Uncommon exoplanet 25 EP

HD 156098 c

RA 259.2647° · Dec -32.6631° · exoplanet

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Score breakdown

· 4 badges

25 pts · Uncommon

Uncommon 33 pts → Rare

Long-period world +10
Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 25

8 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Long-period world · +10
Multi-planet system · +6

Trivia

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 2.8 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 245.7 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1574 years in a starship at a tenth of light speed.
Distance. 157 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1869.

Saying hello

Say hello. A radio message and its reply would take 315 years round-trip.

Standing on it

A year here. A full year lasts about 21.5 Earth years.

By the numbers

Size. About 12.8× the width of Earth.
Volume. About 2097 Earths could fit inside it.
Mass. Roughly 1662× Earth's mass — about 5.2 Jupiters.
Your weight. You'd weigh about 10.1× your Earth weight standing here.
Temperature. A frigid -96°C — colder than dry ice.

How we found it

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

Cosmic context

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

Properties

density gcc: 4.35
discovery facility: Multiple Observatories
discovery method: Radial Velocity
dist ly: 157.367
eccentricity: 0.391
eq temp k: 177.18
insolation: 0.1642
mass earth: 1661.6069
name: HD 156098 c
orbital period days: 7841.5839
radius earth: 12.8
sys num planets: 2

About HD 156098 c

HD 156098 c is an uncommon exoplanet. It lies about 157.4 light-years from Earth, has an equilibrium temperature near 177 K, spans roughly 12.8 Earth radii and weighs about 1,661.61 Earth masses.

One of at least 2 planets orbiting its star.

How to see it

Like any astronomical target, HD 156098 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 156098 c is an uncommon exoplanet

HD 156098 c scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 8 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Long-period world 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.