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Epic exoplanet 60 EP

HD 93351 b

RA 161.6779° · Dec -1.6886° · exoplanet

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Score breakdown

· 7 badges
60 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Tidally locked +10
  • Eccentric orbit +9
  • Super-Earth +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 60

18 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Lava world · +14
  • Eccentric orbit · +9
  • Tidally locked · +10
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

Trivia

What makes it special

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

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • Crowded system. One of at least 2 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 9.1 you'll want a small backyard telescope.
  • 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 March — that's when to go looking.

Properties

density gcc
3.98
diameter km
21557.978
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2022
dist ly
183.179
eccentricity
0.549
eq temp k
1330.76
host star teff
5408
insolation
522.5845
mag
9.12
mass earth
3.4961
name
HD 93351 b
orbital period days
2.4595
radius earth
1.69
semi major au
0.035
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 93351 b

HD 93351 b is an epic exoplanet. It lies about 183.2 light-years from Earth, shines at apparent magnitude 9.12, has an equilibrium temperature near 1,331 K and spans roughly 1.69 Earth radii.

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

How to see it

At apparent magnitude 9.12, a small backyard telescope will bring it into view.

Like any astronomical target, HD 93351 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 93351 b is an epic exoplanet

HD 93351 b scores 60 points on Spacedle's rarity scale, which places it in the epic tier. Another 18 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Super-Earth, Lava world, Eccentric orbit, Tidally locked, Multi-planet system 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.