Key parameters at a glance
- A radius of 11.35 Earth radii
- A mass of 226.61 Earth masses
- Surface gravity around 1.76 g
- An orbital period of 2.367 days
- Semi-major axis 0.0262 AU
- Equilibrium temperature 683 K (410 °C)
- Distance from Earth 651.41 light-years
- Earth Similarity Index 0.220
- Travel time at Voyager 1 speed 11,487,647 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-5916 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1610of 1771
top 90.9%
This planet
11.35R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-5916 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.35 | 11.21 |
| Mass (M⊕) | 1.00 | 226.61 | 317.83 |
| Density (g/cm³) | 5.51 | 0.86 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.76 | 2.53 |
| Insolation (S⊕) | 1.00 | 51.70 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 226.612 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 305506996
Gaia DR2
Gaia DR2 1741429438313012608
Gaia DR3
Gaia DR3 1741429438313012608
System
TOI-5916
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.37 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0262 AU.
Transit Fingerprint
Depth
4.870 %
Duration
42.580 h
Impact parameter b
0.158
Rp / R★
0.216900
Transit midpoint (BJD)
2,460,255.6055
Photometric dip
Transit produces a flux drop of 48,700 ppm lasting ≈ 42.58 h.
Extended Orbital Architecture
Planet / star radius ratio
0.216900
Semi-major axis / stellar radius
11.790
Impact parameter (b)
0.158
RV semi-amplitude (K)
173.000 m/s
Transit mid-time (BJD)
2,460,255.6055
Long. of periastron (ω)
114.00°
Angular separation (arcsec)
0.13100
Eq. Temperature
683K
(410 °C)
Insolation (S⊕)
51.70
Earth = 1.00
Earth Similarity (ESI)
0.220
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
Dransfield et al. 2026Instrument
TESS CCD Array
Publication
2026-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2026 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-5916
Spectral Class
M-type red dwarf
Effective Temperature
3,613 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.480 R☉
Stellar Mass
0.477 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.755 dex
Stellar density
6.560 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.980 mas
Total Proper Motion
27.106 mas/yr
PM Right Ascension
-8.93 mas/yr
PM Declination
-25.59 mas/yr
Galactic Cartesian (pc)
x = 0.811 · y = -0.561 · z = 0.167
Equatorial (J2000)
RA 325.29951° · Dec 9.59905°
Galactic ℓ, b
64.768° · -31.073°
Ecliptic λ, β
331.032° · 22.103°
HTM-20 index
-270111485
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