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Epic exoplanet 54 EP

GJ 433 d

RA 173.8619° · Dec -32.5436° · exoplanet

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Score breakdown

· 5 badges
54 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
Total score 54

24 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Sub-Neptune · +5
  • Multi-planet system · +6
  • Orbits a red dwarf · +8

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.
  • 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 9.8 you'll want a small backyard telescope.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.

Properties

density gcc
2.93
diameter km
27298.268
discovery facility
Multiple Facilities
discovery method
Radial Velocity
discovery year
2020
dist ly
29.5646
eccentricity
0.07
eq temp k
279.71
habitable zone
yes
host star teff
3461
insolation
0.6312
mag
9.81
mass earth
5.223
name
GJ 433 d
orbital period days
36.059
radius earth
2.14
semi major au
0.178
spect
M2V
sys num planets
3
sys num stars
1

About GJ 433 d

GJ 433 d is an epic exoplanet. It lies about 29.6 light-years from Earth, shines at apparent magnitude 9.81, has spectral type M2V and has an equilibrium temperature near 280 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 9.81, a small backyard telescope will bring it into view.

Like any astronomical target, GJ 433 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 GJ 433 d is an epic exoplanet

GJ 433 d scores 54 points on Spacedle's rarity scale, which places it in the epic tier. Another 24 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Sub-Neptune, Multi-planet system and Orbits a red dwarf — 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.