Uncommon exoplanet 31 EP

HD 101581 b

RA 175.2563° · Dec -44.4041° · exoplanet

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Score breakdown

· 4 badges

31 pts · Uncommon

Uncommon 33 pts → Rare

Earth-sized +16
Multi-planet system +6
Confirmed exoplanet +5
Found by TESS +4

Total score 31

2 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Earth-sized · +16
Multi-planet system · +6
Found by TESS · +4

Trivia

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 732.4 thousand years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 65.1 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 417 years in a starship at a tenth of light speed.
Distance. 41.7 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1984.

Saying hello

Say hello. A radio message and its reply would take 83.4 years round-trip.

Standing on it

A year here. A full year lasts just 4.5 Earth days.

By the numbers

Size. Almost exactly Earth-sized.
Mass. About 0.8× the mass of Earth.
Your weight. You'd weigh about 0.9× your Earth weight standing here.
Temperature. Around 561°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by Transiting Exoplanet Survey Satellite (TESS) using the transit method.

Cosmic context

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

Properties

density gcc: 5.2
discovery facility: Transiting Exoplanet Survey Satellite (TESS)
discovery method: Transit
dist ly: 41.6765
eq temp k: 834
insolation: 80
mass earth: 0.827
name: HD 101581 b
orbital period days: 4.4657
radius earth: 0.956
sys num planets: 2

About HD 101581 b

HD 101581 b is an uncommon exoplanet. It lies about 41.7 light-years from Earth, has an equilibrium temperature near 834 K, spans roughly 0.96 Earth radii and weighs about 0.83 Earth masses.

One of at least 2 planets orbiting its star.

How to see it

Like any astronomical target, HD 101581 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 101581 b is an uncommon exoplanet

HD 101581 b scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Earth-sized, Multi-planet system and Found by TESS — 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.