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Epic exoplanet 57 EP

LTT 3780 b

RA 154.6449° · Dec -11.7178° · exoplanet

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Score breakdown

· 7 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • Ultra-short period +14
  • Two suns in its sky +12
  • Super-Earth +8
  • Orbits a red dwarf +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 57

21 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Super-Earth · +8
  • Ultra-short period · +14
  • Multi-planet system · +6
  • Found by TESS · +4
  • Orbits a red dwarf · +8
  • Two suns in its sky · +12

Trivia

Hard to believe

  • A year in a day. Its entire year is over in 18.4 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. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • Crowded system. One of at least 2 planets orbiting its star.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 13.1 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • 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 February — that's when to go looking.

Properties

density gcc
5.8
diameter km
16901.965
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
71.6937
eccentricity
0
eq temp k
903
host star teff
3358
inclination
86.1
insolation
111
mag
13.14
mass earth
2.46
multi star system
yes
name
LTT 3780 b
orbital period days
0.7684
radius earth
1.325
semi major au
0.012
spect
M3.5 V
sys num planets
2
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About LTT 3780 b

LTT 3780 b is an epic exoplanet. It lies about 71.7 light-years from Earth, shines at apparent magnitude 13.14, has spectral type M3.5 V and has an equilibrium temperature near 903 K.

It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

How to see it

At apparent magnitude 13.14, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, LTT 3780 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 3780 b is an epic exoplanet

LTT 3780 b scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Super-Earth, Ultra-short period, Multi-planet system, Found by TESS, Orbits a red dwarf and Two suns in its sky — 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.