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Epic variable star 51 EP

GL Gl 644A

RA 253.8698° · Dec -8.3363° · star

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Score breakdown

· 9 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Nearby (<25 ly) +12
  • Deep red star +8
  • Binary star +6
  • Red dwarf +6
  • Variable star +5
  • Cool red M-type star +5
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 51

27 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Nearby (<25 ly) · +12
  • Binary star · +6
  • 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 M3Ve — 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 9 you'll want a small backyard telescope, over in Ophiuchus.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around June — that's when to go looking.

Properties

absmag
10.06
binary
yes
bv
1.553
constellation
Oph
dist ly
20.2067
luminosity
0.0082
mag
9.02
name
GL Gl 644A
spect
M3Ve
var amplitude
0.08
var designation
V1054
var max
8.977
var min
9.057

About GL Gl 644A

GL Gl 644A is an epic variable star. It lies about 20.2 light-years from Earth, sits in the constellation Oph, shines at apparent magnitude 9.02 and has spectral type M3Ve.

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 644A in the constellation Oph. At apparent magnitude 9.02, a small backyard telescope will bring it into view.

Like any astronomical target, GL Gl 644A 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 644A is an epic variable star

GL Gl 644A scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 9 science badges — Variable star, Nearby (<25 ly), Binary star, 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.