Open cluster · Crux
NGC 4755 Jewel Box
Also known as: C94
mag 4.27.8′ across
About
NGC 4755 (Jewel Box) is an open cluster of magnitude 4.2 in Crux, about 7.8′ across.
How to find it
- NGC 4755 is in the constellation Crux.
- Best evenings: around mid-May it is highest at about 9 pm (10 pm in summer time); a month earlier, two hours later.
- Where on Earth: it is seen well, at least 10° up, from south of 20° N.
- Southern Cross and the Pointers: A small cluster of coloured stars 1° from Mimosa; binoculars or a small telescope.
When it rises and sets tonight, how high it climbs and how much the Moon gets in the way are worked out in your browser for your place.
What you will see
- EyesA hazy patch or a knot of faint stars from a dark site.
- Binoculars (10×50)A small knot of stars, partly resolved.
- Telescope (6–8 inch)Dozens of stars, many sharp and some coloured.
For a dark country sky with no Moon. From a city, faint galaxies and nebulae can disappear completely.
Facts
| Designations | NGC 4755, C94 |
|---|---|
| Type | Open cluster |
| Magnitude | 4.2The smaller the number, the brighter. |
| Apparent size | 7.8′the full Moon is 31′ across |
| Constellation | Crux |
| Right ascension (J2000) | 12h 53m 37.1s |
| Declination (J2000) | −60° 21′ 23″ |
More in Crux
Sources and credits
Catalog data: OpenNGC by Mattia Verga, CC BY-SA 4.0, and d3-celestial by Olaf Frohn, BSD 3-Clause. All data sources →