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Epic exoplanet 51 EP

HD 20794 b

RA 49.9998° · Dec -43.0667° · exoplanet

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Score breakdown

· 6 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Nearby (<25 ly) +12
  • Its star is visible to the naked eye +12
  • Super-Earth +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
Total score 51

27 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Nearby (<25 ly) · +12
  • Super-Earth · +8
  • Multi-planet system · +6
  • Its star is visible to the naked eye · +12
  • Orbits a Sun-like star · +8

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • Crowded system. One of at least 4 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 4.3 you can see it with your own eyes from a dark site.
  • 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 November — that's when to go looking.

Could we get there?

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

Properties

density gcc
4.87
diameter km
18496.49
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2011
dist ly
19.5784
eccentricity
0.064
eq temp k
660
host star teff
5368
inclination
90
insolation
43.4733
mag
4.26
mass earth
2.7
name
HD 20794 b
orbital period days
18.314
radius earth
1.45
semi major au
0.1257
spect
G6 V
sys num planets
4
sys num stars
1

About HD 20794 b

HD 20794 b is an epic exoplanet. It lies about 19.6 light-years from Earth, shines at apparent magnitude 4.26, has spectral type G6 V and has an equilibrium temperature near 660 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 4.26, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HD 20794 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 20794 b is an epic exoplanet

HD 20794 b scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Nearby (<25 ly), Super-Earth, Multi-planet system, Its star is visible to the naked eye 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.