Key parameters at a glance
- A radius of 1.50 Earth radii
- A mass of 2.87 Earth masses
- Surface gravity around 1.28 g
- An orbital period of 7.610 days
- Semi-major axis 0.0460 AU
- Equilibrium temperature 365 K (92 °C)
- Distance from Earth 82.45 light-years
- Earth Similarity Index 0.771
- Travel time at Voyager 1 speed 1,453,976 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-771
TOI-771 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-771 b | Super-Earth | 1.36 | 2.47 | 2.326 | 543 | 2024 |
| TOI-771 c this | Super-Earth | 1.50 | 2.87 | 7.610 | 365 | 2025 |
TOI-771 c Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#748of 1176
top 63.5%
This planet
1.50R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-771 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.50 | 11.21 |
| Mass (M⊕) | 1.00 | 2.87 | 317.83 |
| Density (g/cm³) | 5.51 | 4.67 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.28 | 2.53 |
| Insolation (S⊕) | 1.00 | 3.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 2.870 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
TIC
TIC 277634430
Gaia DR2
Gaia DR2 5229384714547758720
Gaia DR3
Gaia DR3 5229384714547758720
System
TOI-771
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.61 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0460 AU.
Extended Orbital Architecture
Semi-major axis / stellar radius
42.000
RV semi-amplitude (K)
2.580 m/s
Long. of periastron (ω)
-82.00°
Angular separation (arcsec)
1.82000
Eq. Temperature
365K
(92 °C)
Insolation (S⊕)
3.00
Earth = 1.00
Earth Similarity (ESI)
0.771
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Lacedelli et al. 2025Instrument
ESPRESSO
Publication
2025-04
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at Paranal Observatory (8 shown).
Host System: TOI-771
Spectral Class
M-type red dwarf
Effective Temperature
3,370 K — cooler than the Sun (5,778 K)
Estimated Age
6.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.232 R☉
Stellar Mass
0.220 M☉
Metallicity [Fe/H]
-0.13
Extended Stellar Properties
Surface gravity (log g)
4.800 dex
Stellar density
23.685 g/cm³
Systemic radial velocity
-5.90 km/s
Rotation period
98.00 days
Activity index (log R'HK)
-6.360
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
39.530 mas
Total Proper Motion
86.005 mas/yr
PM Right Ascension
39.48 mas/yr
PM Declination
-76.41 mas/yr
Galactic Cartesian (pc)
x = -0.281 · y = 0.080 · z = -0.956
Equatorial (J2000)
RA 164.11389° · Dec -72.98517°
Galactic ℓ, b
294.660° · -11.987°
Ecliptic λ, β
227.472° · -65.393°
HTM-20 index
-1232841563
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