Key parameters at a glance

A radius of 8.00 Earth radii
A mass of 38.46 Earth masses
Surface gravity around 0.60 g
An orbital period of 20.381 days
Semi-major axis 0.1597 AU
Equilibrium temperature 966 K (693 °C)
Distance from Earth 625.07 light-years
Earth Similarity Index 0.148
Travel time at Voyager 1 speed 11,023,192 years

1 sibling around TOI-1836

TOI-1836 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-1836 c	Sub-Neptune	2.60	8.00	1.773	2,008	2024
TOI-1836 b this	Neptune-like	8.00	38.46	20.381	966	2024

TOI-1836 b Planet Profile

Physical Specs

Radius

8.00 R⊕

Radius (Jupiter)

0.714 R♃

Mass

38.46 M⊕

Mass (Jupiter)

0.121 M♃

Density

0.41 g/cm³

Surface Gravity

0.60 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.148

HZ Position Inner

Controversial No

Discovery

Year 2024

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#155of 574

top 26.8%

This planet

8.00R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-216.02 8.00 R⊕ Kepler-1487 c 7.97 R⊕ TOI-1775 b 8.05 R⊕

Metric	Earth	TOI-1836 b	Jupiter
Radius (R⊕)	1.00	8.00	11.21
Mass (M⊕)	1.00	38.46	317.83
Density (g/cm³)	5.51	0.41	1.33
Surface Gravity (g)	1.00	0.60	2.53
Insolation (S⊕)	1.00	153.52	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	38.457 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 148193

TIC

TIC 207468071

Gaia DR2

Gaia DR2 1428639816392087552

Gaia DR3

Gaia DR3 1428639816392087552

System

TOI-1836

Percentile among Neptune-like cohort

Radius 8.003 R⊕ · percentile 73 / cohort 574

Mass 38.457 M⊕ · percentile 61 / cohort 574

Orbital period 20.38 d · percentile 52 / cohort 524

Distance 191.65 pc · percentile 38 / cohort 572

ESI 0.148 · percentile 13 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

20.381 days

Semi-major axis

0.1597 AU

Eccentricity

0.000

Inclination

88.74 °

Year Length

A year here lasts approximately 20.38 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1597 AU.

Transit Fingerprint

Depth

0.216 %

Duration

6.653 h

Impact parameter b

0.480

Rp / R★

0.046510

Transit midpoint (BJD)

2,459,646.4935

Photometric dip

Transit produces a flux drop of 2,164 ppm lasting ≈ 6.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.046510

Semi-major axis / stellar radius

20.200

Impact parameter (b)

0.480

RV semi-amplitude (K)

7.500 m/s

Transit mid-time (BJD)

2,459,646.4935

Long. of periastron (ω)

90.00°

Sky-projected obliquity (λ)

14.00°

Angular separation (arcsec)

0.83300

Eq. Temperature

966K

(693 °C)

Insolation (S⊕)

153.52

Earth = 1.00

Earth Similarity (ESI)

0.148

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

Polanski et al. 2024

Instrument

TESS CCD Array

Publication

2024-06

Observation locale

Space

Discovery cohort

Planets confirmed in 2024 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

Gliese 12 b · Rocky Terrestrial TOI-6002 b · Super-Earth TOI-5713 b · Super-Earth TOI-4336 A b · Sub-Neptune TOI-406.01 · Sub-Neptune TOI-1224 c · Sub-Neptune LHS 1678 d · Rocky Terrestrial TOI-2088 b · Sub-Neptune TOI-2120 b · Sub-Neptune TOI-1806.01 · Sub-Neptune TOI-4633 c · Sub-Neptune TOI-260 b · Super-Earth

Host System: TOI-1836

Spectral Class

F-type yellow-white

Effective Temperature

6,380 K — hotter than the Sun (5,778 K)

Estimated Age

6.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.577 R☉

Stellar Mass

1.307 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.159 dex

Stellar density

0.470 g/cm³

Rotational v·sin i

4.00 km/s

Rotation period

20.00 days

Activity index (log R'HK)

-5.000

Metallicity ratio

[Fe/H]

Distance

191.65 parsec

Light-years 625.07 ly

V-band magnitude

9.77 mag

Voyager-speed travel 11,023,192 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

5.189 mas

Total Proper Motion

82.588 mas/yr

PM Right Ascension

-38.23 mas/yr

PM Declination

73.21 mas/yr

Galactic Cartesian (pc)

x = -0.236 · y = -0.528 · z = 0.816

Equatorial (J2000)

RA 245.90792° · Dec 54.69008°

Galactic ℓ, b

83.805° · 42.948°

Ecliptic λ, β

214.057° · 73.453°

HTM-20 index

-335099315