Key parameters at a glance
- A radius of 5.14 Earth radii
- A mass of 14.95 Earth masses
- Surface gravity around 0.57 g
- An orbital period of 4.675 days
- Semi-major axis 0.0430 AU
- Equilibrium temperature 582 K (309 °C)
- Distance from Earth 260.15 light-years
- Earth Similarity Index 0.295
- Travel time at Voyager 1 speed 4,587,800 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-3785 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#363of 574
top 63.1%
This planet
5.14R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-3785 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.14 | 11.21 |
| Mass (M⊕) | 1.00 | 14.95 | 317.83 |
| Density (g/cm³) | 5.51 | 0.61 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.57 | 2.53 |
| Insolation (S⊕) | 1.00 | 19.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 14.950 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 458419328
Gaia DR2
Gaia DR2 1044013542142711296
Gaia DR3
Gaia DR3 1044013542142711296
System
TOI-3785
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.67 Earth days (1.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0430 AU.
Transit Fingerprint
Depth
0.925 %
Duration
1.700 h
Impact parameter b
0.600
Rp / R★
0.096200
Transit midpoint (BJD)
2,458,861.4955
Photometric dip
Transit produces a flux drop of 9,254 ppm lasting ≈ 1.70 h.
Extended Orbital Architecture
Planet / star radius ratio
0.096200
Semi-major axis / stellar radius
18.890
Impact parameter (b)
0.600
RV semi-amplitude (K)
9.240 m/s
Transit mid-time (BJD)
2,458,861.4955
Long. of periastron (ω)
96.26°
Angular separation (arcsec)
0.53900
Eq. Temperature
582K
(309 °C)
Insolation (S⊕)
19.10
Earth = 1.00
Earth Similarity (ESI)
0.295
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
Powers et al. 2023Instrument
TESS CCD Array
Publication
2023-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-3785
Spectral Class
M-type red dwarf
Effective Temperature
3,576 K — cooler than the Sun (5,778 K)
Estimated Age
8.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.500 R☉
Stellar Mass
0.520 M☉
Metallicity [Fe/H]
0.10
Extended Stellar Properties
Surface gravity (log g)
4.747 dex
Stellar density
5.662 g/cm³
Systemic radial velocity
4.66 km/s
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
12.508 mas
Total Proper Motion
46.160 mas/yr
PM Right Ascension
-42.90 mas/yr
PM Declination
-17.03 mas/yr
Galactic Cartesian (pc)
x = -0.296 · y = 0.342 · z = 0.892
Equatorial (J2000)
RA 130.90023° · Dec 63.07808°
Galactic ℓ, b
152.778° · 36.584°
Ecliptic λ, β
113.906° · 42.994°
HTM-20 index
-1102809516
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