Epic exoplanet 48 EP

HD 128356 b

RA 219.2703° · Dec -25.8032° · exoplanet

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Score breakdown

· 4 badges

48 pts · Epic

Epic 68 pts → Anomaly

In the habitable zone +30
Eccentric orbit +9
Confirmed exoplanet +5
Gas giant +4

Total score 48

20 more points to reach Anomaly.

Badges

Confirmed exoplanet · +5
In the habitable zone · +30
Gas giant · +4
Eccentric orbit · +9

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. ≈ 1.5 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 133.2 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 853 years in a starship at a tenth of light speed.
Distance. 85.3 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1941.

Saying hello

Say hello. A radio message and its reply would take 171 years round-trip.

Standing on it

A year here. A full year lasts just 298 Earth days.

By the numbers

Size. About 13.9× the width of Earth.
Volume. About 2686 Earths could fit inside it.
Mass. Roughly 283× Earth's mass — about 0.9 Jupiters.
Your weight. You'd weigh about 1.5× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. A frigid -41°C — colder than dry ice.

How we found it

Discovery. Found by Multiple Observatories using the radial velocity method.

Properties

density gcc: 0.579
discovery facility: Multiple Observatories
discovery method: Radial Velocity
dist ly: 85.3054
eccentricity: 0.57
eq temp k: 232.36
habitable zone: yes
insolation: 0.4756
mass earth: 282.8687
name: HD 128356 b
orbital period days: 298.2
radius earth: 13.9
sys num planets: 1

About HD 128356 b

HD 128356 b is an epic exoplanet. It lies about 85.3 light-years from Earth, has an equilibrium temperature near 232 K, spans roughly 13.9 Earth radii and weighs about 282.87 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 128356 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 128356 b is an epic exoplanet

HD 128356 b scores 48 points on Spacedle's rarity scale, which places it in the epic tier. Another 20 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, In the habitable zone, Gas giant and Eccentric orbit — 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.