Key parameters at a glance

A radius of 3.83 Earth radii
A mass of 9.50 Earth masses
Surface gravity around 0.65 g
An orbital period of 12.999 days
Semi-major axis 0.1070 AU
Equilibrium temperature 870 K (597 °C)
Distance from Earth 506.00 light-years
Earth Similarity Index 0.228
Travel time at Voyager 1 speed 8,923,339 years

1 sibling around TOI-1422

TOI-1422 b 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 this	Sub-Neptune	3.83	9.50	12.999	870	2022
TOI-1422 c	Sub-Neptune	2.61	14.00	34.563	628	2025

TOI-1422 b Planet Profile

Physical Specs

Radius

3.83 R⊕

Radius (Jupiter)

0.342 R♃

Mass

9.50 M⊕

Mass (Jupiter)

0.030 M♃

Density

0.93 g/cm³

Surface Gravity

0.65 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.228

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#49of 1978

top 2.4%

This planet

3.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-293 c 3.83 R⊕ HD 20781 e 3.83 R⊕ Kepler-232 c 3.83 R⊕

Metric	Earth	TOI-1422 b	Jupiter
Radius (R⊕)	1.00	3.83	11.21
Mass (M⊕)	1.00	9.50	317.83
Density (g/cm³)	5.51	0.93	1.33
Surface Gravity (g)	1.00	0.65	2.53
Insolation (S⊕)	1.00	90.52	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.500 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

Radius 3.830 R⊕ · percentile 97 / cohort 1978

Mass 9.500 M⊕ · percentile 69 / cohort 1978

Orbital period 13.00 d · percentile 44 / cohort 1946

Distance 155.14 pc · percentile 26 / cohort 1975

ESI 0.228 · percentile 12 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.999 days

Semi-major axis

0.1070 AU

Eccentricity

0.200

Inclination

89.53 °

Year Length

A year here lasts approximately 13.00 Earth days (3.6% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1070 AU.

Transit Fingerprint

Depth

0.134 %

Duration

4.460 h

Impact parameter b

0.190

Rp / R★

0.035600

Transit midpoint (BJD)

2,458,745.9405

Photometric dip

Transit produces a flux drop of 1,340 ppm lasting ≈ 4.46 h.

Extended Orbital Architecture

Planet / star radius ratio

0.035600

Semi-major axis / stellar radius

22.510

Impact parameter (b)

0.190

RV semi-amplitude (K)

2.640 m/s

Transit mid-time (BJD)

2,458,745.9405

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.69000

Eq. Temperature

870K

(597 °C)

Insolation (S⊕)

90.52

Earth = 1.00

Earth Similarity (ESI)

0.228

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.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Naponiello et al. 2022

Instrument

TESS CCD Array

Publication

2022-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1452 b · Super-Earth TOI-712 d · Sub-Neptune TOI-1468 c · Sub-Neptune TOI-2136 b · Sub-Neptune LTT 1445 A c · Rocky Terrestrial TOI-712 c · Sub-Neptune LP 890-9 b · Super-Earth TOI-2081 b · Sub-Neptune GJ 3929 b · Rocky Terrestrial HD 260655 c · Super-Earth HD 73583 c · Sub-Neptune TOI-1759 b · Sub-Neptune

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]

Distance

155.14 parsec

Light-years 506.00 ly

V-band magnitude

10.62 mag

Voyager-speed travel 8,923,339 yr

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