Key parameters at a glance

A radius of 2.53 Earth radii
A mass of 5.60 Earth masses
Surface gravity around 0.87 g
An orbital period of 39.545 days
Semi-major axis 0.2290 AU
Equilibrium temperature 574 K (301 °C)
Distance from Earth 275.72 light-years
Earth Similarity Index 0.423
Travel time at Voyager 1 speed 4,862,320 years

Context from the literature

TOI-1136 is a G-type main-sequence star 276 light-years away in the constellation Draco. It is slightly smaller than the Sun and similar in mass and temperature, but is much younger, with an age of about 700 million years. It hosts a system of at least six, and possibly seven, exoplanets.

Excerpted from Wikipedia · full article

5 siblings around TOI-1136

TOI-1136 g shares its host star with 5 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
TOI-1136 b	Super-Earth	1.90	3.50	4.173	1,216	2022
TOI-1136 c	Sub-Neptune	2.88	6.32	6.257	1,062	2022
TOI-1136 d	Neptune-like	4.63	8.35	12.520	843	2022
TOI-1136 e	Sub-Neptune	2.64	6.07	18.801	737	2022
TOI-1136 f	Sub-Neptune	3.74	9.70	26.321	658	2022
TOI-1136 g this	Sub-Neptune	2.53	5.60	39.545	574	2022

TOI-1136 g Planet Profile

Physical Specs

Radius

2.53 R⊕

Radius (Jupiter)

0.226 R♃

Mass

5.60 M⊕

Mass (Jupiter)

0.018 M♃

Density

1.90 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.423

HZ Position Unknown

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

#1133of 1978

top 57.2%

This planet

2.53R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-204 b 2.53 R⊕ Kepler-313 b 2.53 R⊕ Kepler-896 b 2.53 R⊕

Metric	Earth	TOI-1136 g	Jupiter
Radius (R⊕)	1.00	2.53	11.21
Mass (M⊕)	1.00	5.60	317.83
Density (g/cm³)	5.51	1.90	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5.600 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 142276270

Gaia DR2

Gaia DR2 1677343097418015488

Gaia DR3

Gaia DR3 1677343097418015488

System

TOI-1136

Percentile among Sub-Neptune cohort

Radius 2.530 R⊕ · percentile 42 / cohort 1978

Mass 5.600 M⊕ · percentile 17 / cohort 1978

Orbital period 39.55 d · percentile 80 / cohort 1946

Distance 84.54 pc · percentile 18 / cohort 1975

ESI 0.423 · percentile 57 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

39.545 days

Semi-major axis

0.2290 AU

Eccentricity

0.040

Inclination

89.50 °

Year Length

A year here lasts approximately 39.55 Earth days (10.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2290 AU.

Transit Fingerprint

Duration

5.800 h

Impact parameter b

0.310

Rp / R★

0.023900

Transit midpoint (BJD)

2,459,423.6705

Extended Orbital Architecture

Planet / star radius ratio

0.023900

Semi-major axis / stellar radius

50.600

Impact parameter (b)

0.310

RV semi-amplitude (K)

2.200 m/s

Transit mid-time (BJD)

2,459,423.6705

Long. of periastron (ω)

-81.00°

Angular separation (arcsec)

2.71000

Eq. Temperature

574K

(301 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.423

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.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Dai et al. 2022

Instrument

TESS CCD Array

Publication

2022-10

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-1136

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,770 K — cooler than the Sun (5,778 K)

Estimated Age

0.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.968 R☉

Stellar Mass

1.022 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.565 g/cm³

Rotational v·sin i

6.70 km/s

Activity index (log R'HK)

-4.490

Metallicity ratio

[Fe/H]

Distance

84.54 parsec

Light-years 275.72 ly

V-band magnitude

9.53 mag

Voyager-speed travel 4,862,320 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.800 mas

Total Proper Motion

10.214 mas/yr

PM Right Ascension

0.94 mas/yr

PM Declination

-10.17 mas/yr

Galactic Cartesian (pc)

x = -0.415 · y = -0.090 · z = 0.905

Equatorial (J2000)

RA 192.18490° · Dec 64.85528°

Galactic ℓ, b

123.400° · 52.271°

Ecliptic λ, β

146.219° · 60.022°

HTM-20 index

1171597118

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