Key parameters at a glance
- A radius of 12.23 Earth radii
- A mass of 1,910.15 Earth masses
- Surface gravity around 12.77 g
- An orbital period of 6.984 days
- Semi-major axis 0.0723 AU
- Equilibrium temperature 1,180 K (907 °C)
- Distance from Earth 760.81 light-years
- Earth Similarity Index 0.147
- Travel time at Voyager 1 speed 13,416,902 years
TOI-559 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1399of 1771
top 78.9%
This planet
12.23R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-559 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 12.23 | 11.21 |
| Mass (M⊕) | 1.00 | 1,910.15 | 317.83 |
| Density (g/cm³) | 5.51 | 5.74 | 1.33 |
| Surface Gravity (g) | 1.00 | 12.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 404.92 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 1,910.149 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 209459275
Gaia DR2
Gaia DR2 5057924844082070016
Gaia DR3
Gaia DR3 5057924844082070016
System
TOI-559
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.98 Earth days (1.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0723 AU.
Transit Fingerprint
Depth
0.828 %
Duration
5.150 h
Impact parameter b
0.230
Rp / R★
0.090970
Transit midpoint (BJD)
2,458,893.8131
Photometric dip
Transit produces a flux drop of 8,276 ppm lasting ≈ 5.15 h.
Extended Orbital Architecture
Planet / star radius ratio
0.090970
Semi-major axis / stellar radius
12.610
Impact parameter (b)
0.230
RV semi-amplitude (K)
633.000 m/s
Transit mid-time (BJD)
2,458,893.8131
Long. of periastron (ω)
-62.30°
Angular separation (arcsec)
0.31000
Eq. Temperature
1,180K
(907 °C)
Insolation (S⊕)
404.92
Earth = 1.00
Earth Similarity (ESI)
0.147
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Ikwut Ukwa et al. 2022Instrument
TESS CCD Array
Publication
2022-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-559
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,925 K — hotter than the Sun (5,778 K)
Estimated Age
6.80 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.233 R☉
Stellar Mass
1.026 M☉
Metallicity [Fe/H]
-0.07
Extended Stellar Properties
Surface gravity (log g)
4.268 dex
Stellar density
0.774 g/cm³
Rotational v·sin i
4.08 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.258 mas
Total Proper Motion
73.438 mas/yr
PM Right Ascension
-23.14 mas/yr
PM Declination
-69.70 mas/yr
Galactic Cartesian (pc)
x = 0.586 · y = 0.624 · z = -0.517
Equatorial (J2000)
RA 46.81862° · Dec -31.16300°
Galactic ℓ, b
228.915° · -60.184°
Ecliptic λ, β
32.048° · -46.301°
HTM-20 index
-1278849541
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