Key parameters at a glance

A radius of 7.59 Earth radii
A mass of 44.80 Earth masses
Surface gravity around 0.78 g
An orbital period of 966.500 days
Semi-major axis 1.9410 AU
Distance from Earth 87.38 light-years
Earth Similarity Index 0.366
Travel time at Voyager 1 speed 1,540,948 years

4 siblings around HD 134606

HD 134606 d shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 134606 e	Super-Earth	1.33	2.34	4.320	—	2024
HD 134606 b	Sub-Neptune	2.97	9.09	12.089	—	2024
HD 134606 f	Sub-Neptune	2.24	5.63	26.915	—	2024
HD 134606 c	Sub-Neptune	3.37	11.31	58.883	—	2024
HD 134606 d this	Neptune-like	7.59	44.80	966.500	—	2024

HD 134606 d Planet Profile

Physical Specs

Radius

7.59 R⊕

Radius (Jupiter)

0.677 R♃

Mass

44.80 M⊕

Mass (Jupiter)

0.141 M♃

Density

0.56 g/cm³

Surface Gravity

0.78 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.366

HZ Position Unknown

Controversial No

Discovery

Year 2024

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#173of 574

top 30.0%

This planet

7.59R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

55 Cnc f 7.59 R⊕ K2-87 b 7.60 R⊕ OGLE-2018-BLG-0298L b 7.56 R⊕

Metric	Earth	HD 134606 d	Jupiter
Radius (R⊕)	1.00	7.59	11.21
Mass (M⊕)	1.00	44.80	317.83
Density (g/cm³)	5.51	0.56	1.33
Surface Gravity (g)	1.00	0.78	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	44.800 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 134606

HIP

HIP 74653

TIC

TIC 262457542

Gaia DR2

Gaia DR2 5798962867668048768

Gaia DR3

Gaia DR3 5798962867668048768

System

HD 134606

Percentile among Neptune-like cohort

Radius 7.590 R⊕ · percentile 70 / cohort 574

Mass 44.800 M⊕ · percentile 67 / cohort 574

Orbital period 966.50 d · percentile 98 / cohort 524

Distance 26.79 pc · percentile 8 / cohort 572

ESI 0.366 · percentile 67 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

966.500 days

Semi-major axis

1.9410 AU

Eccentricity

0.092

Inclination

— °

Year Length

A year here lasts about 2.65 Earth years on a nearly circular orbit at a mean orbital distance of 1.9410 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.366

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Li et al. 2024

Instrument

Multiple Instruments

Publication

2024-01

Observation locale

Ground

Discovery cohort

Planets confirmed in 2024 at Multiple Observatories (12 shown).

HD 134606 e · Super-Earth Kepler-51 e · Sub-Neptune HD 134606 f · Sub-Neptune HD 134606 b · Sub-Neptune Teegarden's Star d · Rocky Terrestrial HD 134606 c · Sub-Neptune HD 104067 c · Sub-Neptune GJ 1289 b · Sub-Neptune TOI-4562 c · Gas Giant HD 222237 b · Gas Giant CI Tau c · Gas Giant HD 75898 c · Gas Giant

Host System: HD 134606

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,576 K — cooler than the Sun (5,778 K)

Estimated Age

7.30 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.158 R☉

Stellar Mass

1.046 M☉

Metallicity [Fe/H]

0.34

Extended Stellar Properties

Surface gravity (log g)

4.330 dex

Stellar density

0.950 g/cm³

Systemic radial velocity

2.30 km/s

Rotational v·sin i

1.30 km/s

Rotation period

42.00 days

Activity index (log R'HK)

-5.100

Metallicity ratio

[Fe/H]

Distance

26.79 parsec

Light-years 87.38 ly

V-band magnitude

6.86 mag

Voyager-speed travel 1,540,948 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

37.297 mas

Total Proper Motion

242.373 mas/yr

PM Right Ascension

-177.75 mas/yr

PM Declination

-164.77 mas/yr

Galactic Cartesian (pc)

x = -0.220 · y = -0.251 · z = -0.943

Equatorial (J2000)

RA 228.81039° · Dec -70.52033°

Galactic ℓ, b

314.434° · -10.931°

Ecliptic λ, β

250.053° · -49.920°

HTM-20 index

-420074960