← Back to dex
Rare exoplanet 49 EP

HD 158259 b

RA 261.3496° · Dec 52.7905° · exoplanet

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

Computing the sky for your location…

Score breakdown

· 5 badges
49 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Richly packed system +14
  • Super-Earth +8
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
Total score 49

1 more point to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Lava world · +14
  • Richly packed system · +14
  • 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. 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 5 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 6.5 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around June — that's when to go looking.

Properties

density gcc
6.12
diameter km
16357.0201
discovery facility
Haute-Provence Observatory
discovery method
Radial Velocity
discovery year
2020
dist ly
88.2245
eq temp k
1462
host star teff
5801.89
insolation
759.183
mag
6.4791
mass earth
2.22
name
HD 158259 b
orbital period days
2.178
radius earth
1.2823
spect
G0
sys num planets
5
sys num stars
1

About HD 158259 b

HD 158259 b is a rare exoplanet. It lies about 88.2 light-years from Earth, shines at apparent magnitude 6.48, has spectral type G0 and has an equilibrium temperature near 1,462 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 6.48, it is an easy target for binoculars.

Like any astronomical target, HD 158259 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 158259 b is a rare exoplanet

HD 158259 b scores 49 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Super-Earth, Lava world, Richly packed 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.