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Uncommon galaxy 30 EP

UGC 4305

RA 124.7707° · Dec 70.7200° · openngc

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Score breakdown

· 3 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Galaxy +14
  • Irregular galaxy (no shape at all) +12
  • Never sets (northern circumpolar) +4
Total score 30

4 more points to reach Rare.

Badges

  • Galaxy · +14
  • Irregular galaxy (no shape at all) · +12
  • Never sets (northern circumpolar) · +4

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.
  • Irregular. An irregular galaxy — no disc, no bulge, no symmetry. Most have been pulled out of shape by a larger neighbour's gravity.

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 10.8 you'll want a small backyard telescope, over in Ursa Major.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around January — that's when to go looking.

Its true colour

  • Its true colour. Its colour is a census: blue where gas is still collapsing into hot young stars, yellow-red in the old, settled core.

Properties

constellation
UMa
dso type
G
hubble
I
mag
10.75
name
UGC 4305
radial velocity kms
157
redshift
0.0005
size arcmin
7.94
surface brightness
24.08

About UGC 4305

UGC 4305 is an uncommon galaxy. It sits in the constellation UMa and shines at apparent magnitude 10.75.

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 UGC 4305 in the constellation UMa. At apparent magnitude 10.75, a small backyard telescope will bring it into view.

Like any astronomical target, UGC 4305 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 UGC 4305 is an uncommon galaxy

UGC 4305 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 3 science badges — Galaxy, Irregular galaxy (no shape at all) and Never sets (northern circumpolar) — 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.