About Christmas Tree Cluster
Christmas Tree Cluster is a common cluster. It sits in the constellation Mon and shines at apparent magnitude 3.9.
Notable enough to have earned a proper name, not just a catalogue number.
Common cluster 21 EP
Christmas Tree Cluster
RA 100.2427° · Dec 9.8955° · openngc
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Has a proper name +8
- Star cluster +7
- Bright deep-sky object +6
Total score 21
3 more points to reach Uncommon.
Badges
- Star cluster · +7
- Bright deep-sky object · +6
- Has a proper name · +8
Trivia
How we found it
- Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- constellation
- Mon
- dso type
- Cl+N
- mag
- 3.9
- name
- Christmas Tree Cluster
- named
- yes
How to see it
Look for Christmas Tree Cluster in the constellation Mon. At apparent magnitude 3.9, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, Christmas Tree Cluster 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 Christmas Tree Cluster is a common cluster
Christmas Tree Cluster scores 21 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 3 science badges — Star cluster, Bright deep-sky object and Has a proper name — 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.