← Back to dex
Trash exoplanet 9 EP

HD 212771 b

RA 336.7624° · Dec -17.2641° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 2 badges
9 pts · Trash
Trash 15 pts → Common
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 9

6 more points to reach Common.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4

Trivia

What it actually is

  • 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. 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 7.6 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 August — 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. ≈ 6.4 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 566.1 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
1.77
diameter km
169657.46
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
362.5387
eccentricity
0.076
eq temp k
507.69
host star teff
5003
insolation
10.8749
mag
7.6
mass earth
759.6137
name
HD 212771 b
orbital period days
380.7
radius earth
13.3
semi major au
1.19
spect
G8 IV
sys num planets
1
sys num stars
1

About HD 212771 b

HD 212771 b is a trash exoplanet. It lies about 362.5 light-years from Earth, shines at apparent magnitude 7.6, has spectral type G8 IV and has an equilibrium temperature near 508 K.

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.

How to see it

At apparent magnitude 7.6, it is an easy target for binoculars.

Like any astronomical target, HD 212771 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 212771 b is a trash exoplanet

HD 212771 b scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.

That score comes from 2 science badges — Confirmed exoplanet 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.