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Epic exoplanet 61 EP

HIP 21152 b

RA 68.0205° · Dec 5.4101° · exoplanet

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Score breakdown

· 6 badges
61 pts · Epic
Epic 78 pts → Anomaly
  • Directly imaged +16
  • Lava world +14
  • Two suns in its sky +12
  • Long-period world +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 61

17 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Long-period world · +10
  • Directly imaged · +16
  • Two suns in its sky · +12

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 6.4 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around November — that's when to go looking.

Could we get there?

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

Properties

density gcc
24.3
diameter km
153074.4
discovery facility
Multiple Observatories
discovery method
Imaging
discovery year
2022
dist ly
141.5755
eccentricity
0.36
eq temp k
1300
host star teff
6655
inclination
95.3
insolation
0.015
mag
6.3701
mass earth
7627.8818
multi star system
yes
name
HIP 21152 b
orbital period days
22000
radius earth
12
semi major au
17
spect
F5 V
sys num planets
1
sys num stars
2

About HIP 21152 b

HIP 21152 b is an epic exoplanet. It lies about 141.6 light-years from Earth, shines at apparent magnitude 6.37, has spectral type F5 V and has an equilibrium temperature near 1,300 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 6.37, it is an easy target for binoculars.

Like any astronomical target, HIP 21152 b 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 HIP 21152 b is an epic exoplanet

HIP 21152 b scores 61 points on Spacedle's rarity scale, which places it in the epic tier. Another 17 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Lava world, Long-period world, Directly imaged and Two suns in its sky — 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.