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Common exoplanet 20 EP

HD 285968 b

RA 70.7354° · Dec 18.9534° · exoplanet

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Score breakdown

· 3 badges
20 pts · Common
Common 22 pts → Uncommon
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 20

2 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • Tidally locked · +10

Trivia

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. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

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 9.9 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 November — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 542.8 thousand years at Voyager 1's speed (17 km/s).

Properties

density gcc
2.04
diameter km
36100.046
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2008
dist ly
30.8884
eccentricity
0
eq temp k
450
host star teff
3703.49
insolation
5.0456
mag
9.95
mass earth
8.4
name
HD 285968 b
orbital period days
8.7836
radius earth
2.83
semi major au
0.066
spect
M2 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 285968 b

HD 285968 b is a common exoplanet. It lies about 30.9 light-years from Earth, shines at apparent magnitude 9.95, has spectral type M2 V and has an equilibrium temperature near 450 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 9.95, a small backyard telescope will bring it into view.

Like any astronomical target, HD 285968 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 285968 b is a common exoplanet

HD 285968 b scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Sub-Neptune 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.