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Epic variable star 66 EP

HR 5880

RA 237.1434° · Dec 28.1567° · star

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Score breakdown

· 6 badges
66 pts · Epic
Epic 78 pts → Anomaly
  • Carbon star (sooty red) +24
  • Fades out of naked-eye view +16
  • Strongly variable +10
  • Naked-eye visible +8
  • Variable star +5
  • A named variable star +3
Total score 66

12 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Carbon star (sooty red) · +24
  • Strongly variable · +10
  • Fades out of naked-eye view · +16
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads C00 (F8pe) — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • 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 5.9 you can see it with your own eyes from a dark site, over in Corona Borealis.
  • 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 May — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out yellow (B−V 0.6) — almost exactly the Sun's own shade — a stellar twin in colour, if not in size.
  • 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 5940 K, against the Sun's 5778 K.

Properties

absmag
-14.11
bv
0.608
constellation
CrB
luminosity
38370724.5492
mag
5.89
name
HR 5880
spect
C00 (F8pe)
var amplitude
0.56
var designation
R
var max
5.727
var min
6.287

About HR 5880

HR 5880 is an epic variable star. It sits in the constellation CrB, shines at apparent magnitude 5.89 and has spectral type C00 (F8pe).

Its spectrum reads C00 (F8pe) — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.

How to see it

Look for HR 5880 in the constellation CrB. At apparent magnitude 5.89, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 5880 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 HR 5880 is an epic variable star

HR 5880 scores 66 points on Spacedle's rarity scale, which places it in the epic tier. Another 12 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Naked-eye visible, Carbon star (sooty red), Strongly variable, Fades out of naked-eye view 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.