Rare exoplanet 36 EP

HD 166724 b

RA 273.4989° · Dec -42.5757° · exoplanet

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Score breakdown

· 5 badges

36 pts · Rare

Rare 46 pts → Epic

Long-period world +10
Eccentric orbit +9
Frozen world +8
Confirmed exoplanet +5
Gas giant +4

Total score 36

10 more points to reach Epic.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Frozen world · +8
Long-period world · +10
Eccentric orbit · +9

Trivia

What makes it special

Frozen world. A deep-frozen world far from its star's warmth.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 2.6 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 229.9 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1472 years in a starship at a tenth of light speed.
Distance. 147 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1879.

Saying hello

Say hello. A radio message and its reply would take 294 years round-trip.

Standing on it

A year here. A full year lasts about 14.1 Earth years.

By the numbers

Size. About 13× the width of Earth.
Volume. About 2197 Earths could fit inside it.
Mass. Roughly 1208× Earth's mass — about 3.8 Jupiters.
Your weight. You'd weigh about 7.1× your Earth weight standing here.
Temperature. A frigid -178°C — colder than dry ice.

How we found it

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

Properties

density gcc: 3.02
discovery facility: La Silla Observatory
discovery method: Radial Velocity
dist ly: 147.2079
eccentricity: 0.734
eq temp k: 94.83
insolation: 0.0105
mass earth: 1207.7479
name: HD 166724 b
orbital period days: 5144
radius earth: 13
sys num planets: 1

About HD 166724 b

HD 166724 b is a rare exoplanet. It lies about 147.2 light-years from Earth, has an equilibrium temperature near 95 K, spans roughly 13 Earth radii and weighs about 1,207.75 Earth masses.

A deep-frozen world far from its star's warmth.

How to see it

Like any astronomical target, HD 166724 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 166724 b is a rare exoplanet

HD 166724 b scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 10 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world 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.