Uncommon exoplanet 24 EP

HIP 5158 b

RA 16.5095° · Dec -22.4536° · exoplanet

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Score breakdown

· 4 badges

24 pts · Uncommon

Uncommon 33 pts → Rare

Eccentric orbit +9
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 24

9 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Eccentric orbit · +9
Multi-planet system · +6

Trivia

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 3 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 262.8 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1683 years in a starship at a tenth of light speed.
Distance. 168 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1858.

Saying hello

Say hello. A radio message and its reply would take 337 years round-trip.

Standing on it

A year here. A full year lasts just 346 Earth days.

By the numbers

Size. About 13.6× the width of Earth.
Volume. About 2515 Earths could fit inside it.
Mass. Roughly 451× Earth's mass — about 1.4 Jupiters.
Your weight. You'd weigh about 2.4× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. A frigid -53°C — colder than dry ice.

How we found it

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

Cosmic context

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

Properties

density gcc: 0.985
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 168.305
eccentricity: 0.52
eq temp k: 219.65
insolation: 0.1389
mass earth: 451
name: HIP 5158 b
orbital period days: 345.72
radius earth: 13.6
sys num planets: 2

About HIP 5158 b

HIP 5158 b is an uncommon exoplanet. It lies about 168.3 light-years from Earth, has an equilibrium temperature near 220 K, spans roughly 13.6 Earth radii and weighs about 451 Earth masses.

One of at least 2 planets orbiting its star.

How to see it

Like any astronomical target, HIP 5158 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 HIP 5158 b is an uncommon exoplanet

HIP 5158 b scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, 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.