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Epic variable star 68 EP

HR 8156

RA 321.0697° · Dec -69.7339° · star

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Score breakdown

· 7 badges
68 pts · Epic
Epic 78 pts → Anomaly
  • Carbon star (sooty red) +24
  • Bright giant +12
  • Strongly variable +10
  • Deep red star +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • A named variable star +3
Total score 68

10 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Carbon star (sooty red) · +24
  • Bright giant · +12
  • Deep red star · +8
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads C5II — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.
  • 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 6.3 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Pavo.
  • 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 August — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Properties

absmag
-1.748
bv
2.607
constellation
Pav
dist ly
1315.1451
luminosity
435.7125
mag
6.28
name
HR 8156
spect
C5II
var amplitude
0.67
var designation
Y
var max
6.064
var min
6.734

About HR 8156

HR 8156 is an epic variable star. It lies about 1,315.1 light-years from Earth, sits in the constellation Pav, shines at apparent magnitude 6.28 and has spectral type C5II.

Its spectrum reads C5II — 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 8156 in the constellation Pav. At apparent magnitude 6.28, it is an easy target for binoculars.

Like any astronomical target, HR 8156 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 8156 is an epic variable star

HR 8156 scores 68 points on Spacedle's rarity scale, which places it in the epic tier. Another 10 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), Carbon star (sooty red), Bright giant, Deep red star, Strongly variable 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.