Key parameters at a glance
- A radius of 2.50 Earth radii
- A mass of 10.50 Earth masses
- Surface gravity around 1.68 g
- An orbital period of 17.468 days
- Semi-major axis 0.1220 AU
- Equilibrium temperature 641 K (368 °C)
- Distance from Earth 196.81 light-years
- Earth Similarity Index 0.413
- Travel time at Voyager 1 speed 3,470,716 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-757 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1168of 1978
top 59.0%
This planet
2.50R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-757 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.50 | 11.21 |
| Mass (M⊕) | 1.00 | 10.50 | 317.83 |
| Density (g/cm³) | 5.51 | 3.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.68 | 2.53 |
| Insolation (S⊕) | 1.00 | 24.36 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 10.500 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 130924120
Gaia DR2
Gaia DR2 6157753406084087168
Gaia DR3
Gaia DR3 6157753406084087168
System
TOI-757
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.47 Earth days (4.8% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1220 AU.
Transit Fingerprint
Depth
0.093 %
Duration
3.720 h
Impact parameter b
0.300
Rp / R★
0.029900
Transit midpoint (BJD)
2,459,305.5322
Photometric dip
Transit produces a flux drop of 926 ppm lasting ≈ 3.72 h.
Extended Orbital Architecture
Planet / star radius ratio
0.029900
Impact parameter (b)
0.300
RV semi-amplitude (K)
3.300 m/s
Transit mid-time (BJD)
2,459,305.5322
Long. of periastron (ω)
-36.00°
Angular separation (arcsec)
2.02000
Eq. Temperature
641K
(368 °C)
Insolation (S⊕)
24.36
Earth = 1.00
Earth Similarity (ESI)
0.413
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
Alqasim et al. 2024Instrument
TESS CCD Array
Publication
2024-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-757
Spectral Class
K-type orange
Effective Temperature
5,278 K — cooler than the Sun (5,778 K)
Estimated Age
7.50 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.800 M☉
Metallicity [Fe/H]
-0.27
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
2.400 g/cm³
Rotational v·sin i
2.40 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
16.544 mas
Total Proper Motion
117.406 mas/yr
PM Right Ascension
47.94 mas/yr
PM Declination
107.18 mas/yr
Galactic Cartesian (pc)
x = -0.806 · y = -0.113 · z = -0.581
Equatorial (J2000)
RA 187.99484° · Dec -35.55445°
Galactic ℓ, b
298.485° · 27.149°
Ecliptic λ, β
202.581° · -29.241°
HTM-20 index
1162303820
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