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Rare variable star 36 EP

22Eps UMi

RA 251.4924° · Dec 82.0373° · star

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Score breakdown

· 7 badges
36 pts · Rare
Rare 50 pts → Epic
  • Naked-eye visible +8
  • Sun-like G-type star +8
  • Giant star +6
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 36

14 more points to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Never sets (northern circumpolar) · +4
  • Sun-like G-type star · +8
  • Giant star · +6
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G5IIIvar — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
  • It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 4.2 you can see it with your own eyes from a dark site, over in Ursa Minor.
  • 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 June — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
-0.637
bv
0.897
constellation
UMi
dist ly
303.9663
luminosity
156.603
mag
4.21
name
22Eps UMi
spect
G5IIIvar
var amplitude
0.05
var designation
Eps
var max
4.203
var min
4.253

About 22Eps UMi

22Eps UMi is a rare variable star. It lies about 304 light-years from Earth, sits in the constellation UMi, shines at apparent magnitude 4.21 and has spectral type G5IIIvar.

Its spectrum reads G5IIIvar — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for 22Eps UMi in the constellation UMi. At apparent magnitude 4.21, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 22Eps UMi 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 22Eps UMi is a rare variable star

22Eps UMi scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 14 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Never sets (northern circumpolar), Sun-like G-type star, Giant star, Barely variable (under 0.05 mag) and A named variable star — 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.