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Epic exoplanet 56 EP

HD 63433 b

RA 117.4794° · Dec 27.3631° · exoplanet

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Score breakdown

· 7 badges
56 pts · Epic
Epic 78 pts → Anomaly
  • Denser than iron +18
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Found by TESS +4
Total score 56

22 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • Tidally locked · +10
  • Denser than iron · +18
  • Multi-planet system · +6
  • Found by TESS · +4
  • Orbits a Sun-like star · +8

Trivia

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • 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 6.9 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 January — that's when to go looking.

Properties

density gcc
12.998
diameter km
27298.268
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
73.0704
eccentricity
0.24
eq temp k
967.11
host star teff
5553
inclination
89.075
insolation
145.5707
mag
6.9204
mass earth
21.755
name
HD 63433 b
orbital period days
7.1079
radius earth
2.14
semi major au
0.072
spect
G5 V
sys num planets
3
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 63433 b

HD 63433 b is an epic exoplanet. It lies about 73.1 light-years from Earth, shines at apparent magnitude 6.92, has spectral type G5 V and has an equilibrium temperature near 967 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 6.92, it is an easy target for binoculars.

Like any astronomical target, HD 63433 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 63433 b is an epic exoplanet

HD 63433 b scores 56 points on Spacedle's rarity scale, which places it in the epic tier. Another 22 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Sub-Neptune, Tidally locked, Denser than iron, Multi-planet system, Found by TESS and Orbits a Sun-like star — 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.