Key parameters at a glance

A radius of 2.02 Earth radii
A mass of 4.72 Earth masses
Surface gravity around 1.16 g
An orbital period of 29.541 days
Semi-major axis 0.1758 AU
Distance from Earth 210.69 light-years
Earth Similarity Index 0.782
Travel time at Voyager 1 speed 3,715,511 years

4 siblings around HD 108236

HD 108236 f 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	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 this	Sub-Neptune	2.02	4.72	29.541	—	2021

HD 108236 f Planet Profile

Physical Specs

Radius

2.02 R⊕

Radius (Jupiter)

0.180 R♃

Mass

4.72 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.16 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.782

HZ Position Unknown

Controversial No

Discovery

Year 2021

Method Transit

Facility CHaracterising ExOPlanets Satellite (CHEOPS)

Telescope 0.3 m Ritchey-Chretien Telescope

Size rank in cohort

Rank by radius

#1939of 1978

top 98.0%

This planet

2.02R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-544 b 2.02 R⊕ pi Men c 2.02 R⊕ Kepler-343 c 2.02 R⊕

Metric	Earth	HD 108236 f	Jupiter
Radius (R⊕)	1.00	2.02	11.21
Mass (M⊕)	1.00	4.72	317.83
Density (g/cm³)	5.51	3.16	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	—	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 Sub-Neptune cohort

Radius 2.017 R⊕ · percentile 2 / cohort 1978

Mass 4.720 M⊕ · percentile 4 / cohort 1978

Orbital period 29.54 d · percentile 73 / cohort 1946

Distance 64.60 pc · percentile 14 / cohort 1975

ESI 0.782 · percentile 99 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

29.541 days

Semi-major axis

0.1758 AU

Eccentricity

0.051

Inclination

88.96 °

Year Length

A year here lasts approximately 29.54 Earth days (8.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1758 AU.

Transit Fingerprint

Depth

0.045 %

Duration

3.270 h

Impact parameter b

0.808

Transit midpoint (BJD)

2,458,793.2786

Photometric dip

Transit produces a flux drop of 445 ppm lasting ≈ 3.27 h.

Extended Orbital Architecture

Impact parameter (b)

0.808

Transit mid-time (BJD)

2,458,793.2786

Long. of periastron (ω)

275.00°

Angular separation (arcsec)

2.72000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.782

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Bonfanti et al. 2021

Instrument

Teledyne e2v CCD detector

Publication

2021-02

Observation locale

Space

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