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Epic exoplanet 77 EP

TOI-1338 b

RA 92.1331° · Dec -59.5410° · exoplanet

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Score breakdown

· 8 badges
77 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Circumbinary (orbits both stars) +14
  • Orbits a Sun-like star +8
  • Distant (over 1,000 light-years) +6
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
  • Found by TESS +4
Total score 77

1 more point to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • In the habitable zone · +30
  • Gas giant · +4
  • Multi-planet system · +6
  • Circumbinary (orbits both stars) · +14
  • Found by TESS · +4
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

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

  • 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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.
  • 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 11.7 you'll want a small backyard telescope.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.

Properties

circumbinary
yes
density gcc
0.56
diameter km
97725.2482
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
1301.4179
eccentricity
0.0331
eq temp k
254.65
habitable zone
yes
host star teff
5723.2
inclination
90.494
insolation
0.9938
mag
11.722
mass earth
11.3
name
TOI-1338 b
orbital period days
95.4001
radius earth
7.661
semi major au
0.4607
spect
F8
sys num planets
2
sys num stars
2

About TOI-1338 b

TOI-1338 b is an epic exoplanet. It lies about 1,301.4 light-years from Earth, shines at apparent magnitude 11.72, has spectral type F8 and has an equilibrium temperature near 255 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 11.72, a small backyard telescope will bring it into view.

Like any astronomical target, TOI-1338 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-1338 b is an epic exoplanet

TOI-1338 b scores 77 points on Spacedle's rarity scale, which places it in the epic tier. Another 1 point would lift it into a rarer tier.

That score comes from 8 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), In the habitable zone, Gas giant, Multi-planet system, Circumbinary (orbits both stars), Found by TESS and Orbits a Sun-like star — 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.