About TOI-1273 b
TOI-1273 b is a rare exoplanet. It lies about 577.7 light-years from Earth, has an equilibrium temperature near 1,211 K, spans roughly 11.1 Earth radii and weighs about 70.56 Earth masses.
So low-density it would float on water.
Rare exoplanet 35 EP
TOI-1273 b
RA 214.1209° · Dec 58.3903° · exoplanet
Score breakdown
· 5 badgesRare 46 pts → Epic
- Puffy low-density world +12
- Hot Jupiter +10
- Confirmed exoplanet +5
- Gas giant +4
- Found by TESS +4
Total score 35
11 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Hot Jupiter · +10
- Puffy low-density world · +12
- 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. ≈ 10.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 902 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 5777 years in a starship at a tenth of light speed.
- Distance. 578 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1448.
Saying hello
- Say hello. A radio message and its reply would take 1155 years round-trip.
Standing on it
- A year here. A full year lasts just 4.6 Earth days.
By the numbers
- Size. About 11.1× the width of Earth.
- Volume. About 1366 Earths could fit inside it.
- Mass. Roughly 70.6× Earth's mass — about 0.2 Jupiters.
- Your weight. You'd weigh about 0.6× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. Around 938°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Transiting Exoplanet Survey Satellite (TESS) using the transit method.
Properties
- density gcc
- 0.28
- discovery facility
- Transiting Exoplanet Survey Satellite (TESS)
- discovery method
- Transit
- dist ly
- 577.681
- eccentricity
- 0.055
- eq temp k
- 1211
- insolation
- 225.013
- mass earth
- 70.5579
- name
- TOI-1273 b
- orbital period days
- 4.6313
- radius earth
- 11.0969
- sys num planets
- 1
How to see it
Like any astronomical target, TOI-1273 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 TOI-1273 b is a rare exoplanet
TOI-1273 b scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Puffy low-density world 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.