Key parameters at a glance

A radius of 1.62 Earth radii
A mass of 3.24 Earth masses
Surface gravity around 1.24 g
An orbital period of 3.796 days
Semi-major axis 0.0453 AU
Equilibrium temperature 1,099 K (826 °C)
Distance from Earth 210.69 light-years
Earth Similarity Index 0.263
Travel time at Voyager 1 speed 3,715,511 years

4 siblings around HD 108236

HD 108236 b shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 108236 b this	Super-Earth	1.62	3.24	3.796	1,099	2020
HD 108236 c	Sub-Neptune	2.07	4.94	6.203	932	2020
TOI-1233.01	Sub-Neptune	2.54	6.98	14.176	708	2021
HD 108236 e	Sub-Neptune	3.08	9.71	19.590	636	2020
HD 108236 f	Sub-Neptune	2.02	4.72	29.541	—	2021

HD 108236 b Planet Profile

Physical Specs

Radius

1.62 R⊕

Radius (Jupiter)

0.144 R♃

Mass

3.24 M⊕

Mass (Jupiter)

0.010 M♃

Density

4.23 g/cm³

Surface Gravity

1.24 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.263

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#547of 1176

top 46.4%

This planet

1.62R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1749 b 1.61 R⊕ HD 80653 b 1.61 R⊕ Kepler-1961 b 1.62 R⊕

Metric	Earth	HD 108236 b	Jupiter
Radius (R⊕)	1.00	1.62	11.21
Mass (M⊕)	1.00	3.24	317.83
Density (g/cm³)	5.51	4.23	1.33
Surface Gravity (g)	1.00	1.24	2.53
Insolation (S⊕)	1.00	312.18	0.037

Star Catalogue Identifiers

HD 108236

HIP

HIP 60689

TIC

TIC 260647166

Gaia DR2

Gaia DR2 6125644402384918784

Gaia DR3

Gaia DR3 6125644402384918784

System

HD 108236

Percentile among Super-Earth cohort

Radius 1.615 R⊕ · percentile 53 / cohort 1176

Mass 3.240 M⊕ · percentile 48 / cohort 1176

Orbital period 3.80 d · percentile 30 / cohort 1164

Distance 64.60 pc · percentile 13 / cohort 1171

ESI 0.263 · percentile 27 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

3.796 days

Semi-major axis

0.0453 AU

Eccentricity

0.045

Inclination

87.59 °

Year Length

A year here lasts approximately 3.80 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0453 AU.

Transit Fingerprint

Depth

0.029 %

Duration

2.384 h

Impact parameter b

0.452

Rp / R★

0.016380

Transit midpoint (BJD)

2,458,773.2964

Photometric dip

Transit produces a flux drop of 285 ppm lasting ≈ 2.38 h.

Extended Orbital Architecture

Planet / star radius ratio

0.016380

Semi-major axis / stellar radius

11.350

Impact parameter (b)

0.452

Transit mid-time (BJD)

2,458,773.2964

Long. of periastron (ω)

126.00°

Angular separation (arcsec)

0.70100

Eq. Temperature

1,099K

(826 °C)

Insolation (S⊕)

312.18

Earth = 1.00

Earth Similarity (ESI)

0.263

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Daylan et al. 2021

Instrument

TESS CCD Array

Publication

2021-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-700 d · Rocky Terrestrial TOI-237 b · Super-Earth TOI-700 b · Rocky Terrestrial TOI-1266 c · Super-Earth LTT 3780 c · Sub-Neptune TOI-700 c · Sub-Neptune TOI-776 c · Sub-Neptune TOI-942 c · Neptune-like TOI-776 b · Super-Earth TOI-1266 b · Sub-Neptune TOI-540 b · Rocky Terrestrial LHS 1815 b · Rocky Terrestrial

Host System: HD 108236

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,660 K — cooler than the Sun (5,778 K)

Estimated Age

6.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.877 R☉

Stellar Mass

0.869 M☉

Metallicity [Fe/H]

-0.28

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.820 g/cm³

Systemic radial velocity

16.30 km/s

Rotational v·sin i

4.70 km/s

Metallicity ratio

[Fe/H]

Distance

64.60 parsec

Light-years 210.69 ly

V-band magnitude

9.25 mag

Voyager-speed travel 3,715,511 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

15.452 mas

Total Proper Motion

86.299 mas/yr

PM Right Ascension

-70.43 mas/yr

PM Declination

-49.87 mas/yr

Galactic Cartesian (pc)

x = -0.620 · y = -0.071 · z = -0.781

Equatorial (J2000)

RA 186.57406° · Dec -51.36305°

Galactic ℓ, b

298.934° · 11.313°

Ecliptic λ, β

211.240° · -43.490°

HTM-20 index

-10948854