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Rare exoplanet 47 EP

HD 216437 b

RA 343.6640° · Dec -70.0734° · exoplanet

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Score breakdown

· 4 badges
47 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 47

3 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Orbits a Sun-like star · +8

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.

What it actually is

  • 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.
  • 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 6 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 September — that's when to go looking.

Could we get there?

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

Properties

density gcc
3.34
diameter km
165830.6
discovery facility
Anglo-Australian Telescope
discovery method
Radial Velocity
discovery year
2002
dist ly
87.0517
eccentricity
0.31
eq temp k
209.85
habitable zone
yes
host star teff
5909
inclination
148
insolation
0.3389
mag
6.04
mass earth
1334.8793
name
HD 216437 b
orbital period days
1359
radius earth
13
semi major au
2.57
spect
G1 V
sys num planets
1
sys num stars
1

Nearby objects

About HD 216437 b

HD 216437 b is a rare exoplanet. It lies about 87.1 light-years from Earth, shines at apparent magnitude 6.04, has spectral type G1 V and has an equilibrium temperature near 210 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 6.04, it is an easy target for binoculars.

Like any astronomical target, HD 216437 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 216437 b is a rare exoplanet

HD 216437 b scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Gas giant 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.