← Back to dex
Uncommon exoplanet 25 EP

HD 73256 c

RA 129.0950° · Dec -30.0373° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 4 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 25

9 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Orbits a Sun-like star · +8

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 8.1 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 January — that's when to go looking.

Could we get there?

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

Properties

density gcc
15.4
diameter km
155625.64
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2023
dist ly
119.7253
eccentricity
0.16
eq temp k
133.92
host star teff
5570
inclination
29
insolation
0.0511
mag
8.08
mass earth
5085.2545
name
HD 73256 c
orbital period days
2690
radius earth
12.2
semi major au
3.8
spect
G8 IV
sys num planets
1
sys num stars
1

About HD 73256 c

HD 73256 c is an uncommon exoplanet. It lies about 119.7 light-years from Earth, shines at apparent magnitude 8.08, has spectral type G8 IV and has an equilibrium temperature near 134 K.

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

How to see it

At apparent magnitude 8.08, it is an easy target for binoculars.

Like any astronomical target, HD 73256 c 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 73256 c is an uncommon exoplanet

HD 73256 c scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Frozen world and Orbits a Sun-like 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.