Common exoplanet 20 EP

HD 109833 b

RA 189.7759° · Dec -74.5740° · exoplanet

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Score breakdown

· 4 badges

20 pts · Common

Common 24 pts → Uncommon

Multi-planet system +6
Confirmed exoplanet +5
Sub-Neptune +5
Found by TESS +4

Total score 20

4 more points to reach Uncommon.

Badges

Confirmed exoplanet · +5
Sub-Neptune · +5
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. ≈ 4.6 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 405.2 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 2595 years in a starship at a tenth of light speed.
Distance. 259 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1767.

Saying hello

Say hello. A radio message and its reply would take 519 years round-trip.

Standing on it

A year here. A full year lasts just 9.2 Earth days.

By the numbers

Size. About 2.9× the width of Earth.
Volume. About 24.1 Earths could fit inside it.
Mass. About 8.7× the mass of Earth.
Your weight. You'd weigh about 1.0× your Earth weight standing here.
Temperature. Around 513°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: 1.98
discovery facility: Transiting Exoplanet Survey Satellite (TESS)
discovery method: Transit
dist ly: 259.477
eccentricity: 0.18
eq temp k: 786
insolation: 63.4589
mass earth: 8.69
name: HD 109833 b
orbital period days: 9.1885
radius earth: 2.888
sys num planets: 2

About HD 109833 b

HD 109833 b is a common exoplanet. It lies about 259.5 light-years from Earth, has an equilibrium temperature near 786 K, spans roughly 2.89 Earth radii and weighs about 8.69 Earth masses.

One of at least 2 planets orbiting its star.

How to see it

Like any astronomical target, HD 109833 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 109833 b is a common exoplanet

HD 109833 b scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 4 points would lift it into a rarer tier.

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