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Common exoplanet 19 EP

HIP 86221 b

RA 264.2949° · Dec 27.8964° · exoplanet

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Score breakdown

· 3 badges
19 pts · Common
Common 22 pts → Uncommon
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 19

3 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10

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

  • 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.

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 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 June — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.452
diameter km
178586.8
discovery facility
Cerro Tololo Inter-American Observatory
discovery method
Radial Velocity
discovery year
2021
dist ly
96.1828
eccentricity
0.086
mag
9.25
mass earth
225.6582
name
HIP 86221 b
orbital period days
2.224
radius earth
14
semi major au
0.031
spect
K5 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HIP 86221 b

HIP 86221 b is a common exoplanet. It lies about 96.2 light-years from Earth, shines at apparent magnitude 9.25, has spectral type K5 V and spans roughly 14 Earth radii.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 9.25, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 86221 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 HIP 86221 b is a common exoplanet

HIP 86221 b scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Tidally locked — 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.