Temperature
3358 K
3329 to 3857.6
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Stellar HostProfile
LTT 3780
Unclassified star • 21.98 pc
Records
8
literature rows
Planets
2
system count
References
8
distinct source labels
TIC: TIC 36724087
Approximate color
from effective temperature
Canonical Summary
Adopted host values from one source row
Values come from the row with the most populated summary measurements. Missing values stay missing. Ranges and counts describe all source rows.
Stellar source: Bonfanti et al. 2024 • System source: TICv8
Mass
0.38 Msun
0.36 to 0.40
Radius
0.38 Rsun
0.37 to 0.38
Age
3.10 Gyr
single adopted value
Luminosity
-1.78 log(Lsun)
-1.81 to -1.78
Distance
21.98 pc
single adopted value
Planets
2
Stable across source rows
Scale Comparison
Radius against the Sun
Current adopted radius: 0.38 R☉ (circles scaled linearly by radius)
Sun
1.0 R☉ baseline
LTT 3780
0.38 R☉
System Layout
Known planets
2 planets linked to this host
LTT 3780 b
Transit
◌
Discovery
2020
Period
0.77 days
Radius
1.32 R⊕
Mass
2.46 M⊕
Eq. Temp
903 K
LTT 3780 c
Transit
◌
Discovery
2020
Period
12.25 days
Radius
2.39 R⊕
Mass
8.04 M⊕
Eq. Temp
359 K
LTT 3780: A Nearby Red Dwarf with Two Transiting Worlds
LTT 3780 is an M3.5 V star, a small, cool red dwarf, located 71.7 light-years away. Its reported mass is 0.381 solar masses, its radius is 0.38 solar radii, and its temperature is 3360 K; each of these measurements is smaller than the Sun's corresponding value. The star is estimated to be 3.1 billion years old. Two planets are known to orbit this host.
The planet LTT 3780 b was discovered by transit in 2020. It is classified as Earth-like, with a radius of 1.33 Earth radii, which is larger than Earth's, and a mass of 2.46 Earth masses, also larger than Earth's. Its mean density is 5.83 g/cm³, 1.06 times Earth's. LTT 3780 b completes an orbit in 0.768 days.
LTT 3780 c was also discovered by transit in 2020. Classified as a Super-Earth, it has a radius of 2.39 Earth radii, larger than Earth's, and a mass of 8.04 Earth masses, likewise larger than Earth's. Its mean density is 3.24 g/cm³, 0.589 times Earth's. LTT 3780 c has an orbital period of 12.3 days.
Among the listed planets, LTT 3780 b has the shortest orbital period, the smallest radius, and the smallest reported mass, while LTT 3780 c has the longest orbital period, the largest radius, and the largest reported mass.
Provenance
Underlying measurements and references
Evidence Summary
Rows
8
Stellar refs
7
System refs
1
Distancestable
Parallaxstable
Temperaturedisputed
Massdisputed
Radiusdisputed
Agestable
Luminositydisputed
Surface Gravitydisputed
Metallicitydisputed
Spectral Typedisputed
| ST TEFF | ST MASS | ST RAD | ST AGE | ST LUM | ST SPECTYPE | SY DIST | Stellar Ref | System Ref |
|---|---|---|---|---|---|---|---|---|
| 3331 | 0.40 | 0.37 | — | — | M4 V | 21.98 | Cloutier et al. 2020 | TICv8 |
| 3331 | 0.36 | 0.37 | — | -1.81 | — | 21.98 | TICv8 | TICv8 |
| 3360 | 0.38 | 0.38 | — | -1.78 | M3.5 V | 21.98 | Nowak et al. 2020 | TICv8 |
| 3857.6 | — | — | — | — | — | 21.98 | Gaia DR2 | TICv8 |
| 3329 | — | 0.37 | — | — | — | 21.98 | ExoFOP | TICv8 |
| 3329 | — | 0.37 | — | — | — | 21.98 | ExoFOP | TICv8 |
| — | 0.36 | 0.38 | — | — | M3.5 V | 21.98 | Weisserman et al. 2026 | TICv8 |
| 3358 | 0.38 | 0.38 | 3.10 | -1.78 | — | 21.98 | Bonfanti et al. 2024 | TICv8 |