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Uncommon galaxy 32 EP

NGC 147

RA 8.3005° · Dec 48.5087° · openngc

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Score breakdown

· 4 badges
32 pts · Uncommon
Uncommon 34 pts → Rare
  • Galaxy +14
  • Coming towards us +10
  • Elliptical galaxy +4
  • Never sets (northern circumpolar) +4
Total score 32

2 more points to reach Rare.

Badges

  • Galaxy · +14
  • Elliptical galaxy · +4
  • Never sets (northern circumpolar) · +4
  • Coming towards us · +10

Trivia

What it actually is

  • What it actually is. A galaxy: a gravitationally bound city of stars, gas and dark matter, turning so slowly that a single rotation takes hundreds of millions of years.
  • Elliptical. An elliptical galaxy: a smooth swarm of stars on randomly tilted orbits, with almost no cold gas left to build anything new.

Sense of scale

  • Scale. Home to hundreds of billions of stars — a universe unto itself, and every one of those points of light could have planets.

Find it in the sky

  • How to spot it. At magnitude 9.7 you'll want a small backyard telescope, over in Cassiopeia.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Its true colour

  • Red and dead. Ellipticals glow reddish because every short-lived blue star they ever had has already died. Astronomers call them 'red and dead'.

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
Cas
dso type
G
hubble
E
mag
9.72
name
NGC 147
radial velocity kms
-193
size arcmin
9.4
surface brightness
24.29

About NGC 147

NGC 147 is an uncommon galaxy. It sits in the constellation Cas and shines at apparent magnitude 9.72.

A galaxy: a gravitationally bound city of stars, gas and dark matter, turning so slowly that a single rotation takes hundreds of millions of years.

How to see it

Look for NGC 147 in the constellation Cas. At apparent magnitude 9.72, a small backyard telescope will bring it into view.

Like any astronomical target, NGC 147 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 147 is an uncommon galaxy

NGC 147 scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.

That score comes from 4 science badges — Galaxy, Elliptical galaxy, Never sets (northern circumpolar) and Coming towards us — 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.