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Epic variable star 50 EP

48 Lib

RA 239.5474° · Dec -14.2794° · star

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Score breakdown

· 8 badges
50 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Naked-eye visible +8
  • Hot blue B-type star +6
  • Variable star +5
  • Blue-white star +5
  • On the zodiac +3
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 50

28 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • On the zodiac · +3
  • Hot blue B-type star · +6
  • Supergiant · +18
  • Blue-white star · +5
  • Barely variable (under 0.05 mag) · +2
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads B8Ia/Iab — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
  • Where it is in life. It is a luminous supergiant — among the largest and rarest stars in the galaxy.
  • 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 5 you can see it with your own eyes from a dark site, over in Libra.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around May — that's when to go looking.

Could we get there?

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

Properties

absmag
-0.834
bv
-0.08
constellation
Lib
dist ly
467.9425
luminosity
187.7587
mag
4.95
name
48 Lib
spect
B8Ia/Iab
var amplitude
0.05
var designation
FX
var max
4.926
var min
4.976

About 48 Lib

48 Lib is an epic variable star. It lies about 467.9 light-years from Earth, sits in the constellation Lib, shines at apparent magnitude 4.95 and has spectral type B8Ia/Iab.

Its spectrum reads B8Ia/Iab — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for 48 Lib in the constellation Lib. At apparent magnitude 4.95, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 48 Lib 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 48 Lib is an epic variable star

48 Lib scores 50 points on Spacedle's rarity scale, which places it in the epic tier. Another 28 points would lift it into a rarer tier.

That score comes from 8 science badges — Variable star, Naked-eye visible, On the zodiac, Hot blue B-type star, Supergiant, Blue-white star, Barely variable (under 0.05 mag) 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.