Key parameters at a glance
- A radius of 16.14 Earth radii
- A mass of 222.48 Earth masses
- Surface gravity around 0.85 g
- An orbital period of 3.209 days
- Semi-major axis 0.0488 AU
- Equilibrium temperature 1,927 K (1654 °C)
- Distance from Earth 747.12 light-years
- Earth Similarity Index 0.052
- Travel time at Voyager 1 speed 13,175,386 years
TOI-1789 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#150of 1771
top 8.4%
This planet
16.14R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1789 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 16.14 | 11.21 |
| Mass (M⊕) | 1.00 | 222.48 | 317.83 |
| Density (g/cm³) | 5.51 | 0.28 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.85 | 2.53 |
| Insolation (S⊕) | 1.00 | 2,300.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 222.480 M⊕ | Direct mass measurement (not derived). |
| Minimum mass (M sin i) | 216.123 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 82139
TIC
TIC 172518755
Gaia DR2
Gaia DR2 646125297938578944
Gaia DR3
Gaia DR3 646125297938578944
System
TOI-1789
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.21 Earth days (0.9% of a terrestrial year) at a mean orbital distance of 0.0488 AU.
Transit Fingerprint
Depth
0.463 %
Duration
2.300 h
Impact parameter b
0.972
Rp / R★
0.068000
Transit midpoint (BJD)
2,458,873.6537
Photometric dip
Transit produces a flux drop of 4,630 ppm lasting ≈ 2.30 h.
Extended Orbital Architecture
Planet / star radius ratio
0.068000
Semi-major axis / stellar radius
4.830
Impact parameter (b)
0.972
RV semi-amplitude (K)
72.000 m/s
Transit mid-time (BJD)
2,458,873.6537
Angular separation (arcsec)
0.21300
Eq. Temperature
1,927K
(1654 °C)
Insolation (S⊕)
2,300.00
Earth = 1.00
Earth Similarity (ESI)
0.052
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
Khandelwal 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-1789
Spectral Class
F-type yellow-white
Effective Temperature
5,991 K — hotter than the Sun (5,778 K)
Estimated Age
2.73 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
2.168 R☉
Stellar Mass
1.507 M☉
Metallicity [Fe/H]
0.37
Extended Stellar Properties
Surface gravity (log g)
3.943 dex
Stellar density
0.208 g/cm³
Rotational v·sin i
7.00 km/s
Rotation period
15.70 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.337 mas
Total Proper Motion
40.346 mas/yr
PM Right Ascension
-8.00 mas/yr
PM Declination
-39.54 mas/yr
Galactic Cartesian (pc)
x = -0.712 · y = 0.542 · z = 0.447
Equatorial (J2000)
RA 142.74341° · Dec 26.54000°
Galactic ℓ, b
201.719° · 45.586°
Ecliptic λ, β
136.542° · 11.217°
HTM-20 index
2070472096
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