Proyecto Astronómico Constelación Cruz del Sur southern_cross_colegio_cristobal_colon | Page 5

NGC
NGC
NGC
Ru
Hogg
Tr
Hogg
PK
PK
PK
PK
PK
PK
PK
4439
4052
4337
97
14
20
15
298-0,1
300-0,1
298-1,2
299+2,1
300+0,1
299-0,1
300-1,1
Open cluster
Open cluster
Open cluster
Open cluster
Open cluster
Open cluster
Open cluster
Planetary nebula
Planetary nebula
Planetary nebula
Planetary nebula
Planetary nebula
Planetary nebula
Planetary nebula
8,4
8,8
8,9
9,1
9,5
10,1
10,3
11
11,7
12,4
12,7
12,9
13,6
13,8
The most interesting cluster in the Southern Cross is the Jewel Box (NGC 4755):
Image: Space Telescope Science Institute.
Image by astrophotographer Pedro Aguirre V.
(http://astrosurf.com/pedro).
Image: http://simbad.u-strasbg.fr/sim-fid.pl
Some magnitudes in the Jewel Box:
Table 6 - Source: http://www.seds.org/messier/xtra/ngc/n4755.html
Right ascension
Declination
Distance
Visual bright
Apparent size
12h 53.6’
-60 degrees 20’
7600 light years
4,2 magnitude
10 arcmin
Nicolas Lacaille discovers and then mentions the Jewel Box in Coelum Australe
Stelliferum in 1763. This is a young star cluster, approximately 7 million years old. [10]