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Trash exoplanet 11 EP

HD 7924 d

RA 20.4957° · Dec 76.7101° · exoplanet

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Score breakdown

· 2 badges
11 pts · Trash
Trash 15 pts → Common
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 11

4 more points to reach Common.

Badges

  • Confirmed exoplanet · +5
  • Multi-planet system · +6

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.
  • Crowded system. One of at least 3 planets orbiting its star.

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 7.2 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around October — 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. ≈ 973.9 thousand years at Voyager 1's speed (17 km/s).

Properties

discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2015
dist ly
55.4211
eccentricity
0.21
eq temp k
499
host star teff
5075
inclination
0.2188
insolation
15.17
mag
7.179
mass earth
1568.1654
name
HD 7924 d
orbital period days
24.451
semi major au
0.1551
spect
K0.5 V
sys num planets
3
sys num stars
1

About HD 7924 d

HD 7924 d is a trash exoplanet. It lies about 55.4 light-years from Earth, shines at apparent magnitude 7.18, has spectral type K0.5 V and has an equilibrium temperature near 499 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 7.18, it is an easy target for binoculars.

Like any astronomical target, HD 7924 d 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 7924 d is a trash exoplanet

HD 7924 d scores 11 points on Spacedle's rarity scale, which places it in the trash tier. Another 4 points would lift it into a rarer tier.

That score comes from 2 science badges — Confirmed exoplanet and Multi-planet system — 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.