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Rare star 34 EP

Aljanah

RA 311.5527° · Dec 33.9703° · star

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Score breakdown

· 6 badges
34 pts · Rare
Rare 50 pts → Epic
  • Naked-eye visible +8
  • Has a proper name +8
  • Binary star +6
  • Giant star +6
  • Star +3
  • Orange K-type star +3
Total score 34

16 more points to reach Epic.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Binary star · +6
  • Has a proper name · +8
  • Orange K-type star · +3
  • Giant star · +6

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 K0III — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
  • Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.

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 2.5 you can see it with your own eyes from a dark site, over in Cygnus.
  • 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 August — that's when to go looking.

Could we get there?

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

Properties

absmag
0.739
binary
yes
bv
1.021
constellation
Cyg
dist ly
72.7054
luminosity
44.0961
mag
2.48
name
Aljanah
named
yes
spect
K0III

About Aljanah

Aljanah is a rare star. It lies about 72.7 light-years from Earth, sits in the constellation Cyg, shines at apparent magnitude 2.48 and has spectral type K0III.

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 Aljanah in the constellation Cyg. At apparent magnitude 2.48, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Aljanah 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 Aljanah is a rare star

Aljanah scores 34 points on Spacedle's rarity scale, which places it in the rare tier. Another 16 points would lift it into a rarer tier.

That score comes from 6 science badges — Star, Naked-eye visible, Binary star, Has a proper name, Orange K-type star and Giant 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.