Key parameters at a glance
- A radius of 11.89 Earth radii
- A mass of 25.10 Earth masses
- Surface gravity around 0.18 g
- An orbital period of 6.956 days
- Semi-major axis 0.0710 AU
- Equilibrium temperature 957 K (684 °C)
- Distance from Earth 658.57 light-years
- Earth Similarity Index 0.098
- Travel time at Voyager 1 speed 11,613,840 years
TOI-1420 b Planet Profile
Physical Specs
Classification
Planet Type
Gas Giant
Discovery
Size rank in cohort
Rank by radius
#1546of 1771
top 87.2%
This planet
11.89R⊕
Gas Giant median
13.52R⊕
Nearest-size peers
| Metric | Earth | TOI-1420 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 11.89 | 11.21 |
| Mass (M⊕) | 1.00 | 25.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.08 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 139.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 25.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 321857016
Gaia DR2
Gaia DR2 2221164434736927360
Gaia DR3
Gaia DR3 2221164434736927360
System
TOI-1420
Percentile among Gas Giant cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.96 Earth days (1.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0710 AU.
Transit Fingerprint
Depth
1.396 %
Duration
3.372 h
Impact parameter b
0.412
Rp / R★
0.118160
Transit midpoint (BJD)
2,459,517.4331
Photometric dip
Transit produces a flux drop of 13,960 ppm lasting ≈ 3.37 h.
Extended Orbital Architecture
Planet / star radius ratio
0.118160
Semi-major axis / stellar radius
16.530
Impact parameter (b)
0.412
RV semi-amplitude (K)
8.500 m/s
Transit mid-time (BJD)
2,459,517.4331
Long. of periastron (ω)
-165.00°
Angular separation (arcsec)
0.35200
Eq. Temperature
957K
(684 °C)
Insolation (S⊕)
139.00
Earth = 1.00
Earth Similarity (ESI)
0.098
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
Yoshida et al. 2023Instrument
TESS CCD Array
Publication
2023-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-1420
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,510 K — cooler than the Sun (5,778 K)
Estimated Age
10.70 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.923 R☉
Stellar Mass
0.987 M☉
Metallicity [Fe/H]
0.28
Extended Stellar Properties
Surface gravity (log g)
4.502 dex
Stellar density
1.770 g/cm³
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.924 mas
Total Proper Motion
55.508 mas/yr
PM Right Ascension
45.33 mas/yr
PM Declination
32.04 mas/yr
Galactic Cartesian (pc)
x = 0.320 · y = -0.242 · z = 0.916
Equatorial (J2000)
RA 322.94181° · Dec 66.34901°
Galactic ℓ, b
104.722° · 10.824°
Ecliptic λ, β
24.000° · 69.485°
HTM-20 index
1456991300
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