About TOI-421 c
TOI-421 c is a common exoplanet. It lies about 244 light-years from Earth, has an equilibrium temperature near 635 K, spans roughly 5.09 Earth radii and weighs about 14.1 Earth masses.
One of at least 2 planets orbiting its star.
Common exoplanet 19 EP
TOI-421 c
RA 81.8533° · Dec -14.2767° · exoplanet
Score breakdown
· 4 badgesCommon 24 pts → Uncommon
- Multi-planet system +6
- Confirmed exoplanet +5
- Neptune-like +4
- Found by TESS +4
Total score 19
5 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Neptune-like · +4
- Multi-planet system · +6
- Found by TESS · +4
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 4.3 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 380.9 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 2440 years in a starship at a tenth of light speed.
- Distance. 244 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1782.
Saying hello
- Say hello. A radio message and its reply would take 488 years round-trip.
Standing on it
- A year here. A full year lasts just 16.1 Earth days.
By the numbers
- Size. About 5.1× the width of Earth.
- Volume. About 132 Earths could fit inside it.
- Mass. About 14.1× the mass of Earth.
- Your weight. You'd weigh about 0.5× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. A scorching 362°C on 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
- 0.59
- discovery facility
- Transiting Exoplanet Survey Satellite (TESS)
- discovery method
- Transit
- dist ly
- 243.9546
- eccentricity
- 0.19
- eq temp k
- 635
- insolation
- 34.32
- mass earth
- 14.1
- name
- TOI-421 c
- orbital period days
- 16.0675
- radius earth
- 5.09
- sys num planets
- 2
How to see it
Like any astronomical target, TOI-421 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 TOI-421 c is a common exoplanet
TOI-421 c scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Neptune-like, 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.