Key parameters at a glance
- A radius of 1.95 Earth radii
- A mass of 4.45 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 8.303 days
- Semi-major axis 0.0739 AU
- Equilibrium temperature 756 K (482 °C)
- Distance from Earth 231.51 light-years
- Earth Similarity Index 0.368
- Travel time at Voyager 1 speed 4,082,709 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-1739 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#77of 1176
top 6.5%
This planet
1.95R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | TOI-1739 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.95 | 11.21 |
| Mass (M⊕) | 1.00 | 4.45 | 317.83 |
| Density (g/cm³) | 5.51 | 3.32 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 53.91 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159418353
Gaia DR2
Gaia DR2 1723044195148593152
Gaia DR3
Gaia DR3 1723044195149081728
System
TOI-1739
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.30 Earth days (2.3% of a terrestrial year) at a mean orbital distance of 0.0739 AU.
Transit Fingerprint
Depth
0.043 %
Duration
1.871 h
Impact parameter b
0.410
Rp / R★
0.022600
Transit midpoint (BJD)
2,459,631.8204
Photometric dip
Transit produces a flux drop of 430 ppm lasting ≈ 1.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022600
Semi-major axis / stellar radius
32.460
Impact parameter (b)
0.410
Transit mid-time (BJD)
2,459,631.8204
Angular separation (arcsec)
1.04000
Eq. Temperature
756K
(482 °C)
Insolation (S⊕)
53.91
Earth = 1.00
Earth Similarity (ESI)
0.368
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.
Discovery Paper
Primary reference
Mistry et al. 2023Instrument
TESS CCD Array
Publication
2023-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1739
Spectral Class
K-type orange
Effective Temperature
4,814 K — cooler than the Sun (5,778 K)
Estimated Age
6.30 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.781 R☉
Stellar Mass
0.780 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.584 dex
Stellar density
2.630 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
14.059 mas
Total Proper Motion
171.152 mas/yr
PM Right Ascension
-132.92 mas/yr
PM Declination
107.83 mas/yr
Galactic Cartesian (pc)
x = -0.058 · y = -0.102 · z = 0.993
Equatorial (J2000)
RA 240.17248° · Dec 83.25866°
Galactic ℓ, b
117.119° · 31.578°
Ecliptic λ, β
100.953° · 72.110°
HTM-20 index
-1366273055
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K2-285 e
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