Key parameters at a glance
- A radius of 14.41 Earth radii
- A mass of 375.04 Earth masses
- Surface gravity around 1.80 g
- An orbital period of 2.085 days
- Semi-major axis 0.0314 AU
- Equilibrium temperature 1,588 K (1315 °C)
- Distance from Earth 1,160.08 light-years
- Earth Similarity Index 0.079
- Travel time at Voyager 1 speed 20,458,035 years
TOI-157 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#288of 1771
top 16.2%
This planet
14.41R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-157 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 14.41 | 11.21 |
| Mass (M⊕) | 1.00 | 375.04 | 317.83 |
| Density (g/cm³) | 5.51 | 0.69 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.80 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,062.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 375.039 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 140691463
Gaia DR2
Gaia DR2 4624979393181971328
Gaia DR3
Gaia DR3 4624979393181971328
System
TOI-157
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 2.08 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0314 AU.
Transit Fingerprint
Depth
1.283 %
Duration
2.146 h
Impact parameter b
0.805
Rp / R★
0.113290
Transit midpoint (BJD)
2,458,326.5477
Photometric dip
Transit produces a flux drop of 12,830 ppm lasting ≈ 2.15 h.
Extended Orbital Architecture
Planet / star radius ratio
0.113290
Semi-major axis / stellar radius
5.785
Impact parameter (b)
0.805
RV semi-amplitude (K)
192.000 m/s
Transit mid-time (BJD)
2,458,326.5477
Angular separation (arcsec)
0.08820
Eq. Temperature
1,588K
(1315 °C)
Insolation (S⊕)
1,062.00
Earth = 1.00
Earth Similarity (ESI)
0.079
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
Nielsen et al. 2020Instrument
TESS CCD Array
Publication
2020-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-157
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,404 K — cooler than the Sun (5,778 K)
Estimated Age
12.82 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.167 R☉
Stellar Mass
0.948 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.281 dex
Stellar density
0.842 g/cm³
Systemic radial velocity
-6.11 km/s
Rotational v·sin i
2.50 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
2.783 mas
Total Proper Motion
22.254 mas/yr
PM Right Ascension
11.71 mas/yr
PM Declination
-18.92 mas/yr
Galactic Cartesian (pc)
x = 0.065 · y = 0.221 · z = -0.973
Equatorial (J2000)
RA 73.70144° · Dec -76.68061°
Galactic ℓ, b
289.063° · -32.930°
Ecliptic λ, β
289.337° · -78.742°
HTM-20 index
-1239837352
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