Key parameters at a glance
- A radius of 12.11 Earth radii
- A mass of 1,112.40 Earth masses
- Surface gravity around 7.59 g
- An orbital period of 61.628 days
- Semi-major axis 0.3000 AU
- Equilibrium temperature 592 K (319 °C)
- Distance from Earth 653.20 light-years
- Earth Similarity Index 0.295
- Travel time at Voyager 1 speed 11,519,224 years
TOI-2589 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1451of 1771
top 81.9%
This planet
12.11R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-2589 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.11 | 11.21 |
| Mass (M⊕) | 1.00 | 1,112.40 | 317.83 |
| Density (g/cm³) | 5.51 | 3.45 | 1.33 |
| Surface Gravity (g) | 1.00 | 7.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 21.75 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,112.399 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 157698565
Gaia DR2
Gaia DR2 5566108398204103424
Gaia DR3
Gaia DR3 5566108398204103424
System
TOI-2589
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 61.63 Earth days (16.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.3000 AU.
Transit Fingerprint
Depth
0.888 %
Duration
6.401 h
Impact parameter b
0.878
Rp / R★
0.107000
Transit midpoint (BJD)
2,458,494.5790
Photometric dip
Transit produces a flux drop of 8,878 ppm lasting ≈ 6.40 h.
Extended Orbital Architecture
Planet / star radius ratio
0.107000
Semi-major axis / stellar radius
61.200
Impact parameter (b)
0.878
RV semi-amplitude (K)
221.000 m/s
Transit mid-time (BJD)
2,458,494.5790
Long. of periastron (ω)
218.00°
Angular separation (arcsec)
1.50000
Eq. Temperature
592K
(319 °C)
Insolation (S⊕)
21.75
Earth = 1.00
Earth Similarity (ESI)
0.295
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
Brahm et al. 2023Instrument
TESS CCD Array
Publication
2023-04
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-2589
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,579 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.070 R☉
Stellar Mass
0.930 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.350 dex
Stellar density
1.140 g/cm³
Rotational v·sin i
2.20 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.964 mas
Total Proper Motion
20.727 mas/yr
PM Right Ascension
-18.98 mas/yr
PM Declination
8.32 mas/yr
Galactic Cartesian (pc)
x = -0.239 · y = 0.759 · z = -0.605
Equatorial (J2000)
RA 107.48815° · Dec -37.23095°
Galactic ℓ, b
248.513° · -12.633°
Ecliptic λ, β
117.679° · -59.001°
HTM-20 index
824988455
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