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Epic exoplanet 51 EP

HD 147379 b

RA 244.1726° · Dec 67.2392° · exoplanet

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Score breakdown

· 4 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Neptune-like +4
Total score 51

27 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Neptune-like · +4
  • Two suns in its sky · +12

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.

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 8.6 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.

Properties

density gcc
0.985
diameter km
63015.628
discovery facility
Calar Alto Observatory
discovery method
Radial Velocity
discovery year
2017
dist ly
35.1084
eccentricity
0.063
eq temp k
276.66
habitable zone
yes
host star teff
4090
insolation
0.7847
mag
8.61
mass earth
21.6
multi star system
yes
name
HD 147379 b
orbital period days
86.58
radius earth
4.94
semi major au
0.3193
spect
M0.0 V
sys num planets
1
sys num stars
2

Nearby objects

About HD 147379 b

HD 147379 b is an epic exoplanet. It lies about 35.1 light-years from Earth, shines at apparent magnitude 8.61, has spectral type M0.0 V and has an equilibrium temperature near 277 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 8.61, it is an easy target for binoculars.

Like any astronomical target, HD 147379 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 147379 b is an epic exoplanet

HD 147379 b scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Neptune-like and Two suns in its sky — 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.