About HD 152843 c
HD 152843 c is an uncommon exoplanet. It lies about 351.9 light-years from Earth, has an equilibrium temperature near 253 K, spans roughly 5.94 Earth radii and weighs about 9.67 Earth masses.
So low-density it would float on water.
Uncommon exoplanet 31 EP
HD 152843 c
RA 253.7849° · Dec 20.4915° · exoplanet
Score breakdown
· 5 badgesUncommon 33 pts → Rare
- Puffy low-density world +12
- Multi-planet system +6
- Confirmed exoplanet +5
- Neptune-like +4
- Found by TESS +4
Total score 31
2 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
What makes it special
- Cotton-candy planet. So low-density it would float on water.
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 6.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 549.5 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 3519 years in a starship at a tenth of light speed.
- Distance. 352 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1674.
Saying hello
- Say hello. A radio message and its reply would take 704 years round-trip.
Standing on it
- A year here. A full year lasts just 19.5 Earth days.
By the numbers
- Size. About 5.9× the width of Earth.
- Volume. About 210 Earths could fit inside it.
- Mass. About 9.7× the mass of Earth.
- Your weight. You'd weigh about 0.3× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. A surprisingly temperate -20°C average.
How we found it
- Discovery. Found by Transiting Exoplanet Survey Satellite (TESS) using the transit method.
Cosmic context
- Crowded system. One of at least 2 planets orbiting its star.
Properties
- density gcc
- 0.253
- discovery facility
- Transiting Exoplanet Survey Satellite (TESS)
- discovery method
- Transit
- dist ly
- 351.9158
- eccentricity
- 0.074
- eq temp k
- 253.08
- insolation
- 133.1
- mass earth
- 9.67
- name
- HD 152843 c
- orbital period days
- 19.5021
- radius earth
- 5.94
- sys num planets
- 2
How to see it
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 2 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.