aladin viewer for the region around NGC 4755
Jewel Box, Herschel's Jewel Box, Kappa Crucis Cluster
Lac II.12, Melotte 114, Lund 627, C 1250-600, OCl 892

Type  Open Cluster
Magnitude  4.2
Size  10'
Right Ascension  12h 53' 38"  (2000)
Declination  60° 21' 24" N
Constellation  Ursa Major
Description  !!Cl, vL, Ri, st vB (Kappa Cru)
Classification  I 3 r
Observing Notes

Andrew Cooper
Jan 13, 2022    Lawa'i Beach, Kauai, Hawaii (map)
8x42mm Nikon Prostaff 3S Binoculars @ 8x
Seeing: 6 Transparency: 6 Moon: 0%

Small bright and obvious, a tight and very bright 10' group, rich, partially resolved, 1° south of Becrux

Andrew Cooper
May 12, 2018    Kaʻohe, Mauna Kea, HI (map)
20cm f/6 Newtonian, Cave Astrola @ 56x
Seeing: 8 Transparency: 7 Moon: 0%

The Jewelbox! simply beautiful, a bright coarse cluster, multiple colors visible, a red, a couple orange, a yellow, and a blue, some describe a green at the center which I do not see, 10' across, fully reslved

Andrew Cooper
Feb 10, 2013    Hale Pohaku, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 175x
Seeing: 6 Transparency: 7 Moon: 0%

The Jewelbox Cluster, a bright, large cluster, just visible to the unaided eye, a few dozen 6-8 magnitude members highlight the hundred or more fainter, a few of the central stars exhibit nice colors including a notable red and a gold at the center of the cluster

Andrew Cooper
Jun 10, 2010    Hale Pohaku, HI (map)
46cm f/4.5 Newtonian, Deep Violet @ 60x
Seeing: 8 Transparency: 7.5 Moon: 0%

Good sized @ 10', bright, coarse cluster just southeast of Mimosa, three bright members outline the cluster forming an isoceles triangle, a notable red star at the very center, many people consider the cluster a favorite, I have never been that impressed

Andrew Cooper
Apr 5, 2007    Hale Pohaku, HI (map)
15cm f/5 Newtonian, Primero @ 97x
Seeing: 7 Transparency: 7 Moon: 0%

Rich, bright, a clumpy cluster about 10' across with half a dozen brighter members and clumps of dim unresolved stars
Other Data Sources for NGC 4755
Nearby objects for NGC 4755
1 object found within 120'
HD 111456
Credits...

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page

NGC 4755