← Back to dex
Uncommon exoplanet 28 EP

TIC 18942729 b

RA 119.2151° · Dec 16.6772° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 4 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Ultra-short period +14
  • Confirmed exoplanet +5
  • Sub-Neptune +5
  • Found by TESS +4
Total score 28

6 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Sub-Neptune · +5
  • Ultra-short period · +14
  • Found by TESS · +4

Trivia

Hard to believe

  • A year in a day. Its entire year is over in 24 hours. Birthdays here would come round faster than meals.

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.

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 12.5 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
3.2
diameter km
25515.119
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2026
dist ly
375.6306
host star teff
4360.11
inclination
85.2341
mag
12.545
mass earth
4.66
name
TIC 18942729 b
orbital period days
0.9982
radius earth
2.0002
sys num planets
1
sys num stars
1

About TIC 18942729 b

TIC 18942729 b is an uncommon exoplanet. It lies about 375.6 light-years from Earth, shines at apparent magnitude 12.54, spans roughly 2 Earth radii and weighs about 4.66 Earth masses.

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 12.54, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, TIC 18942729 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 TIC 18942729 b is an uncommon exoplanet

TIC 18942729 b scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Sub-Neptune, Ultra-short period 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.