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Epic variable star 75 EP

The Mus

RA 197.0298° · Dec -65.3060° · star

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Score breakdown

· 7 badges
75 pts · Epic
Epic 78 pts → Anomaly
  • Wolf-Rayet star (shedding itself) +34
  • Supergiant +18
  • Naked-eye visible +8
  • Variable star +5
  • Blue-white star +5
  • A named variable star +3
  • Barely variable (under 0.05 mag) +2
Total score 75

3 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Wolf-Rayet star (shedding itself) · +34
  • 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 WC6 + O9.5I — a Wolf-Rayet star: a stellar monster shedding its own outer layers in a ferocious wind, on its way to a supernova.
  • 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.

Find it in the sky

  • How to spot it. At magnitude 5.4 you can see it with your own eyes from a dark site, over in Musca.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out blue-white (B−V -0) — the hallmark of a surface far hotter than the Sun's.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 10560 K, against the Sun's 5778 K.

Properties

absmag
-14.56
bv
-0.033
constellation
Mus
luminosity
58076441.7521
mag
5.44
name
The Mus
spect
WC6 + O9.5I
var amplitude
0.04
var designation
The
var max
5.418
var min
5.458

About The Mus

The Mus is an epic variable star. It sits in the constellation Mus, shines at apparent magnitude 5.44 and has spectral type WC6 + O9.5I.

Its spectrum reads WC6 + O9.5I — a Wolf-Rayet star: a stellar monster shedding its own outer layers in a ferocious wind, on its way to a supernova.

How to see it

Look for The Mus in the constellation Mus. At apparent magnitude 5.44, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, The Mus 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 The Mus is an epic variable star

The Mus scores 75 points on Spacedle's rarity scale, which places it in the epic tier. Another 3 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Wolf-Rayet star (shedding itself), 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.