Key parameters at a glance
- A radius of 8.70 Earth radii
- A mass of 86.70 Earth masses
- Surface gravity around 1.15 g
- An orbital period of 1.523 days
- Semi-major axis 0.0181 AU
- Equilibrium temperature 694 K (421 °C)
- Distance from Earth 261.39 light-years
- Earth Similarity Index 0.228
- Travel time at Voyager 1 speed 4,609,593 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-4860 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#105of 574
top 18.1%
This planet
8.70R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-4860 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 8.70 | 11.21 |
| Mass (M⊕) | 1.00 | 86.70 | 317.83 |
| Density (g/cm³) | 5.51 | 0.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.15 | 2.53 |
| Insolation (S⊕) | 1.00 | 42.50 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 86.700 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 335590096
Gaia DR2
Gaia DR2 3571038605366263424
Gaia DR3
Gaia DR3 3571038605366263424
System
TOI-4860
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.52 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0181 AU.
Transit Fingerprint
Depth
5.806 %
Duration
1.231 h
Impact parameter b
0.290
Rp / R★
0.222800
Transit midpoint (BJD)
2,460,036.6912
Photometric dip
Transit produces a flux drop of 58,060 ppm lasting ≈ 1.23 h.
Extended Orbital Architecture
Planet / star radius ratio
0.222800
Semi-major axis / stellar radius
11.000
Impact parameter (b)
0.290
RV semi-amplitude (K)
98.900 m/s
Transit mid-time (BJD)
2,460,036.6912
Long. of periastron (ω)
240.00°
Angular separation (arcsec)
0.22600
Eq. Temperature
694K
(421 °C)
Insolation (S⊕)
42.50
Earth = 1.00
Earth Similarity (ESI)
0.228
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.
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
Triaud et al. 2023Instrument
TESS CCD Array
Publication
2023-10
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-4860
Spectral Class
M-type red dwarf
Effective Temperature
3,260 K — cooler than the Sun (5,778 K)
Estimated Age
4.50 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.358 R☉
Stellar Mass
0.340 M☉
Metallicity [Fe/H]
0.27
Extended Stellar Properties
Surface gravity (log g)
4.860 dex
Stellar density
11.700 g/cm³
Activity index (log R'HK)
-5.650
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 10 bands
Astrometric Data
Parallax
12.450 mas
Total Proper Motion
177.330 mas/yr
PM Right Ascension
-177.24 mas/yr
PM Declination
-5.52 mas/yr
Galactic Cartesian (pc)
x = -0.972 · y = -0.061 · z = -0.228
Equatorial (J2000)
RA 183.56396° · Dec -13.17484°
Galactic ℓ, b
289.146° · 48.699°
Ecliptic λ, β
188.551° · -10.663°
HTM-20 index
-1350582321
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Neptune-like · M-type red dwarf
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TOI-3629 b
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