Key parameters at a glance
- A radius of 5.53 Earth radii
- A mass of 53.70 Earth masses
- Surface gravity around 1.76 g
- An orbital period of 1.557 days
- Semi-major axis 0.0254 AU
- Equilibrium temperature 1,539 K (1266 °C)
- Distance from Earth 812.19 light-years
- Earth Similarity Index 0.122
- Travel time at Voyager 1 speed 14,323,035 years
TOI-3862 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#315of 574
top 54.7%
This planet
5.53R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-3862 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.53 | 11.21 |
| Mass (M⊕) | 1.00 | 53.70 | 317.83 |
| Density (g/cm³) | 5.51 | 1.75 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.76 | 2.53 |
| Insolation (S⊕) | 1.00 | 358.84 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 53.700 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 141205978
Gaia DR2
Gaia DR2 1547655215589870336
Gaia DR3
Gaia DR3 1547655215589870336
System
TOI-3862
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 1.56 Earth days (0.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0254 AU.
Transit Fingerprint
Depth
0.390 %
Duration
1.409 h
Impact parameter b
0.135
Rp / R★
0.055080
Transit midpoint (BJD)
2,459,662.7387
Photometric dip
Transit produces a flux drop of 3,900 ppm lasting ≈ 1.41 h.
Extended Orbital Architecture
Planet / star radius ratio
0.055080
Semi-major axis / stellar radius
8.848
Impact parameter (b)
0.135
RV semi-amplitude (K)
31.770 m/s
Transit mid-time (BJD)
2,459,662.7387
Long. of periastron (ω)
278.72°
Angular separation (arcsec)
0.10200
Eq. Temperature
1,539K
(1266 °C)
Insolation (S⊕)
358.84
Earth = 1.00
Earth Similarity (ESI)
0.122
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Carleo et al. 2026Instrument
TESS CCD Array
Publication
2026-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2026 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3862
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,300 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.920 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
0.11
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
1.597 g/cm³
Systemic radial velocity
-27.84 km/s
Rotational v·sin i
3.50 km/s
Rotation period
13.00 days
Activity index (log R'HK)
-5.050
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.987 mas
Total Proper Motion
42.837 mas/yr
PM Right Ascension
41.31 mas/yr
PM Declination
-11.35 mas/yr
Galactic Cartesian (pc)
x = -0.632 · y = -0.065 · z = 0.772
Equatorial (J2000)
RA 185.90056° · Dec 50.54462°
Galactic ℓ, b
133.839° · 65.990°
Ecliptic λ, β
158.638° · 47.256°
HTM-20 index
-823331349
Similar Worlds
K2-353 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.55 R⊕ · 875.8 ly
Kepler-18 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.49 R⊕ · 1,412.4 ly
Kepler-238 e
Neptune-like · G-type yellow (Sun-like)
Radius 5.60 R⊕ · 5,866.7 ly
Kepler-103 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.45 R⊕ · 1,613.9 ly
KOI-1783.02
Neptune-like · G-type yellow (Sun-like)
Radius 5.44 R⊕ · 2,823.6 ly
HD 105618 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.44 R⊕ · 228.6 ly