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Rare star 36 EP

Mizar

RA 200.9812° · Dec 54.9254° · star

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Score breakdown

· 7 badges
36 pts · Rare
Rare 50 pts → Epic
  • Naked-eye visible +8
  • Has a proper name +8
  • Binary star +6
  • White A-type star +5
  • Never sets (northern circumpolar) +4
  • Star +3
  • Main-sequence star +2
Total score 36

14 more points to reach Epic.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Binary star · +6
  • Has a proper name · +8
  • Never sets (northern circumpolar) · +4
  • White A-type star · +5
  • Main-sequence star · +2

Trivia

What makes it special

  • Not one star but two. It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

What it actually is

  • Spectral class. Its spectrum reads A2V — 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 on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 2.2 you can see it with your own eyes from a dark site, over in Ursa Major.
  • 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 April — that's when to go looking.

Could we get there?

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

Properties

absmag
0.129
binary
yes
bv
0.057
constellation
UMa
dist ly
85.8081
luminosity
77.3393
mag
2.23
name
Mizar
named
yes
spect
A2V

About Mizar

Mizar is a rare star. It lies about 85.8 light-years from Earth, sits in the constellation UMa, shines at apparent magnitude 2.23 and has spectral type A2V.

It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

How to see it

Look for Mizar in the constellation UMa. At apparent magnitude 2.23, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Mizar 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 Mizar is a rare star

Mizar 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 — Star, Naked-eye visible, Binary star, Has a proper name, Never sets (northern circumpolar), White A-type star and Main-sequence 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.