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Uncommon exoplanet 31 EP

HD 23472 c

RA 55.4590° · Dec -62.7673° · exoplanet

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Score breakdown

· 4 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Richly packed system +14
  • Super-Earth +8
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Richly packed system · +14
  • Found by TESS · +4

Trivia

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. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • 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.

Could we get there?

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

Properties

density gcc
3.1
diameter km
23854.094
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2019
dist ly
127.3121
eccentricity
0.063
eq temp k
467
host star teff
4684
inclination
89.095
insolation
7.96
mag
9.73
mass earth
3.41
name
HD 23472 c
orbital period days
29.7975
radius earth
1.87
semi major au
0.1646
spect
K4 V
sys num planets
5
sys num stars
1

About HD 23472 c

HD 23472 c is an uncommon 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 467 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

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

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

HD 23472 c scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Super-Earth, 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.