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Epic exoplanet 65 EP

HD 65216 b

RA 118.4210° · Dec -63.6467° · exoplanet

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Score breakdown

· 6 badges
65 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Two suns in its sky +12
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 65

13 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8
  • 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

  • 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.
  • Crowded system. One of at least 2 planets orbiting its star.

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 8 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.

Properties

density gcc
0.899
diameter km
173484.32
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2003
dist ly
114.5476
eccentricity
0.27
eq temp k
222.56
habitable zone
yes
host star teff
5612
insolation
0.4185
mag
7.97
mass earth
411.5899
multi star system
yes
name
HD 65216 b
orbital period days
577.6
radius earth
13.6
semi major au
1.301
spect
G5 V
sys num planets
2
sys num stars
3

Nearby objects

About HD 65216 b

HD 65216 b is an epic exoplanet. It lies about 114.5 light-years from Earth, shines at apparent magnitude 7.97, has spectral type G5 V and has an equilibrium temperature near 223 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 7.97, it is an easy target for binoculars.

Like any astronomical target, HD 65216 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 65216 b is an epic exoplanet

HD 65216 b scores 65 points on Spacedle's rarity scale, which places it in the epic tier. Another 13 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Multi-planet system, Orbits a Sun-like star 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.