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Rare variable star 43 EP

GL Gl 22A

RA 8.1159° · Dec 67.2357° · star

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Score breakdown

· 9 badges
43 pts · Rare
Rare 50 pts → Epic
  • Deep red star +8
  • Binary star +6
  • Red dwarf +6
  • Variable star +5
  • Cool red M-type star +5
  • Never sets (northern circumpolar) +4
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 43

7 more points to reach Epic.

Badges

  • Variable star · +5
  • Binary star · +6
  • Never sets (northern circumpolar) · +4
  • Cool red M-type star · +5
  • Main-sequence star · +2
  • Deep red star · +8
  • Red dwarf · +6
  • Gently variable · +4
  • 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 M2.5Ve — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
  • 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. 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 10.3 you'll want a small backyard telescope, over in Cassiopeia.
  • 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 September — that's when to go looking.

Properties

absmag
10.256
binary
yes
bv
1.52
constellation
Cas
dist ly
32.8289
luminosity
0.0069
mag
10.27
name
GL Gl 22A
spect
M2.5Ve
var amplitude
0.23
var designation
V547
var max
10.204
var min
10.434

About GL Gl 22A

GL Gl 22A is a rare variable star. It lies about 32.8 light-years from Earth, sits in the constellation Cas, shines at apparent magnitude 10.27 and has spectral type M2.5Ve.

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 Gl 22A in the constellation Cas. At apparent magnitude 10.27, a small backyard telescope will bring it into view.

Like any astronomical target, GL Gl 22A 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 Gl 22A is a rare variable star

GL Gl 22A scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.

That score comes from 9 science badges — Variable star, Binary star, Never sets (northern circumpolar), Cool red M-type star, Main-sequence star, Deep red star, Red dwarf and Gently variable — 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.