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Epic exoplanet 52 EP

HD 155918 b

RA 260.5364° · Dec -75.3492° · exoplanet

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Score breakdown

· 7 badges
52 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Blasted by starlight +4
Total score 52

26 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • Lava world · +14
  • Tidally locked · +10
  • Multi-planet system · +6
  • Blasted by starlight · +4
  • 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. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.
  • Crowded system. One of at least 2 planets orbiting its star.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

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.
  • 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 June — that's when to go looking.

Properties

density gcc
2.2
diameter km
34059.054
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2022
dist ly
89.8919
eccentricity
0.194
eq temp k
1622.13
host star teff
5771.84
insolation
1153.7389
mag
7
mass earth
7.6279
name
HD 155918 b
orbital period days
1.8757
radius earth
2.67
semi major au
0.03
spect
G2V
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 155918 b

HD 155918 b is an epic exoplanet. It lies about 89.9 light-years from Earth, shines at apparent magnitude 7, has spectral type G2V and has an equilibrium temperature near 1,622 K.

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

How to see it

At apparent magnitude 7, it is an easy target for binoculars.

Like any astronomical target, HD 155918 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 155918 b is an epic exoplanet

HD 155918 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 7 science badges — Confirmed exoplanet, Sub-Neptune, Lava world, Tidally locked, Multi-planet system, Blasted by starlight 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.