Key parameters at a glance
- A radius of 2.37 Earth radii
- A mass of 9.70 Earth masses
- Surface gravity around 1.73 g
- An orbital period of 21.269 days
- Semi-major axis 0.1540 AU
- Equilibrium temperature 694 K (421 °C)
- Distance from Earth 237.73 light-years
- Earth Similarity Index 0.392
- Travel time at Voyager 1 speed 4,192,292 years
TOI-1742 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1392of 1978
top 70.3%
This planet
2.37R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1742 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.37 | 11.21 |
| Mass (M⊕) | 1.00 | 9.70 | 317.83 |
| Density (g/cm³) | 5.51 | 4.00 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.73 | 2.53 |
| Insolation (S⊕) | 1.00 | 58.62 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 9.700 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 219857012
Gaia DR2
Gaia DR2 1651818622174190208
Gaia DR3
Gaia DR3 1651818622174190208
System
TOI-1742
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 21.27 Earth days (5.8% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1540 AU.
Transit Fingerprint
Depth
0.035 %
Duration
6.292 h
Impact parameter b
0.265
Rp / R★
0.019171
Transit midpoint (BJD)
2,458,725.3518
Photometric dip
Transit produces a flux drop of 350 ppm lasting ≈ 6.29 h.
Extended Orbital Architecture
Planet / star radius ratio
0.019171
Impact parameter (b)
0.265
RV semi-amplitude (K)
2.250 m/s
Transit mid-time (BJD)
2,458,725.3518
Long. of periastron (ω)
37.00°
Angular separation (arcsec)
2.11000
Eq. Temperature
694K
(421 °C)
Insolation (S⊕)
58.62
Earth = 1.00
Earth Similarity (ESI)
0.392
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Polanski et al. 2024Instrument
TESS CCD Array
Publication
2024-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1742
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,815 K — hotter than the Sun (5,778 K)
Estimated Age
3.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.131 R☉
Stellar Mass
1.086 M☉
Metallicity [Fe/H]
0.19
Extended Stellar Properties
Surface gravity (log g)
4.365 dex
Stellar density
1.050 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
13.691 mas
Total Proper Motion
67.739 mas/yr
PM Right Ascension
24.20 mas/yr
PM Declination
63.27 mas/yr
Galactic Cartesian (pc)
x = -0.068 · y = -0.303 · z = 0.950
Equatorial (J2000)
RA 257.32887° · Dec 71.87667°
Galactic ℓ, b
103.250° · 33.551°
Ecliptic λ, β
124.410° · 83.066°
HTM-20 index
-1229159126
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Kepler-558 b
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