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Uncommon exoplanet 33 EP

LHS 1903 b

RA 107.8658° · Dec 48.3279° · exoplanet

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Score breakdown

· 5 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Super-Earth +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Tidally locked · +10
  • Multi-planet system · +6
  • 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. 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 4 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 12.2 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around January — that's when to go looking.

Could we get there?

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

Properties

density gcc
6.82
diameter km
17629.0684
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2026
dist ly
116.4106
eccentricity
0.015
eq temp k
796
host star teff
3664
insolation
66.66
mag
12.23
mass earth
3.28
name
LHS 1903 b
orbital period days
2.1555
radius earth
1.382
semi major au
0.0266
spect
M
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About LHS 1903 b

LHS 1903 b is an uncommon exoplanet. It lies about 116.4 light-years from Earth, shines at apparent magnitude 12.23, has spectral type M and has an equilibrium temperature near 796 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 12.23, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, LHS 1903 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 LHS 1903 b is an uncommon exoplanet

LHS 1903 b scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Super-Earth, Tidally locked, Multi-planet 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.