Key parameters at a glance
- A radius of 2.61 Earth radii
- A mass of 14.00 Earth masses
- Surface gravity around 2.06 g
- An orbital period of 34.563 days
- Semi-major axis 0.2050 AU
- Equilibrium temperature 628 K (355 °C)
- Distance from Earth 506.00 light-years
- Earth Similarity Index 0.425
- Travel time at Voyager 1 speed 8,923,339 years
1 sibling around TOI-1422
TOI-1422 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| TOI-1422 b | Sub-Neptune | 3.83 | 9.50 | 12.999 | 870 | 2022 |
| TOI-1422 c this | Sub-Neptune | 2.61 | 14.00 | 34.563 | 628 | 2025 |
TOI-1422 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#999of 1978
top 50.5%
This planet
2.61R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-1422 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.61 | 11.21 |
| Mass (M⊕) | 1.00 | 14.00 | 317.83 |
| Density (g/cm³) | 5.51 | 4.30 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.06 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 14.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 333473672
Gaia DR2
Gaia DR2 1920333449169516288
Gaia DR3
Gaia DR3 1920333449169516288
System
TOI-1422
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 34.56 Earth days (9.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.2050 AU.
Transit Fingerprint
Duration
6.120 h
Impact parameter b
0.170
Transit midpoint (BJD)
2,458,756.3525
Extended Orbital Architecture
Semi-major axis / stellar radius
43.200
Impact parameter (b)
0.170
RV semi-amplitude (K)
2.800 m/s
Transit mid-time (BJD)
2,458,756.3525
Long. of periastron (ω)
90.00°
Angular separation (arcsec)
1.32000
Eq. Temperature
628K
(355 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.425
0 = alien, 1 = Earth-identical
Insufficient insolation data — 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
Naponiello et al. 2025Instrument
HARPS-N Spectrograph
Publication
2025-11
Observation locale
Ground
Discovery cohort
Planets confirmed in 2025 at Roque de los Muchachos Observatory (3 shown).
Host System: TOI-1422
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,840 K — hotter than the Sun (5,778 K)
Estimated Age
4.60 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.019 R☉
Stellar Mass
0.990 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.412 dex
Stellar density
1.277 g/cm³
Systemic radial velocity
-25.95 km/s
Rotational v·sin i
1.70 km/s
Activity index (log R'HK)
-4.942
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
6.417 mas
Total Proper Motion
74.357 mas/yr
PM Right Ascension
-67.55 mas/yr
PM Declination
-31.09 mas/yr
Galactic Cartesian (pc)
x = 0.766 · y = -0.077 · z = 0.638
Equatorial (J2000)
RA 354.24083° · Dec 39.63928°
Galactic ℓ, b
107.661° · -21.014°
Ecliptic λ, β
13.420° · 38.028°
HTM-20 index
-1511165985
Similar Worlds
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Kepler-284 c
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Kepler-1187 b
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TOI-2048 b
Sub-Neptune · G-type yellow (Sun-like)
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