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Uncommon nebula 25 EP

NGC 249

RA 11.3869° · Dec -73.0801° · openngc

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Score breakdown

· 3 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Star-forming region +14
  • Nebula +8
  • Faint fuzzy (mag > 13) +3
Total score 25

9 more points to reach Rare.

Badges

  • Nebula · +8
  • Star-forming region · +14
  • Faint fuzzy (mag > 13) · +3

Trivia

What it actually is

  • What it actually is. An H II region: a cloud of hydrogen being ionised by the ultraviolet flood from hot young stars inside it. Every one is a star factory caught mid-production.

Find it in the sky

  • How to spot it. At magnitude 13.8 it is far too faint for the eye: this one belongs to cameras and long exposures, over in Tucana.
  • 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 October — that's when to go looking.

Its true colour

  • Its true colour. That signature crimson is hydrogen-alpha at 656 nanometres — electrons falling back onto protons, one photon at a time.

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
Tuc
dso type
HII
mag
13.8
name
NGC 249
size arcmin
1.1

About NGC 249

NGC 249 is an uncommon nebula. It sits in the constellation Tuc and shines at apparent magnitude 13.8.

An H II region: a cloud of hydrogen being ionised by the ultraviolet flood from hot young stars inside it. Every one is a star factory caught mid-production.

How to see it

Look for NGC 249 in the constellation Tuc. At apparent magnitude 13.8, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, NGC 249 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 249 is an uncommon nebula

NGC 249 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 3 science badges — Nebula, Star-forming region 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.