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Epic variable star 52 EP

HR 4153

RA 158.8036° · Dec -39.5626° · star

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Score breakdown

· 6 badges
52 pts · Epic
Epic 78 pts → Anomaly
  • Carbon star (sooty red) +24
  • Naked-eye visible +8
  • Deep red star +8
  • Variable star +5
  • Gently variable +4
  • A named variable star +3
Total score 52

26 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Carbon star (sooty red) · +24
  • Deep red star · +8
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads C — 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.

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 5.5 you can see it with your own eyes from a dark site, over in Antlia.
  • 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 February — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 15.4 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-1.641
bv
3.015
constellation
Ant
dist ly
874.4128
luminosity
394.8208
mag
5.5
name
HR 4153
spect
C
var amplitude
0.44
var designation
U
var max
5.386
var min
5.826

About HR 4153

HR 4153 is an epic variable star. It lies about 874.4 light-years from Earth, sits in the constellation Ant, shines at apparent magnitude 5.5 and has spectral type C.

Its spectrum reads C — 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 4153 in the constellation Ant. At apparent magnitude 5.5, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 4153 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 4153 is an epic variable star

HR 4153 scores 52 points on Spacedle's rarity scale, which places it in the epic tier. Another 26 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Naked-eye visible, Carbon star (sooty red), Deep red star, Gently 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.