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Epic exoplanet 55 EP

Qatar-10 b

RA 284.4439° · Dec 69.5708° · exoplanet

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Score breakdown

· 7 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Puffy low-density world +12
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 55

23 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Blasted by starlight · +4

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 12.9 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Properties

density gcc
0.248
diameter km
220624.6913
discovery facility
Qatar
discovery method
Transit
discovery year
2019
dist ly
1823.4338
eccentricity
0
eq temp k
1955
host star teff
6124
inclination
85.87
insolation
1816.48
mag
12.868
mass earth
233.9229
name
Qatar-10 b
orbital period days
1.6453
radius earth
17.2955
semi major au
0.0286
spect
F7 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About Qatar-10 b

Qatar-10 b is an epic exoplanet. It lies about 1,823.4 light-years from Earth, shines at apparent magnitude 12.87, has spectral type F7 V and has an equilibrium temperature near 1,955 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 12.87, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, Qatar-10 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 Qatar-10 b is an epic exoplanet

Qatar-10 b scores 55 points on Spacedle's rarity scale, which places it in the epic tier. Another 23 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Lava world, Tidally locked, Puffy low-density world and Blasted by starlight — 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.