Key parameters at a glance

A radius of 2.45 Earth radii
A mass of 9.10 Earth masses
Surface gravity around 1.51 g
An orbital period of 5.904 days
Semi-major axis 0.0610 AU
Equilibrium temperature 862 K (589 °C)
Distance from Earth 552.58 light-years
Earth Similarity Index 0.307
Travel time at Voyager 1 speed 9,744,748 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around TOI-1246

TOI-1246 c shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-1246 b	Sub-Neptune	3.01	8.10	4.307	955	2022
TOI-1246 c this	Sub-Neptune	2.45	9.10	5.904	862	2022
TOI-1246 d	Sub-Neptune	3.43	5.40	18.655	588	2022
TOI-1246 e	Sub-Neptune	3.51	14.50	37.925	464	2022

TOI-1246 c Planet Profile

Physical Specs

Radius

2.45 R⊕

Radius (Jupiter)

0.219 R♃

Mass

9.10 M⊕

Mass (Jupiter)

0.029 M♃

Density

3.39 g/cm³

Surface Gravity

1.51 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.307

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

#1258of 1978

top 63.5%

This planet

2.45R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-2345 c 2.45 R⊕ Kepler-1176 b 2.45 R⊕ TOI-2274 b 2.45 R⊕

Metric	Earth	TOI-1246 c	Jupiter
Radius (R⊕)	1.00	2.45	11.21
Mass (M⊕)	1.00	9.10	317.83
Density (g/cm³)	5.51	3.39	1.33
Surface Gravity (g)	1.00	1.51	2.53
Insolation (S⊕)	1.00	129.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.100 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 230127302

Gaia DR2

Gaia DR2 1650110904522335744

Gaia DR3

Gaia DR3 1650110904522335744

System

TOI-1246

Percentile among Sub-Neptune cohort

Radius 2.451 R⊕ · percentile 36 / cohort 1978

Mass 9.100 M⊕ · percentile 66 / cohort 1978

Orbital period 5.90 d · percentile 17 / cohort 1946

Distance 169.42 pc · percentile 27 / cohort 1975

ESI 0.307 · percentile 30 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.904 days

Semi-major axis

0.0610 AU

Eccentricity

0.000

Inclination

89.30 °

Year Length

A year here lasts approximately 5.90 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0610 AU.

Transit Fingerprint

Depth

0.077 %

Duration

2.893 h

Impact parameter b

0.364

Rp / R★

0.025983

Transit midpoint (BJD)

2,458,683.4663

Photometric dip

Transit produces a flux drop of 774 ppm lasting ≈ 2.89 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025983

Semi-major axis / stellar radius

16.600

Impact parameter (b)

0.364

RV semi-amplitude (K)

3.480 m/s

Transit mid-time (BJD)

2,458,683.4663

Long. of periastron (ω)

90.00°

Angular separation (arcsec)

0.36000

Eq. Temperature

862K

(589 °C)

Insolation (S⊕)

129.00

Earth = 1.00

Earth Similarity (ESI)

0.307

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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

Turtelboom et al. 2022

Instrument

TESS CCD Array

Publication

2022-04

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-1246

Spectral Class

K-type orange

Effective Temperature

5,213 K — cooler than the Sun (5,778 K)

Estimated Age

6.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.865 R☉

Stellar Mass

0.889 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.510 dex

Stellar density

1.918 g/cm³

Rotational v·sin i

1.00 km/s

Rotation period

38.00 days

Metallicity ratio

[Fe/H]

Distance

169.42 parsec

Light-years 552.58 ly

V-band magnitude

11.63 mag

Voyager-speed travel 9,744,748 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

5.874 mas

Total Proper Motion

94.966 mas/yr

PM Right Ascension

-48.02 mas/yr

PM Declination

81.93 mas/yr

Galactic Cartesian (pc)

x = -0.108 · y = -0.317 · z = 0.942

Equatorial (J2000)

RA 251.11587° · Dec 70.42999°

Galactic ℓ, b

102.341° · 35.908°

Ecliptic λ, β

142.219° · 82.117°

HTM-20 index

-1212117917

Similar Worlds

TOI-2345 c

Sub-Neptune · K-type orange

Radius 2.45 R⊕ · 266.3 ly

TOI-913 b

Sub-Neptune · K-type orange

Radius 2.45 R⊕ · 212.6 ly

TOI-1798.01

Sub-Neptune · K-type orange

Radius 2.45 R⊕ · 369.1 ly

TOI-139 b

Sub-Neptune · K-type orange

Radius 2.46 R⊕ · 138.3 ly

TOI-5800 b

Sub-Neptune · K-type orange

Radius 2.46 R⊕ · 139.9 ly

Kepler-1388 e

Sub-Neptune · K-type orange

Radius 2.46 R⊕ · 1,480.1 ly

Explore Related Categories

Sub-Neptune Planets Transit Discoveries Transiting Exoplanet Survey Satellite (TESS) Mission K-type orange Hosts