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Common variable star 21 EP

GL GJ 3712B

RA 182.8619° · Dec 53.4187° · star

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Score breakdown

· 5 badges
21 pts · Common
Common 22 pts → Uncommon
  • Binary star +6
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • Orange K-type star +3
  • A named variable star +3
Total score 21

1 more point to reach Uncommon.

Badges

  • Variable star · +5
  • Binary star · +6
  • Never sets (northern circumpolar) · +4
  • Orange K-type star · +3
  • A named variable star · +3

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 K0 — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
  • 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 8.1 it is just past naked-eye reach — ordinary binoculars will pull it in, 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 March — that's when to go looking.

Could we get there?

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

Properties

absmag
5.392
binary
yes
bv
0.88
constellation
UMa
dist ly
115.6171
luminosity
0.607
mag
8.14
name
GL GJ 3712B
spect
K0
var designation
MZ

About GL GJ 3712B

GL GJ 3712B is a common variable star. It lies about 115.6 light-years from Earth, sits in the constellation UMa, shines at apparent magnitude 8.14 and has spectral type K0.

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 GL GJ 3712B in the constellation UMa. At apparent magnitude 8.14, it is an easy target for binoculars.

Like any astronomical target, GL GJ 3712B 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 GL GJ 3712B is a common variable star

GL GJ 3712B scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Binary star, Never sets (northern circumpolar), Orange K-type star 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.