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Epic exoplanet 53 EP

LTT 9779 b

RA 358.6689° · Dec -37.6282° · exoplanet

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Score breakdown

· 7 badges
53 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Ultra-short period +14
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Neptune-like +4
  • Blasted by starlight +4
  • Found by TESS +4
Total score 53

25 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Lava world · +14
  • Ultra-short period · +14
  • Blasted by starlight · +4
  • Found by TESS · +4
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

Hard to believe

  • A year in a day. Its entire year is over in 19 hours. Birthdays here would come round faster than meals.

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.

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 9.8 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.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Properties

density gcc
1.536
diameter km
60209.264
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
262.3511
eccentricity
0
eq temp k
1978
host star teff
5443
inclination
76.39
insolation
1781.1556
mag
9.79
mass earth
29.32
name
LTT 9779 b
orbital period days
0.7921
radius earth
4.72
semi major au
0.0168
spect
G7 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About LTT 9779 b

LTT 9779 b is an epic exoplanet. It lies about 262.4 light-years from Earth, shines at apparent magnitude 9.79, has spectral type G7 V and has an equilibrium temperature near 1,978 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 9.79, a small backyard telescope will bring it into view.

Like any astronomical target, LTT 9779 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 LTT 9779 b is an epic exoplanet

LTT 9779 b scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Neptune-like, Lava world, Ultra-short period, Blasted by starlight, 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.