Key parameters at a glance
- A radius of 9.64 Earth radii
- A mass of 54.03 Earth masses
- Surface gravity around 0.58 g
- An orbital period of 6.300 days
- Semi-major axis 0.0654 AU
- Equilibrium temperature 929 K (656 °C)
- Distance from Earth 736.28 light-years
- Earth Similarity Index 0.141
- Travel time at Voyager 1 speed 12,984,255 years
TOI-2876 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#30of 574
top 5.1%
This planet
9.64R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-2876 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.64 | 11.21 |
| Mass (M⊕) | 1.00 | 54.03 | 317.83 |
| Density (g/cm³) | 5.51 | 0.33 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.58 | 2.53 |
| Insolation (S⊕) | 1.00 | 124.20 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 54.031 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 10827386
Gaia DR2
Gaia DR2 2929750922377138816
Gaia DR3
Gaia DR3 2929750922377138816
System
TOI-2876
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.30 Earth days (1.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0654 AU.
Transit Fingerprint
Depth
1.025 %
Duration
2.249 h
Impact parameter b
0.806
Transit midpoint (BJD)
2,459,109.7722
Photometric dip
Transit produces a flux drop of 10,250 ppm lasting ≈ 2.25 h.
Extended Orbital Architecture
Semi-major axis / stellar radius
16.100
Impact parameter (b)
0.806
RV semi-amplitude (K)
19.500 m/s
Transit mid-time (BJD)
2,459,109.7722
Angular separation (arcsec)
0.29000
Eq. Temperature
929K
(656 °C)
Insolation (S⊕)
124.20
Earth = 1.00
Earth Similarity (ESI)
0.141
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Yee et al. 2025Instrument
TESS CCD Array
Publication
2025-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2876
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,271 K — cooler than the Sun (5,778 K)
Estimated Age
3.80 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.873 R☉
Stellar Mass
0.939 M☉
Metallicity [Fe/H]
0.35
Extended Stellar Properties
Surface gravity (log g)
4.529 dex
Stellar density
1.990 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.401 mas
Total Proper Motion
15.743 mas/yr
PM Right Ascension
15.53 mas/yr
PM Declination
2.55 mas/yr
Galactic Cartesian (pc)
x = -0.323 · y = 0.875 · z = -0.360
Equatorial (J2000)
RA 110.24735° · Dec -21.11464°
Galactic ℓ, b
235.013° · -3.297°
Ecliptic λ, β
116.072° · -42.738°
HTM-20 index
1828774189
Similar Worlds
TOI-1298 b
Neptune-like · G-type yellow (Sun-like)
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HD 76700 b
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