← Back to dex
Epic exoplanet 75 EP

TOI-561 b

RA 148.1852° · Dec 6.2161° · exoplanet

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

Computing the sky for your location…

Score breakdown

· 8 badges
75 pts · Epic
Epic 78 pts → Anomaly
  • Ultra-hot Jupiter +26
  • Ultra-short period +14
  • Super-Earth +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Blasted by starlight +4
  • Found by TESS +4
Total score 75

3 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Ultra-hot Jupiter · +26
  • Ultra-short period · +14
  • Multi-planet system · +6
  • Blasted by starlight · +4
  • Found by TESS · +4
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Ultra-hot Jupiter. So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

Hard to believe

  • A year in a day. Its entire year is over in 10.7 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.
  • 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 10.3 you'll want a small backyard telescope.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.

Properties

density gcc
4.1
diameter km
17820.4114
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
279.8386
eccentricity
0
eq temp k
2319
host star teff
5342
inclination
87
insolation
4709
mag
10.252
mass earth
2.02
name
TOI-561 b
orbital period days
0.4466
radius earth
1.397
semi major au
0.0106
spect
G9 V
sys num planets
4
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About TOI-561 b

TOI-561 b is an epic exoplanet. It lies about 279.8 light-years from Earth, shines at apparent magnitude 10.25, has spectral type G9 V and has an equilibrium temperature near 2,319 K.

So hot that iron vaporises on the dayside, blows around to the night side and rains back down as molten metal.

How to see it

At apparent magnitude 10.25, a small backyard telescope will bring it into view.

Like any astronomical target, TOI-561 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 TOI-561 b is an epic exoplanet

TOI-561 b scores 75 points on Spacedle's rarity scale, which places it in the epic tier. Another 3 points would lift it into a rarer tier.

That score comes from 8 science badges — Confirmed exoplanet, Super-Earth, Ultra-hot Jupiter, Ultra-short period, Multi-planet system, Blasted by starlight, Found by TESS 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.