Key parameters at a glance

A radius of 1.66 Earth radii
A mass of 4.72 Earth masses
Surface gravity around 1.70 g
An orbital period of 11.578 days
Semi-major axis 0.0964 AU
Equilibrium temperature 905 K (632 °C)
Distance from Earth 47.89 light-years
Earth Similarity Index 0.329
Travel time at Voyager 1 speed 844,474 years

2 siblings around HD 136352

HD 136352 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 136352 b this	Super-Earth	1.66	4.72	11.578	905	2019
HD 136352 c	Sub-Neptune	2.92	11.24	27.592	677	2019
HD 136352 d	Sub-Neptune	2.56	8.82	107.245	431	2019

HD 136352 b Planet Profile

Physical Specs

Radius

1.66 R⊕

Radius (Jupiter)

0.148 R♃

Mass

4.72 M⊕

Mass (Jupiter)

0.015 M♃

Density

5.62 g/cm³

Surface Gravity

1.70 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.329

HZ Position Inner

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#465of 1176

top 39.5%

This planet

1.66R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

TOI-871 b 1.66 R⊕ Kepler-1795 b 1.66 R⊕ K2-227 b 1.67 R⊕

Metric	Earth	HD 136352 b	Jupiter
Radius (R⊕)	1.00	1.66	11.21
Mass (M⊕)	1.00	4.72	317.83
Density (g/cm³)	5.51	5.62	1.33
Surface Gravity (g)	1.00	1.70	2.53
Insolation (S⊕)	1.00	111.60	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4.720 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	4.620 M⊕	Lower bound from radial-velocity fitting.
Computed mass	4.621 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD 136352

HIP

HIP 75181

TIC

TIC 136916387

Gaia DR2

Gaia DR2 5902750168276592256

Gaia DR3

Gaia DR3 5902750168276592256

System

HD 136352

Percentile among Super-Earth cohort

Radius 1.664 R⊕ · percentile 60 / cohort 1176

Mass 4.720 M⊕ · percentile 92 / cohort 1176

Orbital period 11.58 d · percentile 69 / cohort 1164

Distance 14.68 pc · percentile 3 / cohort 1171

ESI 0.329 · percentile 45 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

11.578 days

Semi-major axis

0.0964 AU

Eccentricity

0.000

Inclination

88.49 °

Year Length

A year here lasts approximately 11.58 Earth days (3.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0964 AU.

Transit Fingerprint

Depth

0.021 %

Duration

3.935 h

Impact parameter b

0.520

Rp / R★

0.014420

Transit midpoint (BJD)

2,458,944.3726

Photometric dip

Transit produces a flux drop of 208 ppm lasting ≈ 3.94 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014420

Semi-major axis / stellar radius

19.600

Impact parameter (b)

0.520

RV semi-amplitude (K)

1.460 m/s

Transit mid-time (BJD)

2,458,944.3726

Long. of periastron (ω)

-185.64°

Angular separation (arcsec)

6.57000

Eq. Temperature

905K

(632 °C)

Insolation (S⊕)

111.60

Earth = 1.00

Earth Similarity (ESI)

0.329

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

Udry et al. 2019

Instrument

HARPS Spectrograph

Publication

2019-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at La Silla Observatory (12 shown).

HD 20781 b · Rocky Terrestrial HD 20781 c · Sub-Neptune HD 21693 b · Sub-Neptune HD 45184 c · Sub-Neptune HD 134060 b · Sub-Neptune HD 31527 b · Sub-Neptune HD 20781 d · Sub-Neptune HD 20003 b · Sub-Neptune HD 31527 d · Sub-Neptune HD 45184 b · Sub-Neptune HD 51608 b · Sub-Neptune HD 136352 d · Sub-Neptune

Host System: HD 136352

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,664 K — cooler than the Sun (5,778 K)

Estimated Age

12.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.058 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

-0.24

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.035 g/cm³

Systemic radial velocity

-69.00 km/s

Rotational v·sin i

1.00 km/s

Rotation period

23.80 days

Activity index (log R'HK)

-4.910

Metallicity ratio

[M/H]

Distance

14.68 parsec

Light-years 47.89 ly

V-band magnitude

5.65 mag

Voyager-speed travel 844,474 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

68.082 mas

Total Proper Motion

1,647.340 mas/yr

PM Right Ascension

-1,624.05 mas/yr

PM Declination

-276.02 mas/yr

Galactic Cartesian (pc)

x = -0.424 · y = -0.513 · z = -0.747

Equatorial (J2000)

RA 230.44011° · Dec -48.31882°

Galactic ℓ, b

327.071° · 7.381°

Ecliptic λ, β

241.104° · -28.770°

HTM-20 index

1294898941

Observation Record

Photometric series

RV measurements

Stellar spectra