Key parameters at a glance

A radius of 14.00 Earth radii
A mass of 244.73 Earth masses
Surface gravity around 1.25 g
An orbital period of 674.940 days
Semi-major axis 1.6100 AU
Distance from Earth 153.39 light-years
Earth Similarity Index 0.286
Travel time at Voyager 1 speed 2,704,984 years

HIP 18606 b Planet Profile

Physical Specs

Radius

14.00 R⊕

Radius (Jupiter)

1.250 R♃

Mass

244.73 M⊕

Mass (Jupiter)

0.770 M♃

Density

0.49 g/cm³

Surface Gravity

1.25 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.286

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#415of 1771

top 23.4%

This planet

14.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 9446 b 14.00 R⊕ HD 156411 b 14.00 R⊕ HD 224693 b 14.00 R⊕

Metric	Earth	HIP 18606 b	Jupiter
Radius (R⊕)	1.00	14.00	11.21
Mass (M⊕)	1.00	244.73	317.83
Density (g/cm³)	5.51	0.49	1.33
Surface Gravity (g)	1.00	1.25	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	244.728 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HIP

HIP 18606

TIC

TIC 49952922

Gaia DR2

Gaia DR2 3245123980001812864

Gaia DR3

Gaia DR3 3245123980001812864

System

HIP 18606

Percentile among Gas Giant cohort

Radius 14.000 R⊕ · percentile 74 / cohort 1771

Mass 244.728 M⊕ · percentile 26 / cohort 1747

Orbital period 674.94 d · percentile 72 / cohort 1533

Distance 47.03 pc · percentile 18 / cohort 1759

ESI 0.286 · percentile 54 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

674.940 days

Semi-major axis

1.6100 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts about 1.85 Earth years at a mean orbital distance of 1.6100 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.286

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Jenkins et al. 2025

Instrument

Multiple Instruments

Publication

2025-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at Multiple Observatories (12 shown).

Gl 725 A b · Super-Earth HD 20794 f · Sub-Neptune GJ 3998 d · Sub-Neptune GJ 251 c · Super-Earth HD 86728 b · Sub-Neptune TOI-2015 c · Sub-Neptune Kepler-139 f · Neptune-like HD 73344 d · Gas Giant TOI-1472 c · Sub-Neptune TOI-6695 c · Gas Giant AT2021ueyL b · Gas Giant HIP 111909 b · Gas Giant

Host System: HIP 18606

Spectral Class

K-type orange

Effective Temperature

4,860 K — cooler than the Sun (5,778 K)

Estimated Age

5.29 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

4.830 R☉

Stellar Mass

1.210 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

3.100 dex

Rotational v·sin i

3.04 km/s

Metallicity ratio

[Fe/H]

Distance

47.03 parsec

Light-years 153.39 ly

V-band magnitude

5.83 mag

Voyager-speed travel 2,704,984 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

21.235 mas

Total Proper Motion

180.502 mas/yr

PM Right Ascension

-46.74 mas/yr

PM Declination

-174.35 mas/yr

Galactic Cartesian (pc)

x = 0.502 · y = 0.860 · z = -0.095

Equatorial (J2000)

RA 59.71811° · Dec -5.47070°

Galactic ℓ, b

195.682° · -40.487°

Ecliptic λ, β

56.230° · -25.430°

HTM-20 index

-1931277350

Similar Worlds

HIP 86221 b

Gas Giant · K-type orange

Radius 14.00 R⊕ · 96.2 ly

BD-210397 b

Gas Giant · K-type orange

Radius 14.00 R⊕ · 77.4 ly

BD+55 362 b

Gas Giant · K-type orange

Radius 14.00 R⊕ · 171.5 ly

Qatar-2 b

Gas Giant · K-type orange

Radius 14.06 R⊕ · 591.6 ly

HD 2952 b

Gas Giant · K-type orange

Radius 13.90 R⊕ · 359.1 ly

HIP 111909 c

Gas Giant · K-type orange

Radius 13.90 R⊕ · 287.3 ly

Explore Related Categories

Gas Giant Planets Radial Velocity Discoveries Multiple Observatories Mission K-type orange Hosts