Key parameters at a glance
- A radius of 2.95 Earth radii
- A mass of 9.03 Earth masses
- Surface gravity around 1.04 g
- An orbital period of 19.105 days
- Equilibrium temperature 445 K (172 °C)
- Distance from Earth 119.41 light-years
- Earth Similarity Index 0.515
- Travel time at Voyager 1 speed 2,105,794 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-2459 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#555of 1978
top 28.0%
This planet
2.95R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-2459 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.95 | 11.21 |
| Mass (M⊕) | 1.00 | 9.03 | 317.83 |
| Density (g/cm³) | 5.51 | 1.93 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.04 | 2.53 |
| Insolation (S⊕) | 1.00 | 8.52 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 192790476
Gaia DR2
Gaia DR2 4807503030677131392
Gaia DR3
Gaia DR3 4807503030677131392
System
TOI-2459
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 19.10 Earth days (5.2% of a terrestrial year).
Transit Fingerprint
Depth
0.191 %
Duration
3.252 h
Impact parameter b
0.321
Rp / R★
0.040000
Transit midpoint (BJD)
2,458,452.3342
Photometric dip
Transit produces a flux drop of 1,906 ppm lasting ≈ 3.25 h.
Extended Orbital Architecture
Planet / star radius ratio
0.040000
Semi-major axis / stellar radius
44.432
Impact parameter (b)
0.321
Transit mid-time (BJD)
2,458,452.3342
Eq. Temperature
445K
(172 °C)
Insolation (S⊕)
8.52
Earth = 1.00
Earth Similarity (ESI)
0.515
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
2023-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2459
Spectral Class
K-type orange
Effective Temperature
4,195 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.675 R☉
Stellar Mass
0.660 M☉
Metallicity [Fe/H]
—
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
27.285 mas
Total Proper Motion
90.145 mas/yr
PM Right Ascension
88.58 mas/yr
PM Declination
16.75 mas/yr
Galactic Cartesian (pc)
x = 0.106 · y = 0.766 · z = -0.634
Equatorial (J2000)
RA 82.14333° · Dec -39.37305°
Galactic ℓ, b
244.247° · -32.183°
Ecliptic λ, β
76.788° · -62.453°
HTM-20 index
1233744491
Similar Worlds
Kepler-1728 b
Sub-Neptune · K-type orange
Radius 2.96 R⊕ · 2,125.8 ly
K2-270 c
Sub-Neptune · K-type orange
Radius 2.95 R⊕ · 914.9 ly
Kepler-735 b
Sub-Neptune · K-type orange
Radius 2.95 R⊕ · 2,267.0 ly
TOI-815 b
Sub-Neptune · K-type orange
Radius 2.94 R⊕ · 194.8 ly
Kepler-1086 c
Sub-Neptune · K-type orange
Radius 2.94 R⊕ · 1,520.2 ly
TOI-178 g
Sub-Neptune · K-type orange
Radius 2.94 R⊕ · 204.5 ly