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Rare exoplanet 47 EP

HD 216435 b

RA 343.4095° · Dec -48.5986° · 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.

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

  • 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. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

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. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Properties

density gcc
0.856
diameter km
174759.94
discovery facility
Anglo-Australian Telescope
discovery method
Radial Velocity
discovery year
2002
dist ly
107.5773
eccentricity
0.07
eq temp k
242.57
habitable zone
yes
host star teff
5999
insolation
0.5501
mag
6.03
mass earth
400.4
name
HD 216435 b
orbital period days
1311
radius earth
13.7
semi major au
2.56
spect
G0 V
sys num planets
1
sys num stars
1

Nearby objects

About HD 216435 b

HD 216435 b is a rare exoplanet. It lies about 107.6 light-years from Earth, shines at apparent magnitude 6.03, has spectral type G0 V and has an equilibrium temperature near 243 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 6.03, it is an easy target for binoculars.

Like any astronomical target, HD 216435 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 216435 b is a rare exoplanet

HD 216435 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.