About NGC 5844
NGC 5844 is an uncommon nebula. It sits in the constellation TrA and shines at apparent magnitude 13.2.
A planetary nebula: the shed outer atmosphere of a dying Sun-like star, lit from within by the naked stellar core left behind.
Uncommon nebula 23 EP
NGC 5844
RA 227.6706° · Dec -64.6737° · openngc
Score breakdown
· 3 badgesUncommon 34 pts → Rare
- Planetary nebula (a dying star's shell) +12
- Nebula +8
- Faint fuzzy (mag > 13) +3
Total score 23
11 more points to reach Rare.
Badges
- Nebula · +8
- Planetary nebula (a dying star's shell) · +12
- Faint fuzzy (mag > 13) · +3
Trivia
What it actually is
- What it actually is. A planetary nebula: the shed outer atmosphere of a dying Sun-like star, lit from within by the naked stellar core left behind.
Find it in the sky
- How to spot it. At magnitude 13.2 it is far too faint for the eye: this one belongs to cameras and long exposures, over in Triangulum Australe.
- Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
- Best time of year. It stands highest in the middle of the night around May — that's when to go looking.
Its true colour
- Its true colour. Its teal-green comes from doubly-ionised oxygen at 501 nanometres, and its red from hydrogen at 656 — colours no ordinary object on Earth produces.
What's in a name
- A misleading name. 'Planetary nebula' is a 240-year-old mistake. William Herschel coined it in the 1780s because these round greenish discs resembled the planet Uranus he had just discovered. There are no planets involved whatsoever.
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
- TrA
- dso type
- PN
- mag
- 13.2
- name
- NGC 5844
- radial velocity kms
- 60
- redshift
- 0.0002
- size arcmin
- 0.88
How to see it
Look for NGC 5844 in the constellation TrA. At apparent magnitude 13.2, it takes a larger telescope or a long-exposure image to capture.
Like any astronomical target, NGC 5844 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 5844 is an uncommon nebula
NGC 5844 scores 23 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 11 points would lift it into a rarer tier.
That score comes from 3 science badges — Nebula, Planetary nebula (a dying star's shell) and Faint fuzzy (mag > 13) — 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.