Uncommon exoplanet 29 EP

HD 23472 d

RA 55.4590° · Dec -62.7673° · exoplanet

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Score breakdown

· 4 badges

29 pts · Uncommon

Uncommon 33 pts → Rare

Richly packed system +14
Multi-planet system +6
Confirmed exoplanet +5
Found by TESS +4

Total score 29

4 more points to reach Rare.

Badges

Confirmed exoplanet · +5
Multi-planet system · +6
Richly packed system · +14
Found by TESS · +4

Trivia

What makes it special

Packed system. Crammed into a system of five or more planets.

Could we get there?

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

Getting there

Aboard Voyager 1. ≈ 2.2 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 198.8 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 1273 years in a starship at a tenth of light speed.
Distance. 127 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1899.

Saying hello

Say hello. A radio message and its reply would take 255 years round-trip.

Standing on it

A year here. A full year lasts just 4 Earth days.

By the numbers

Size. Around 75% of Earth's width.
Mass. About 0.6× the mass of Earth.
Your weight. You'd weigh about 1.0× your Earth weight standing here.
Temperature. Around 636°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 5 planets orbiting its star.

Properties

density gcc: 7.5
discovery facility: Transiting Exoplanet Survey Satellite (TESS)
discovery method: Transit
dist ly: 127.3121
eccentricity: 0.07
eq temp k: 909
insolation: 117
mass earth: 0.55
name: HD 23472 d
orbital period days: 3.9766
radius earth: 0.75
sys num planets: 5

About HD 23472 d

HD 23472 d is an uncommon exoplanet. It lies about 127.3 light-years from Earth, has an equilibrium temperature near 909 K, spans roughly 0.75 Earth radii and weighs about 0.55 Earth masses.

Crammed into a system of five or more planets.

How to see it

Like any astronomical target, HD 23472 d 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 23472 d is an uncommon exoplanet

HD 23472 d scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Multi-planet system, Richly packed 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.