Confirmed Exoplanet Discovered 2022

TOI-1246 b

A sub-neptune orbiting the k-type orange TOI-1246, located approximately 552.6 light-years from Earth.

Key parameters at a glance

  • A radius of 3.01 Earth radii
  • A mass of 8.10 Earth masses
  • Surface gravity around 0.89 g
  • An orbital period of 4.307 days
  • Semi-major axis 0.0490 AU
  • Equilibrium temperature 955 K (682 °C)
  • Distance from Earth 552.58 light-years
  • Earth Similarity Index 0.239
  • 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 b 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 this Sub-Neptune 3.01 8.10 4.307 955 2022
TOI-1246 c 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 b Planet Profile

Physical Specs

Radius
3.01 R⊕
Radius (Jupiter)
0.269 R♃
Mass
8.10 M⊕
Mass (Jupiter)
0.025 M♃
Density
1.63 g/cm³
Surface Gravity
0.89 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.239
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

#509of 1978

top 25.7%

This planet

3.01R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-679 b 3.01 R⊕ Kepler-1036 b 3.01 R⊕ Kepler-414 c 3.01 R⊕
Metric Earth TOI-1246 b Jupiter
Radius (R⊕)1.003.0111.21
Mass (M⊕)1.008.10317.83
Density (g/cm³)5.511.631.33
Surface Gravity (g)1.000.892.53
Insolation (S⊕)1.00196.000.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 8.100 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 3.010 R⊕ · percentile 74 / cohort 1978
Mass 8.100 M⊕ · percentile 55 / cohort 1978
Orbital period 4.31 d · percentile 10 / cohort 1946
Distance 169.42 pc · percentile 27 / cohort 1975
ESI 0.239 · percentile 14 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period
4.307 days
Semi-major axis
0.0490 AU
Eccentricity
—
Inclination
87.90 °

Year Length

A year here lasts approximately 4.31 Earth days (1.2% of a terrestrial year) at a mean orbital distance of 0.0490 AU.

Transit Fingerprint

Depth

0.109 %

Duration

2.338 h

Impact parameter b

0.490

Rp / R★

0.031000

Transit midpoint (BJD)

2,458,686.5658

Photometric dip

Transit produces a flux drop of 1,095 ppm lasting ≈ 2.34 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031000

Semi-major axis / stellar radius

13.400

Impact parameter (b)

0.490

RV semi-amplitude (K)

3.440 m/s

Transit mid-time (BJD)

2,458,686.5658

Angular separation (arcsec)

0.28900

Eq. Temperature

955K

(682 °C)

Insolation (S⊕)

196.00

Earth = 1.00

Earth Similarity (ESI)

0.239

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

5,151 K — cooler than the Sun (5,778 K)

Estimated Age

6.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.860 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.400 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

9.112.612.58B11.63V11.73Gaia11.18TESS10.29J10.00H9.91K9.75W19.79W29.79W39.07W4

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

HD 3167 c

Sub-Neptune · K-type orange

Radius 3.00 R⊕ · 154.2 ly

K2-136 c

Sub-Neptune · K-type orange

Radius 3.00 R⊕ · 193.2 ly

Kepler-248 b

Sub-Neptune · K-type orange

Radius 3.02 R⊕ · 2,409.6 ly

TOI-4010 b

Sub-Neptune · K-type orange

Radius 3.02 R⊕ · 578.9 ly

HD 216520 c

Sub-Neptune · K-type orange

Radius 3.03 R⊕ · 63.8 ly

Kepler-1341 b

Sub-Neptune · K-type orange

Radius 2.99 R⊕ · 1,555.6 ly

Explore Related Categories

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