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Epic exoplanet 52 EP

HIP 39017 b

RA 119.7666° · Dec -4.3326° · exoplanet

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Score breakdown

· 6 badges
52 pts · Epic
Epic 78 pts → Anomaly
  • Directly imaged +16
  • Long-period world +10
  • Eccentric orbit +9
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 52

26 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Eccentric orbit · +9
  • Directly imaged · +16

Trivia

What makes it special

  • Frozen world. A deep-frozen world, too far from its star's warmth for anything to stay liquid.

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 7 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 January — that's when to go looking.

Could we get there?

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

Properties

density gcc
23.9
diameter km
153074.4
discovery facility
Multiple Observatories
discovery method
Imaging
discovery year
2024
dist ly
216.3122
eccentricity
0.55
eq temp k
91.06
host star teff
7201
inclination
84
insolation
0.0115
mag
6.9608
mass earth
7500.7504
name
HIP 39017 b
orbital period days
31000
radius earth
12
semi major au
22.1
spect
A9/F0
sys num planets
1
sys num stars
1

About HIP 39017 b

HIP 39017 b is an epic exoplanet. It lies about 216.3 light-years from Earth, shines at apparent magnitude 6.96, has spectral type A9/F0 and has an equilibrium temperature near 91 K.

A deep-frozen world, too far from its star's warmth for anything to stay liquid.

How to see it

At apparent magnitude 6.96, it is an easy target for binoculars.

Like any astronomical target, HIP 39017 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 39017 b is an epic exoplanet

HIP 39017 b 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 — Confirmed exoplanet, Gas giant, Frozen world, Long-period world, Eccentric orbit and Directly imaged — 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.