Key parameters at a glance

A radius of 8.18 Earth radii
A mass of 50.85 Earth masses
Surface gravity around 0.76 g
An orbital period of 142.229 days
Semi-major axis 0.5340 AU
Distance from Earth 141.76 light-years
Earth Similarity Index 0.349
Travel time at Voyager 1 speed 2,500,003 years

HD 13724 c Planet Profile

Physical Specs

Radius

8.18 R⊕

Radius (Jupiter)

0.729 R♃

Mass

50.85 M⊕

Mass (Jupiter)

0.160 M♃

Density

0.51 g/cm³

Surface Gravity

0.76 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.349

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#144of 574

top 24.9%

This planet

8.18R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

KMT-2024-BLG-2005L b 8.18 R⊕ K2-281 b 8.18 R⊕ Kepler-108 c 8.18 R⊕

Metric	Earth	HD 13724 c	Jupiter
Radius (R⊕)	1.00	8.18	11.21
Mass (M⊕)	1.00	50.85	317.83
Density (g/cm³)	5.51	0.51	1.33
Surface Gravity (g)	1.00	0.76	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	50.853 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 13724

TIC

TIC 7244844

Gaia DR2

Gaia DR2 4942867480584948352

Gaia DR3

Gaia DR3 4942867480584948352

System

HD 13724

Percentile among Neptune-like cohort

Radius 8.180 R⊕ · percentile 74 / cohort 574

Mass 50.853 M⊕ · percentile 70 / cohort 574

Orbital period 142.23 d · percentile 86 / cohort 524

Distance 43.47 pc · percentile 13 / cohort 572

ESI 0.349 · percentile 63 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

142.229 days

Semi-major axis

0.5340 AU

Eccentricity

0.651

Inclination

— °

Year Length

A year here lasts approximately 142.23 Earth days (38.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.5340 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.349

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2022

Instrument

Multiple Instruments

Publication

2022-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2022 at Multiple Observatories (12 shown).

Kepler-138 e · Rocky Terrestrial HD 93351 b · Super-Earth GJ 1002 b · Rocky Terrestrial GJ 2030 b · Sub-Neptune GJ 3929 c · Sub-Neptune HD 217786 c · Sub-Neptune GJ 1002 c · Rocky Terrestrial HD 155918 b · Sub-Neptune HD 213519 b · Sub-Neptune HD 191939 g · Sub-Neptune GJ 514 b · Sub-Neptune HD 12235 b · Sub-Neptune

Host System: HD 13724

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,835 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.042 R☉

Stellar Mass

1.004 M☉

Metallicity [Fe/H]

0.22

Extended Stellar Properties

Surface gravity (log g)

4.424 dex

Stellar density

1.309 g/cm³

Metallicity ratio

[M/H]

Distance

43.47 parsec

Light-years 141.76 ly

V-band magnitude

7.89 mag

Voyager-speed travel 2,500,003 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

22.978 mas

Total Proper Motion

75.497 mas/yr

PM Right Ascension

-30.71 mas/yr

PM Declination

-68.97 mas/yr

Galactic Cartesian (pc)

x = 0.573 · y = 0.374 · z = -0.729

Equatorial (J2000)

RA 33.08596° · Dec -46.81667°

Galactic ℓ, b

269.335° · -64.686°

Ecliptic λ, β

5.248° · -54.845°

HTM-20 index

-1073341411