About NGC 2818A
NGC 2818A is a common cluster. It sits in the constellation Pyx and shines at apparent magnitude 12.5.
A star cluster still wrapped in the nebula that made it — newborn stars lighting up their own birth cloud.
Common cluster 19 EP
NGC 2818A
RA 139.0255° · Dec -36.6269° · openngc
Score breakdown
· 2 badgesCommon 22 pts → Uncommon
- Cluster still wrapped in its gas +12
- Star cluster +7
Total score 19
3 more points to reach Uncommon.
Badges
- Star cluster · +7
- Cluster still wrapped in its gas · +12
Trivia
What it actually is
- What it actually is. A star cluster still wrapped in the nebula that made it — newborn stars lighting up their own birth cloud.
Find it in the sky
- How to spot it. At magnitude 12.5 it is far too faint for the eye: this one belongs to cameras and long exposures, over in Pyxis.
- Southern sky. It rides the southern half of the sky — an easier target the further south you are.
- Best time of year. It stands highest in the middle of the night around February — that's when to go looking.
Its true colour
- Its true colour. The stars are blue-white and brand new; the gas around them glows red, ionised by their ultraviolet glare.
How we came to know it
- The New General Catalogue. Its NGC number comes from J. L. E. Dreyer's 1888 catalogue, itself built on decades of sky sweeps by William Herschel and his sister Caroline.
Properties
- constellation
- Pyx
- dso type
- Cl+N
- mag
- 12.5
- name
- NGC 2818A
- radial velocity kms
- 21
- redshift
- 0.0001
- size arcmin
- 6.9
How to see it
Look for NGC 2818A in the constellation Pyx. At apparent magnitude 12.5, it takes a larger telescope or a long-exposure image to capture.
Like any astronomical target, NGC 2818A is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
Why NGC 2818A is a common cluster
NGC 2818A scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.
That score comes from 2 science badges — Star cluster and Cluster still wrapped in its gas — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.