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Epic variable star 57 EP

Pherkad

RA 230.1822° · Dec 71.8340° · star

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Score breakdown

· 9 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Bright giant +12
  • Intrinsically luminous (Mv < −2) +10
  • Naked-eye visible +8
  • Has a proper name +8
  • Variable star +5
  • White A-type star +5
  • Never sets (northern circumpolar) +4
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 57

21 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Has a proper name · +8
  • Never sets (northern circumpolar) · +4
  • White A-type star · +5
  • Bright giant · +12
  • Intrinsically luminous (Mv < −2) · +10
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A3II-III — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.
  • 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 3 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 May — that's when to go looking.

Could we get there?

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

Properties

absmag
-2.87
bv
0.058
constellation
UMi
dist ly
486.7999
luminosity
1224.6162
mag
3
name
Pherkad
named
yes
spect
A3II-III
var amplitude
0.02
var designation
Gam
var max
2.996
var min
3.016

About Pherkad

Pherkad is an epic variable star. It lies about 486.8 light-years from Earth, sits in the constellation UMi, shines at apparent magnitude 3 and has spectral type A3II-III.

Its spectrum reads A3II-III — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for Pherkad in the constellation UMi. At apparent magnitude 3, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Pherkad 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 Pherkad is an epic variable star

Pherkad scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 9 science badges — Variable star, Naked-eye visible, Has a proper name, Never sets (northern circumpolar), White A-type star, Bright giant, Intrinsically luminous (Mv < −2) and Barely variable (under 0.05 mag) — 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.