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Rare exoplanet 47 EP

NGTS-23 b

RA 70.4323° · Dec -40.0445° · exoplanet

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Score breakdown

· 6 badges
47 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 47

3 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

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 14.1 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around November — that's when to go looking.

Properties

density gcc
0.374
diameter km
181160.7275
discovery facility
Next-Generation Transit Survey (NGTS)
discovery method
Transit
discovery year
2022
dist ly
3506.0139
eccentricity
0
eq temp k
1327
host star teff
6057
inclination
89.12
insolation
815.7013
mag
14.126
mass earth
194.8288
name
NGTS-23 b
orbital period days
4.0764
radius earth
14.2018
semi major au
0.0504
spect
F9 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About NGTS-23 b

NGTS-23 b is a rare exoplanet. It lies about 3,506 light-years from Earth, shines at apparent magnitude 14.13, has spectral type F9 V and has an equilibrium temperature near 1,327 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 14.13, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, NGTS-23 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 NGTS-23 b is a rare exoplanet

NGTS-23 b scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Lava world, Tidally locked and Orbits a Sun-like star — 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.