About LTT 3780 b
LTT 3780 b is a rare exoplanet. It lies about 71.7 light-years from Earth, has an equilibrium temperature near 903 K, spans roughly 1.32 Earth radii and weighs about 2.46 Earth masses.
One of at least 2 planets orbiting its star.
Rare exoplanet 37 EP
LTT 3780 b
RA 154.6449° · Dec -11.7178° · exoplanet
Score breakdown
· 5 badgesRare 46 pts → Epic
- Ultra-short period +14
- Super-Earth +8
- Multi-planet system +6
- Confirmed exoplanet +5
- Found by TESS +4
Total score 37
9 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Super-Earth · +8
- Ultra-short period · +14
- 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. ≈ 1.3 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 111.9 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 717 years in a starship at a tenth of light speed.
- Distance. 71.7 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1954.
Saying hello
- Say hello. A radio message and its reply would take 143 years round-trip.
Standing on it
- A year here. A full year lasts just 0.8 Earth days.
By the numbers
- Size. About 1.3× the width of Earth.
- Mass. About 2.5× the mass of Earth.
- Your weight. You'd weigh about 1.4× your Earth weight standing here.
- Temperature. Around 630°C — hotter than a self-cleaning oven.
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
- 5.8
- discovery facility
- Transiting Exoplanet Survey Satellite (TESS)
- discovery method
- Transit
- dist ly
- 71.6937
- eccentricity
- 0
- eq temp k
- 903
- insolation
- 111
- mass earth
- 2.46
- name
- LTT 3780 b
- orbital period days
- 0.7684
- radius earth
- 1.325
- sys num planets
- 2
How to see it
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 a rare exoplanet
LTT 3780 b scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Super-Earth, Ultra-short period, 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.