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Rare exoplanet 41 EP

HATS-57 b

RA 60.9483° · Dec -19.0568° · exoplanet

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Score breakdown

· 5 badges
41 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Tidally locked +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 41

9 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • 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.

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. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

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 12.3 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.

Could we get there?

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

Properties

density gcc
2.65
diameter km
162859.056
discovery facility
HATSouth
discovery method
Transit
discovery year
2019
dist ly
911.5571
eccentricity
0.028
eq temp k
1413.4
host star teff
5587
inclination
87.88
insolation
570.233
mag
12.333
mass earth
1000.211
name
HATS-57 b
orbital period days
2.3506
radius earth
12.7671
semi major au
0.0349
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HATS-57 b

HATS-57 b is a rare exoplanet. It lies about 911.6 light-years from Earth, shines at apparent magnitude 12.33, has an equilibrium temperature near 1,413 K and spans roughly 12.77 Earth radii.

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

How to see it

At apparent magnitude 12.33, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, HATS-57 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 HATS-57 b is a rare exoplanet

HATS-57 b scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, 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.