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Common exoplanet 21 EP

HD 215152 b

RA 340.8381° · Dec -6.4021° · exoplanet

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Score breakdown

· 3 badges
21 pts · Common
Common 22 pts → Uncommon
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 21

1 more point to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • 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.
  • Crowded system. One of at least 4 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 8.1 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 August — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 1.2 million years at Voyager 1's speed (17 km/s).

Properties

discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2018
dist ly
70.4412
eccentricity
0
eq temp k
846.89
host star teff
4935
inclination
0.1871
insolation
90.3745
mag
8.11
mass earth
565.4167
name
HD 215152 b
orbital period days
5.76
semi major au
0.0576
spect
K3 V
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

Nearby objects

About HD 215152 b

HD 215152 b is a common exoplanet. It lies about 70.4 light-years from Earth, shines at apparent magnitude 8.11, has spectral type K3 V and has an equilibrium temperature near 847 K.

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 8.11, it is an easy target for binoculars.

Like any astronomical target, HD 215152 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 215152 b is a common exoplanet

HD 215152 b scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, 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.