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Common exoplanet 21 EP

HD 101930 b

RA 175.8756° · Dec -58.0054° · exoplanet

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Score breakdown

· 3 badges
21 pts · Common
Common 22 pts → Uncommon
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 21

1 more point to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Two suns in its sky · +12

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 8.2 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 March — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.367
diameter km
135215.72
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2005
dist ly
97.9362
eccentricity
0.11
eq temp k
417.04
host star teff
5108
insolation
5.4444
mag
8.21
mass earth
79.4575
multi star system
yes
name
HD 101930 b
orbital period days
70.46
radius earth
10.6
semi major au
0.3
spect
K1 V
sys num planets
1
sys num stars
2

Nearby objects

About HD 101930 b

HD 101930 b is a common exoplanet. It lies about 97.9 light-years from Earth, shines at apparent magnitude 8.21, has spectral type K1 V and has an equilibrium temperature near 417 K.

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 8.21, it is an easy target for binoculars.

Like any astronomical target, HD 101930 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 101930 b is a common exoplanet

HD 101930 b scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

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