Key parameters at a glance

A radius of 4.77 Earth radii
A mass of 20.34 Earth masses
Surface gravity around 0.89 g
An orbital period of 40.439 days
Semi-major axis 0.2420 AU
Distance from Earth 377.25 light-years
Earth Similarity Index 0.490
Travel time at Voyager 1 speed 6,652,774 years

HD 144899 b Planet Profile

Physical Specs

Radius

4.77 R⊕

Radius (Jupiter)

0.425 R♃

Mass

20.34 M⊕

Mass (Jupiter)

0.064 M♃

Density

1.03 g/cm³

Surface Gravity

0.89 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.490

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#415of 574

top 72.1%

This planet

4.77R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-502 b 4.77 R⊕ HD 153557 b 4.77 R⊕ Kepler-1527 b 4.77 R⊕

Metric	Earth	HD 144899 b	Jupiter
Radius (R⊕)	1.00	4.77	11.21
Mass (M⊕)	1.00	20.34	317.83
Density (g/cm³)	5.51	1.03	1.33
Surface Gravity (g)	1.00	0.89	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	20.341 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 144899

TIC

TIC 215687919

Gaia DR2

Gaia DR2 5984023937500025344

Gaia DR3

Gaia DR3 5984023937500025344

System

HD 144899

Percentile among Neptune-like cohort

Radius 4.770 R⊕ · percentile 27 / cohort 574

Mass 20.341 M⊕ · percentile 30 / cohort 574

Orbital period 40.44 d · percentile 66 / cohort 524

Distance 115.67 pc · percentile 27 / cohort 572

ESI 0.490 · percentile 89 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

40.439 days

Semi-major axis

0.2420 AU

Eccentricity

0.821

Inclination

— °

Year Length

A year here lasts approximately 40.44 Earth days (11.1% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2420 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.490

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 144899

Spectral Class

F-type yellow-white

Effective Temperature

6,126 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.648 R☉

Stellar Mass

1.160 M☉

Metallicity [Fe/H]

—

Distance

115.67 parsec

Light-years 377.25 ly

V-band magnitude

8.97 mag

Voyager-speed travel 6,652,774 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.617 mas

Total Proper Motion

131.075 mas/yr

PM Right Ascension

-96.33 mas/yr

PM Declination

-88.89 mas/yr

Galactic Cartesian (pc)

x = -0.309 · y = -0.595 · z = -0.742

Equatorial (J2000)

RA 242.57210° · Dec -47.91468°

Galactic ℓ, b

333.718° · 2.711°

Ecliptic λ, β

249.838° · -26.377°

HTM-20 index

2047120968