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Epic exoplanet 55 EP

HATS-18 b

RA 173.9574° · Dec -29.1561° · exoplanet

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Score breakdown

· 7 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Ultra-short period +14
  • Orbits a Sun-like star +8
  • 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
  • Ultra-short period · +14
  • Blasted by starlight · +4
  • 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

  • A year in a day. Its entire year is over in 20.1 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. 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 14.2 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 March — that's when to go looking.

Properties

density gcc
1.1169
diameter km
190026.0627
discovery facility
Multiple Observatories
discovery method
Transit
discovery year
2016
dist ly
2036.4137
eccentricity
0.166
eq temp k
2069.48
host star teff
5600
inclination
85.29
insolation
2990
mag
14.188
mass earth
629.1445
name
HATS-18 b
orbital period days
0.8378
radius earth
14.8968
semi major au
0.0174
spect
G V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HATS-18 b

HATS-18 b is an epic exoplanet. It lies about 2,036.4 light-years from Earth, shines at apparent magnitude 14.19, has spectral type G V and has an equilibrium temperature near 2,069 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 14.19, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, HATS-18 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-18 b is an epic exoplanet

HATS-18 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, Ultra-short period, Blasted by starlight 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.