Uncommon exoplanet 24 EP

HD 153557 c

RA 254.4707° · Dec 47.3679° · 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
Neptune-like +4

Total score 24

9 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Neptune-like · +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. ≈ 1 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 91.4 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 585 years in a starship at a tenth of light speed.
Distance. 58.5 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1967.

Saying hello

Say hello. A radio message and its reply would take 117 years round-trip.

Standing on it

A year here. A full year lasts just 15.3 Earth days.

By the numbers

Size. About 4.4× the width of Earth.
Volume. About 82.9 Earths could fit inside it.
Mass. About 17.5× the mass of Earth.
Your weight. You'd weigh about 0.9× your Earth weight standing here.
Temperature. A scorching 331°C on average.

How we found it

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

Cosmic context

Crowded system. One of at least 3 planets orbiting its star.

Properties

density gcc: 1.16
discovery facility: Multiple Observatories
discovery method: Radial Velocity
dist ly: 58.5163
eccentricity: 0.511
eq temp k: 604.33
insolation: 22.2262
mass earth: 17.4806
name: HD 153557 c
orbital period days: 15.2702
radius earth: 4.36
sys num planets: 3

About HD 153557 c

HD 153557 c is an uncommon exoplanet. It lies about 58.5 light-years from Earth, has an equilibrium temperature near 604 K, spans roughly 4.36 Earth radii and weighs about 17.48 Earth masses.

One of at least 3 planets orbiting its star.

How to see it

Like any astronomical target, HD 153557 c 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 153557 c is an uncommon exoplanet

HD 153557 c 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, Neptune-like, 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.