Key parameters at a glance

A radius of 4.94 Earth radii
A mass of 21.61 Earth masses
Surface gravity around 0.89 g
An orbital period of 50.659 days
Semi-major axis 0.2340 AU
Distance from Earth 131.35 light-years
Earth Similarity Index 0.480
Travel time at Voyager 1 speed 2,316,274 years

HIP 19976 b Planet Profile

Physical Specs

Radius

4.94 R⊕

Radius (Jupiter)

0.441 R♃

Mass

21.61 M⊕

Mass (Jupiter)

0.068 M♃

Density

0.99 g/cm³

Surface Gravity

0.89 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.480

HZ Position Unknown

Controversial No

Discovery

Year 2022

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#390of 574

top 67.8%

This planet

4.94R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

rho CrB d 4.94 R⊕ HD 147379 b 4.94 R⊕ TOI-329 b 4.94 R⊕

Metric	Earth	HIP 19976 b	Jupiter
Radius (R⊕)	1.00	4.94	11.21
Mass (M⊕)	1.00	21.61	317.83
Density (g/cm³)	5.51	0.99	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)	21.612 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 19976

TIC

TIC 7623762

Gaia DR2

Gaia DR2 4840909492463387136

Gaia DR3

Gaia DR3 4840909492463387136

System

HIP 19976

Percentile among Neptune-like cohort

Radius 4.940 R⊕ · percentile 32 / cohort 574

Mass 21.612 M⊕ · percentile 34 / cohort 574

Orbital period 50.66 d · percentile 71 / cohort 524

Distance 40.27 pc · percentile 12 / cohort 572

ESI 0.480 · percentile 86 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

50.659 days

Semi-major axis

0.2340 AU

Eccentricity

0.304

Inclination

— °

Year Length

A year here lasts approximately 50.66 Earth days (13.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2340 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.480

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: HIP 19976

Spectral Class

K-type orange

Effective Temperature

4,316 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.772 R☉

Stellar Mass

0.670 M☉

Metallicity [Fe/H]

—

Distance

40.27 parsec

Light-years 131.35 ly

V-band magnitude

10.48 mag

Voyager-speed travel 2,316,274 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

24.803 mas

Total Proper Motion

257.580 mas/yr

PM Right Ascension

243.88 mas/yr

PM Declination

82.87 mas/yr

Galactic Cartesian (pc)

x = 0.329 · y = 0.682 · z = -0.653

Equatorial (J2000)

RA 64.25979° · Dec -40.79852°

Galactic ℓ, b

244.686° · -45.911°

Ecliptic λ, β

48.042° · -60.543°

HTM-20 index

-1369460593

Similar Worlds

Kepler-257 d

Neptune-like · K-type orange

Radius 4.95 R⊕ · 2,544.9 ly

TOI-1272 c

Neptune-like · K-type orange

Radius 4.95 R⊕ · 448.7 ly

TOI-880 c

Neptune-like · K-type orange

Radius 4.95 R⊕ · 197.9 ly

Kepler-229 c

Neptune-like · K-type orange

Radius 4.92 R⊕ · 2,694.9 ly

Kepler-1321 b

Neptune-like · K-type orange

Radius 4.92 R⊕ · 2,508.6 ly

TOI-544 c

Neptune-like · K-type orange

Radius 4.92 R⊕ · 134.1 ly

Explore Related Categories

Neptune-like Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts