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Common exoplanet 15 EP

HD 216536 b

RA 343.2666° · Dec 44.4777° · exoplanet

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Score breakdown

· 3 badges
15 pts · Common
Common 22 pts → Uncommon
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 15

7 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4

Trivia

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.

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 9.2 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • 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. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 21.6 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
0.698
diameter km
176035.56
discovery facility
McDonald Observatory
discovery method
Radial Velocity
discovery year
2015
dist ly
1227.1065
eccentricity
0.38
eq temp k
897.99
host star teff
4639
insolation
169.5666
mag
9.229
mass earth
333.7215
name
HD 216536 b
orbital period days
148.6
radius earth
13.8
semi major au
0.61
spect
K0
sys num planets
1
sys num stars
1

Nearby objects

About HD 216536 b

HD 216536 b is a common exoplanet. It lies about 1,227.1 light-years from Earth, shines at apparent magnitude 9.23, has spectral type K0 and has an equilibrium temperature near 898 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 9.23, a small backyard telescope will bring it into view.

Like any astronomical target, HD 216536 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 216536 b is a common exoplanet

HD 216536 b scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Distant (over 1,000 light-years) and Gas giant — 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.