About 81 Cet b
81 Cet b is a trash exoplanet. It lies about 330.3 light-years from Earth, has an equilibrium temperature near 527 K, spans roughly 13.1 Earth radii and weighs about 1,051.06 Earth masses.
About 13.1× the width of Earth.
Trash exoplanet 9 EP
81 Cet b
RA 39.4244° · Dec -3.3964° · exoplanet
Score breakdown
· 2 badgesTrash 15 pts → Common
- Confirmed exoplanet +5
- Gas giant +4
Total score 9
6 more points to reach Common.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 5.8 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 515.7 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 3303 years in a starship at a tenth of light speed.
- Distance. 330 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1696.
Saying hello
- Say hello. A radio message and its reply would take 661 years round-trip.
Standing on it
- A year here. A full year lasts about 2.8 Earth years.
By the numbers
- Size. About 13.1× the width of Earth.
- Volume. About 2248 Earths could fit inside it.
- Mass. Roughly 1051× Earth's mass — about 3.3 Jupiters.
- Your weight. You'd weigh about 6.1× your Earth weight standing here.
- Temperature. A scorching 254°C on average.
How we found it
- Discovery. Found by Okayama Astrophysical Observatory using the radial velocity method.
Properties
- density gcc
- 2.57
- discovery facility
- Okayama Astrophysical Observatory
- discovery method
- Radial Velocity
- dist ly
- 330.2656
- eccentricity
- 0.037
- eq temp k
- 526.92
- insolation
- 13.0071
- mass earth
- 1051.0585
- name
- 81 Cet b
- orbital period days
- 1005.57
- radius earth
- 13.1
- sys num planets
- 1
How to see it
Like any astronomical target, 81 Cet 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 81 Cet b is a trash exoplanet
81 Cet b scores 9 points on Spacedle's rarity scale, which places it in the trash tier. Another 6 points would lift it into a rarer tier.
That score comes from 2 science badges — Confirmed exoplanet and Gas giant — 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.