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Rare exoplanet 47 EP

HATS-43 b

RA 80.5382° · Dec -30.9708° · exoplanet

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Score breakdown

· 6 badges
47 pts · Rare
Rare 50 pts → Epic
  • Puffy low-density world +12
  • Hot Jupiter +10
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 47

3 more points to reach Epic.

Badges

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

Trivia

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 13.6 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 December — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Properties

density gcc
0.191
diameter km
168721.41
discovery facility
HATSouth
discovery method
Transit
discovery year
2018
dist ly
1181.5751
eccentricity
0.173
eq temp k
1003
host star teff
5099
inclination
89.24
insolation
192.2328
mag
13.562
mass earth
82.9536
name
HATS-43 b
orbital period days
4.3888
radius earth
13.2266
semi major au
0.0494
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HATS-43 b

HATS-43 b is a rare exoplanet. It lies about 1,181.6 light-years from Earth, shines at apparent magnitude 13.56, has an equilibrium temperature near 1,003 K and spans roughly 13.23 Earth radii.

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

Like any astronomical target, HATS-43 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-43 b is a rare exoplanet

HATS-43 b scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Hot Jupiter, Tidally locked and Puffy low-density world — 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.