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Uncommon exoplanet 29 EP

HIP 29442 c

RA 93.0578° · Dec -14.6493° · exoplanet

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Score breakdown

· 4 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 29

5 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10
  • Multi-planet system · +6

Trivia

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • Crowded system. One of at least 3 planets orbiting its star.

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

Could we get there?

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

Properties

density gcc
6.3
diameter km
19784.8662
discovery facility
Paranal Observatory
discovery method
Radial Velocity
discovery year
2023
dist ly
222.4123
eq temp k
1123
host star teff
5289
inclination
86.3
insolation
451
mag
9.49
mass earth
4.5
name
HIP 29442 c
orbital period days
3.538
radius earth
1.551
semi major au
0.0452
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HIP 29442 c

HIP 29442 c is an uncommon exoplanet. It lies about 222.4 light-years from Earth, shines at apparent magnitude 9.49, has an equilibrium temperature near 1,123 K and spans roughly 1.55 Earth radii.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 9.49, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 29442 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 HIP 29442 c is an uncommon exoplanet

HIP 29442 c scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, Tidally locked and Multi-planet system — 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.