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Uncommon exoplanet 27 EP

HD 125271 b

RA 216.6474° · Dec -81.4543° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Long-period world +10
  • Frozen world +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10

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 9.7 you'll want a small backyard telescope.
  • 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 April — that's when to go looking.

Could we get there?

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

Properties

density gcc
9.99
diameter km
158176.88
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2022
dist ly
128.3313
eccentricity
0.165
eq temp k
59.78
host star teff
4703.93
inclination
93.088
insolation
0.0021
mag
9.68
mass earth
3465.6009
name
HD 125271 b
orbital period days
14901.9929
radius earth
12.4
semi major au
10.817
sys num planets
1
sys num stars
1

About HD 125271 b

HD 125271 b is an uncommon exoplanet. It lies about 128.3 light-years from Earth, shines at apparent magnitude 9.68, has an equilibrium temperature near 60 K and spans roughly 12.4 Earth radii.

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

How to see it

At apparent magnitude 9.68, a small backyard telescope will bring it into view.

Like any astronomical target, HD 125271 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 HD 125271 b is an uncommon exoplanet

HD 125271 b scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Frozen world and Long-period world — 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.