Key parameters at a glance
- A radius of 3.89 Earth radii
- A mass of 16.00 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 4.324 days
- Semi-major axis 0.0487 AU
- Equilibrium temperature 1,120 K (847 °C)
- Distance from Earth 497.72 light-years
- Earth Similarity Index 0.145
- Travel time at Voyager 1 speed 8,777,244 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around TOI-942
TOI-942 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-942 b this | Sub-Neptune | 3.89 | 16.00 | 4.324 | 1,120 | 2020 |
| TOI-942 c | Neptune-like | 4.67 | 37.00 | 10.156 | — | 2020 |
TOI-942 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#28of 1978
top 1.4%
This planet
3.89R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-942 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.89 | 11.21 |
| Mass (M⊕) | 1.00 | 16.00 | 317.83 |
| Density (g/cm³) | 5.51 | — | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 261.86 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 16.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 146520535
Gaia DR2
Gaia DR2 2974906868489280768
Gaia DR3
Gaia DR3 2974906868489280768
System
TOI-942
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.32 Earth days (1.2% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.0487 AU.
Transit Fingerprint
Depth
0.148 %
Duration
3.403 h
Impact parameter b
0.050
Rp / R★
0.039950
Transit midpoint (BJD)
2,458,441.5790
Photometric dip
Transit produces a flux drop of 1,480 ppm lasting ≈ 3.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.039950
Semi-major axis / stellar radius
10.120
Impact parameter (b)
0.050
RV semi-amplitude (K)
7.000 m/s
Transit mid-time (BJD)
2,458,441.5790
Long. of periastron (ω)
-16.00°
Sky-projected obliquity (λ)
1.00°
True obliquity (ψ)
2.00°
Angular separation (arcsec)
0.31900
Eq. Temperature
1,120K
(847 °C)
Insolation (S⊕)
261.86
Earth = 1.00
Earth Similarity (ESI)
0.145
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Carleo et al. 2021Instrument
TESS CCD Array
Publication
2021-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-942
Spectral Class
K-type orange
Effective Temperature
4,969 K — cooler than the Sun (5,778 K)
Estimated Age
0.05 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.894 R☉
Stellar Mass
0.822 M☉
Metallicity [Fe/H]
-0.22
Extended Stellar Properties
Surface gravity (log g)
4.314 dex
Stellar density
1.634 g/cm³
Systemic radial velocity
25.32 km/s
Rotational v·sin i
14.24 km/s
Rotation period
3.39 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 14 bands
Astrometric Data
Parallax
6.524 mas
Total Proper Motion
15.887 mas/yr
PM Right Ascension
15.38 mas/yr
PM Declination
-3.98 mas/yr
Galactic Cartesian (pc)
x = 0.217 · y = 0.913 · z = -0.346
Equatorial (J2000)
RA 76.64962° · Dec -20.24561°
Galactic ℓ, b
220.981° · -31.775°
Ecliptic λ, β
72.797° · -42.891°
HTM-20 index
-510592518
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