Key parameters at a glance

A radius of 9.58 Earth radii
A mass of 66.60 Earth masses
Surface gravity around 0.73 g
An orbital period of 158.991 days
Semi-major axis 0.5330 AU
Distance from Earth 100.08 light-years
Earth Similarity Index 0.315
Travel time at Voyager 1 speed 1,764,997 years

HD 8326 b Planet Profile

Physical Specs

Radius

9.58 R⊕

Radius (Jupiter)

0.855 R♃

Mass

66.60 M⊕

Mass (Jupiter)

0.210 M♃

Density

0.42 g/cm³

Surface Gravity

0.73 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.315

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Radial Velocity

Facility Las Campanas Observatory

Telescope 6.5 m Magellan II Clay Telescope

Size rank in cohort

Rank by radius

#38of 574

top 6.4%

This planet

9.58R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-6894 b 9.58 R⊕ TOI-1227 b 9.57 R⊕ HD 107148 b 9.60 R⊕

Metric	Earth	HD 8326 b	Jupiter
Radius (R⊕)	1.00	9.58	11.21
Mass (M⊕)	1.00	66.60	317.83
Density (g/cm³)	5.51	0.42	1.33
Surface Gravity (g)	1.00	0.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	66.600 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 8326

HIP

HIP 6390

TIC

TIC 11613065

Gaia DR2

Gaia DR2 5036553052456200320

Gaia DR3

Gaia DR3 5036553052456200320

System

HD 8326

Percentile among Neptune-like cohort

Radius 9.580 R⊕ · percentile 93 / cohort 574

Mass 66.600 M⊕ · percentile 83 / cohort 574

Orbital period 158.99 d · percentile 87 / cohort 524

Distance 30.69 pc · percentile 9 / cohort 572

ESI 0.315 · percentile 54 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

158.991 days

Semi-major axis

0.5330 AU

Eccentricity

0.200

Inclination

— °

Year Length

A year here lasts approximately 158.99 Earth days (43.5% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.5330 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.315

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Feng et al. 2019

Instrument

Carnegie Planet Finder Spectrograph

Publication

2019-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2019 at Las Campanas Observatory (12 shown).

HD 39855 b · Sub-Neptune HIP 54373 b · Sub-Neptune HD 103949 b · Sub-Neptune HD 24085 b · Sub-Neptune HIP 54373 c · Sub-Neptune HIP 35173 b · Sub-Neptune HD 211970 b · Sub-Neptune HD 64114 b · Neptune-like HIP 71135 b · Neptune-like HD 206255 b · Neptune-like HD 21411 b · Neptune-like HD 102843 b · Gas Giant

Host System: HD 8326

Spectral Class

K-type orange

Effective Temperature

4,914 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.783 R☉

Stellar Mass

0.800 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

2.320 g/cm³

Systemic radial velocity

20.86 km/s

Rotational v·sin i

4.00 km/s

Metallicity ratio

[M/H]

Distance

30.69 parsec

Light-years 100.08 ly

V-band magnitude

8.76 mag

Voyager-speed travel 1,764,997 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

32.559 mas

Total Proper Motion

232.364 mas/yr

PM Right Ascension

-58.47 mas/yr

PM Declination

-224.89 mas/yr

Galactic Cartesian (pc)

x = 0.835 · y = 0.313 · z = -0.452

Equatorial (J2000)

RA 20.53144° · Dec -26.89407°

Galactic ℓ, b

212.717° · -83.162°

Ecliptic λ, β

7.300° · -32.645°

HTM-20 index

1342701566

Similar Worlds

WASP-144 b

Neptune-like · K-type orange

Radius 9.53 R⊕ · 1,159.5 ly

HAT-P-20 b

Neptune-like · K-type orange

Radius 9.72 R⊕ · 231.7 ly

TOI-4600 c

Neptune-like · K-type orange

Radius 9.42 R⊕ · 704.7 ly

TOI-5573 b

Neptune-like · K-type orange

Radius 9.75 R⊕ · 608.5 ly

V1298 Tau b

Neptune-like · K-type orange

Radius 9.41 R⊕ · 352.9 ly

Kepler-56 c

Neptune-like · K-type orange

Radius 9.80 R⊕ · 2,977.8 ly

Explore Related Categories

Neptune-like Planets Radial Velocity Discoveries Las Campanas Observatory Mission K-type orange Hosts