Key parameters at a glance
- A radius of 4.87 Earth radii
- A mass of 21.10 Earth masses
- Surface gravity around 0.89 g
- An orbital period of 5.690 days
- Semi-major axis 0.0599 AU
- Equilibrium temperature 700 K (427 °C)
- Distance from Earth 494.90 light-years
- Earth Similarity Index 0.273
- Travel time at Voyager 1 speed 8,727,607 years
1 sibling around TOI-6109
TOI-6109 b 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-6109 b this | Neptune-like | 4.87 | 21.10 | 5.690 | 700 | 2025 |
| TOI-6109 c | Neptune-like | 4.83 | 20.80 | 8.539 | 786 | 2025 |
TOI-6109 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#402of 574
top 69.9%
This planet
4.87R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-6109 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 4.87 | 11.21 |
| Mass (M⊕) | 1.00 | 21.10 | 317.83 |
| Density (g/cm³) | 5.51 | 1.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.89 | 2.53 |
| Insolation (S⊕) | 1.00 | 39.95 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 384984325
Gaia DR2
Gaia DR2 241035591876195328
Gaia DR3
Gaia DR3 241035596174886016
System
TOI-6109
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.69 Earth days (1.6% of a terrestrial year) at a mean orbital distance of 0.0599 AU.
Transit Fingerprint
Depth
0.147 %
Duration
1.107 h
Impact parameter b
0.945
Rp / R★
0.043800
Transit midpoint (BJD)
2,458,791.0538
Photometric dip
Transit produces a flux drop of 1,470 ppm lasting ≈ 1.11 h.
Extended Orbital Architecture
Planet / star radius ratio
0.043800
Semi-major axis / stellar radius
12.632
Impact parameter (b)
0.945
Transit mid-time (BJD)
2,458,791.0538
Angular separation (arcsec)
0.39500
Eq. Temperature
700K
(427 °C)
Insolation (S⊕)
39.95
Earth = 1.00
Earth Similarity (ESI)
0.273
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.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Dattilo 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-6109
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,660 K — cooler than the Sun (5,778 K)
Estimated Age
0.07 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.021 R☉
Stellar Mass
1.030 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.450 dex
Stellar density
1.193 g/cm³
Systemic radial velocity
2.33 km/s
Rotational v·sin i
18.20 km/s
Rotation period
3.02 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.562 mas
Total Proper Motion
39.475 mas/yr
PM Right Ascension
27.00 mas/yr
PM Declination
-28.80 mas/yr
Galactic Cartesian (pc)
x = 0.472 · y = 0.565 · z = 0.677
Equatorial (J2000)
RA 50.13192° · Dec 42.60696°
Galactic ℓ, b
150.072° · -12.273°
Ecliptic λ, β
59.072° · 23.353°
HTM-20 index
-84450772
Similar Worlds
Kepler-858 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.87 R⊕ · 973.7 ly
CoRoT-22 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.88 R⊕ · 2,045.5 ly
HD 219666 b
Neptune-like · G-type yellow (Sun-like)
Radius 4.90 R⊕ · 307.1 ly
Kepler-27 c
Neptune-like · G-type yellow (Sun-like)
Radius 4.90 R⊕ · 3,406.2 ly
Kepler-82 f
Neptune-like · G-type yellow (Sun-like)
Radius 4.84 R⊕ · 2,949.5 ly
TOI-6109 c
Neptune-like · G-type yellow (Sun-like)
Radius 4.83 R⊕ · 494.9 ly