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Rare exoplanet 49 EP

HD 23472 e

RA 55.4590° · Dec -62.7673° · exoplanet

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Score breakdown

· 5 badges
49 pts · Rare
Rare 50 pts → Epic
  • Earth-sized +16
  • Richly packed system +14
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 49

1 more point to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Earth-sized · +16
  • Tidally locked · +10
  • Richly packed system · +14
  • Found by TESS · +4

Trivia

What makes it special

  • Earth-sized. Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.
  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • Crowded system. One of at least 5 planets orbiting its star.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 9.7 you'll want a small backyard telescope.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around November — that's when to go looking.

Properties

density gcc
7.5
diameter km
10434.5716
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2022
dist ly
127.3121
eccentricity
0.07
eq temp k
723
host star teff
4684
inclination
88.63
insolation
46.7
mag
9.73
mass earth
0.72
name
HD 23472 e
orbital period days
7.9075
radius earth
0.818
semi major au
0.068
spect
K4 V
sys num planets
5
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HD 23472 e

HD 23472 e is a rare exoplanet. It lies about 127.3 light-years from Earth, shines at apparent magnitude 9.73, has spectral type K4 V and has an equilibrium temperature near 723 K.

Genuinely comparable to Earth in size. Worlds in this narrow band are the ones every next-generation telescope is being pointed at.

How to see it

At apparent magnitude 9.73, a small backyard telescope will bring it into view.

Like any astronomical target, HD 23472 e 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 e is a rare exoplanet

HD 23472 e scores 49 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, Earth-sized, Tidally locked, 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.