About HD 143811 AB b
HD 143811 AB b is a rare exoplanet. It lies about 445.6 light-years from Earth, has an equilibrium temperature near 1,042 K, spans roughly 15.69 Earth radii and weighs about 1,938.75 Earth masses.
About 15.7× the width of Earth.
Rare exoplanet 45 EP
HD 143811 AB b
RA 240.8892° · Dec -30.1372° · exoplanet
Score breakdown
· 5 badgesRare 46 pts → Epic
- Directly imaged +16
- Hot Jupiter +10
- Long-period world +10
- Confirmed exoplanet +5
- Gas giant +4
Total score 45
1 more point to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Hot Jupiter · +10
- Long-period world · +10
- Directly imaged · +16
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 7.8 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 695.7 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 4456 years in a starship at a tenth of light speed.
- Distance. 446 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1580.
Saying hello
- Say hello. A radio message and its reply would take 891 years round-trip.
Standing on it
- A year here. A full year lasts about 320 Earth years.
By the numbers
- Size. About 15.7× the width of Earth.
- Volume. About 3864 Earths could fit inside it.
- Mass. Roughly 1939× Earth's mass — about 6.1 Jupiters.
- Your weight. You'd weigh about 7.9× your Earth weight standing here.
- Temperature. Around 769°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Paranal Observatory using the imaging method.
Properties
- density gcc
- 2.76
- discovery facility
- Paranal Observatory
- discovery method
- Imaging
- dist ly
- 445.5552
- eccentricity
- 0.19
- eq temp k
- 1042
- insolation
- 0.0011
- mass earth
- 1938.7533
- name
- HD 143811 AB b
- orbital period days
- 117000
- radius earth
- 15.6926
- sys num planets
- 1
How to see it
Like any astronomical target, HD 143811 AB 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 143811 AB b is a rare exoplanet
HD 143811 AB b scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 1 point would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Long-period world and Directly imaged — 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.