← Back to dex
Uncommon exoplanet 31 EP

HD 152843 c

RA 253.7849° · Dec 20.4915° · exoplanet

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

Computing the sky for your location…

Score breakdown

· 5 badges
31 pts · Uncommon
Uncommon 34 pts → Rare
  • Puffy low-density world +12
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Found by TESS +4
Total score 31

3 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Puffy low-density world · +12
  • Multi-planet system · +6
  • Found by TESS · +4

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.
  • Crowded system. One of at least 2 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 8.9 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around June — that's when to go looking.

Properties

density gcc
0.253
diameter km
75771.828
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2021
dist ly
351.9158
eccentricity
0.074
eq temp k
253.08
host star teff
6310
inclination
89.21
insolation
133.1
mag
8.855
mass earth
9.67
name
HD 152843 c
orbital period days
19.5021
radius earth
5.94
semi major au
0.1482
spect
G0
sys num planets
2
sys num stars
1

About HD 152843 c

HD 152843 c is an uncommon exoplanet. It lies about 351.9 light-years from Earth, shines at apparent magnitude 8.86, has spectral type G0 and has an equilibrium temperature near 253 K.

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 8.86, it is an easy target for binoculars.

Like any astronomical target, HD 152843 c 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 HD 152843 c is an uncommon exoplanet

HD 152843 c scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Neptune-like, Puffy low-density world, Multi-planet system and Found by TESS — 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.