Uncommon exoplanet 28 EP

HD 20794 d

RA 49.9998° · Dec -43.0667° · exoplanet

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Score breakdown

· 4 badges

28 pts · Uncommon

Uncommon 33 pts → Rare

Nearby (<25 ly) +12
Multi-planet system +6
Confirmed exoplanet +5
Sub-Neptune +5

Total score 28

5 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Sub-Neptune · +5
Multi-planet system · +6
Nearby (<25 ly) · +12

Trivia

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 344 thousand years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 30.6 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 196 years in a starship at a tenth of light speed.
Distance. 19.6 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 2006.

Saying hello

Say hello. A radio message and its reply would take 39.2 years round-trip.

Standing on it

A year here. A full year lasts just 89.7 Earth days.

By the numbers

Size. About 2× the width of Earth.
Volume. About 8.5 Earths could fit inside it.
Mass. About 4.8× the mass of Earth.
Your weight. You'd weigh about 1.2× your Earth weight standing here.
Temperature. A scorching 115°C on average.

How we found it

Discovery. Found by La Silla Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 4 planets orbiting its star.

Properties

density gcc: 3.11
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 19.5784
eccentricity: 0.077
eq temp k: 388
insolation: 5.2273
mass earth: 4.8
name: HD 20794 d
orbital period days: 89.68
radius earth: 2.04
sys num planets: 4

About HD 20794 d

HD 20794 d is an uncommon exoplanet. It lies about 19.6 light-years from Earth, has an equilibrium temperature near 388 K, spans roughly 2.04 Earth radii and weighs about 4.8 Earth masses.

One of at least 4 planets orbiting its star.

How to see it

Like any astronomical target, HD 20794 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 20794 d is an uncommon exoplanet

HD 20794 d scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Sub-Neptune, Multi-planet system and Nearby (<25 ly) — 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.