Key parameters at a glance
- A radius of 5.33 Earth radii
- A mass of 34.40 Earth masses
- Surface gravity around 1.21 g
- An orbital period of 15.344 days
- Semi-major axis 0.1280 AU
- Equilibrium temperature 917 K (644 °C)
- Distance from Earth 645.81 light-years
- Earth Similarity Index 0.210
- Travel time at Voyager 1 speed 11,388,889 years
TOI-2019 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#338of 574
top 58.7%
This planet
5.33R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | TOI-2019 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.33 | 11.21 |
| Mass (M⊕) | 1.00 | 34.40 | 317.83 |
| Density (g/cm³) | 5.51 | 1.25 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.21 | 2.53 |
| Insolation (S⊕) | 1.00 | 126.05 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 34.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 159781361
Gaia DR2
Gaia DR2 1402405129651594624
Gaia DR3
Gaia DR3 1402405129651594624
System
TOI-2019
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 15.34 Earth days (4.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1280 AU.
Transit Fingerprint
Depth
0.067 %
Duration
7.573 h
Impact parameter b
0.312
Rp / R★
0.028007
Transit midpoint (BJD)
2,458,942.9420
Photometric dip
Transit produces a flux drop of 665 ppm lasting ≈ 7.57 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028007
Impact parameter (b)
0.312
RV semi-amplitude (K)
7.970 m/s
Transit mid-time (BJD)
2,458,942.9420
Long. of periastron (ω)
57.00°
Angular separation (arcsec)
0.64600
Eq. Temperature
917K
(644 °C)
Insolation (S⊕)
126.05
Earth = 1.00
Earth Similarity (ESI)
0.210
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-2019
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,626 K — cooler than the Sun (5,778 K)
Estimated Age
6.40 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.746 R☉
Stellar Mass
1.183 M☉
Metallicity [Fe/H]
0.41
Extended Stellar Properties
Surface gravity (log g)
4.025 dex
Stellar density
0.312 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
5.021 mas
Total Proper Motion
48.079 mas/yr
PM Right Ascension
12.35 mas/yr
PM Declination
-46.47 mas/yr
Galactic Cartesian (pc)
x = -0.382 · y = -0.534 · z = 0.754
Equatorial (J2000)
RA 234.43177° · Dec 48.95521°
Galactic ℓ, b
78.678° · 51.362°
Ecliptic λ, β
206.451° · 64.746°
HTM-20 index
-1442442764
Similar Worlds
K2-403 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.33 R⊕ · 804.3 ly
K2-108 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.33 R⊕ · 1,556.7 ly
Kepler-82 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.34 R⊕ · 2,949.5 ly
Kepler-33 d
Neptune-like · G-type yellow (Sun-like)
Radius 5.35 R⊕ · 3,943.7 ly
TOI-5174 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.35 R⊕ · 643.3 ly
Kepler-281 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.31 R⊕ · 5,692.9 ly