Key parameters at a glance
- A radius of 1.66 Earth radii
- A mass of 3.41 Earth masses
- Surface gravity around 1.23 g
- An orbital period of 14.363 days
- Semi-major axis 0.1054 AU
- Equilibrium temperature 621 K (348 °C)
- Distance from Earth 221.94 light-years
- Earth Similarity Index 0.470
- Travel time at Voyager 1 speed 3,913,918 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-871 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#465of 1176
top 39.5%
This planet
1.66R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-871 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.66 | 11.21 |
| Mass (M⊕) | 1.00 | 3.41 | 317.83 |
| Density (g/cm³) | 5.51 | 4.07 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.23 | 2.53 |
| Insolation (S⊕) | 1.00 | 24.78 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 219344917
Gaia DR2
Gaia DR2 4783664690873269888
Gaia DR3
Gaia DR3 4783664690873269888
System
TOI-871
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.36 Earth days (3.9% of a terrestrial year) at a mean orbital distance of 0.1054 AU.
Transit Fingerprint
Depth
0.045 %
Duration
4.032 h
Impact parameter b
0.300
Rp / R★
0.021000
Transit midpoint (BJD)
2,458,417.0523
Photometric dip
Transit produces a flux drop of 450 ppm lasting ≈ 4.03 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021000
Semi-major axis / stellar radius
26.300
Impact parameter (b)
0.300
Transit mid-time (BJD)
2,458,417.0523
Angular separation (arcsec)
1.55000
Eq. Temperature
621K
(348 °C)
Insolation (S⊕)
24.78
Earth = 1.00
Earth Similarity (ESI)
0.470
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Mistry et al. 2023Instrument
TESS CCD Array
Publication
2023-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-871
Spectral Class
K-type orange
Effective Temperature
4,929 K — cooler than the Sun (5,778 K)
Estimated Age
5.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.719 R☉
Stellar Mass
0.758 M☉
Metallicity [Fe/H]
-0.07
Extended Stellar Properties
Surface gravity (log g)
4.604 dex
Stellar density
2.870 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
14.667 mas
Total Proper Motion
145.292 mas/yr
PM Right Ascension
-79.36 mas/yr
PM Declination
-121.71 mas/yr
Galactic Cartesian (pc)
x = 0.167 · y = 0.612 · z = -0.773
Equatorial (J2000)
RA 74.73763° · Dec -50.62742°
Galactic ℓ, b
257.529° · -38.214°
Ecliptic λ, β
56.673° · -72.304°
HTM-20 index
324522591
Similar Worlds
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Super-Earth · K-type orange
Radius 1.66 R⊕ · —
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