Epic exoplanet 54 EP

HD 4203 b

RA 11.1722° · Dec 20.4484° · exoplanet

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Score breakdown

· 5 badges

54 pts · Epic

Epic 68 pts → Anomaly

In the habitable zone +30
Eccentric orbit +9
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 54

14 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
In the habitable zone · +30
Gas giant · +4
Eccentric orbit · +9
Multi-planet system · +6

Trivia

What makes it special

Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 4.7 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 414.4 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 2654 years in a starship at a tenth of light speed.
Distance. 265 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1761.

Saying hello

Say hello. A radio message and its reply would take 531 years round-trip.

Standing on it

A year here. A full year lasts just 432 Earth days.

By the numbers

Size. About 13.3× the width of Earth.
Volume. About 2353 Earths could fit inside it.
Mass. Roughly 709× Earth's mass — about 2.2 Jupiters.
Your weight. You'd weigh about 4.0× your Earth weight standing here.
Temperature. A surprisingly temperate 24°C average.

How we found it

Discovery. Found by W. M. Keck Observatory using the radial velocity method.

Cosmic context

Crowded system. One of at least 2 planets orbiting its star.

Properties

density gcc: 1.66
discovery facility: W. M. Keck Observatory
discovery method: Radial Velocity
dist ly: 265.4241
eccentricity: 0.52
eq temp k: 297.28
habitable zone: yes
insolation: 1.4338
mass earth: 708.7609
name: HD 4203 b
orbital period days: 431.88
radius earth: 13.3
sys num planets: 2

About HD 4203 b

HD 4203 b is an epic exoplanet. It lies about 265.4 light-years from Earth, has an equilibrium temperature near 297 K, spans roughly 13.3 Earth radii and weighs about 708.76 Earth masses.

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

How to see it

Like any astronomical target, HD 4203 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 4203 b is an epic exoplanet

HD 4203 b scores 54 points on Spacedle's rarity scale, which places it in the epic tier. Another 14 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Eccentric orbit 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.