Key parameters at a glance
- A radius of 4.95 Earth radii
- A mass of 21.70 Earth masses
- Surface gravity around 0.89 g
- An orbital period of 6.387 days
- Semi-major axis 0.0635 AU
- Equilibrium temperature 805 K (532 °C)
- Distance from Earth 197.87 light-years
- Earth Similarity Index 0.236
- Travel time at Voyager 1 speed 3,489,472 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-880
TOI-880 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-880.02 | Sub-Neptune | 2.19 | 5.43 | 2.576 | 1,085 | 2024 |
| TOI-880 c this | Neptune-like | 4.95 | 21.70 | 6.387 | 805 | 2025 |
TOI-880 c Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#386of 574
top 67.1%
This planet
4.95R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-880 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.95 | 11.21 |
| Mass (M⊕) | 1.00 | 21.70 | 317.83 |
| Density (g/cm³) | 5.51 | 0.98 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.89 | 2.53 |
| Insolation (S⊕) | 1.00 | 74.00 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 34077285
Gaia DR2
Gaia DR2 2993658970584498048
Gaia DR3
Gaia DR3 2993658970584498048
System
TOI-880
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.39 Earth days (1.7% of a terrestrial year) at a mean orbital distance of 0.0635 AU.
Transit Fingerprint
Depth
0.351 %
Duration
2.343 h
Impact parameter b
0.517
Rp / R★
0.054670
Transit midpoint (BJD)
2,459,403.6751
Photometric dip
Transit produces a flux drop of 3,510 ppm lasting ≈ 2.34 h.
Extended Orbital Architecture
Planet / star radius ratio
0.054670
Semi-major axis / stellar radius
16.480
Impact parameter (b)
0.517
Transit mid-time (BJD)
2,459,403.6751
Sky-projected obliquity (λ)
-7.40°
Angular separation (arcsec)
1.05000
Eq. Temperature
805K
(532 °C)
Insolation (S⊕)
74.00
Earth = 1.00
Earth Similarity (ESI)
0.236
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
Zhang et al. 2025Instrument
TESS CCD Array
Publication
2025-09
Observation locale
Space
Discovery cohort
Planets confirmed in 2025 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-880
Spectral Class
K-type orange
Effective Temperature
5,050 K — cooler than the Sun (5,778 K)
Estimated Age
5.20 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.830 R☉
Stellar Mass
0.870 M☉
Metallicity [Fe/H]
0.23
Extended Stellar Properties
Surface gravity (log g)
4.530 dex
Stellar density
2.975 g/cm³
Rotational v·sin i
1.57 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
16.454 mas
Total Proper Motion
23.257 mas/yr
PM Right Ascension
0.96 mas/yr
PM Declination
23.24 mas/yr
Galactic Cartesian (pc)
x = -0.070 · y = 0.968 · z = -0.242
Equatorial (J2000)
RA 94.16447° · Dec -13.98734°
Galactic ℓ, b
221.717° · -13.932°
Ecliptic λ, β
95.082° · -37.353°
HTM-20 index
402002310
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