Key parameters at a glance

A radius of 4.94 Earth radii
A mass of 21.60 Earth masses
Surface gravity around 0.89 g
An orbital period of 86.580 days
Semi-major axis 0.3193 AU
Distance from Earth 35.11 light-years
Earth Similarity Index 0.480
Travel time at Voyager 1 speed 619,137 years

HD 147379 b Planet Profile

Physical Specs

Radius

4.94 R⊕

Radius (Jupiter)

0.440 R♃

Mass

21.60 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 2017

Method Radial Velocity

Facility Calar Alto Observatory

Telescope 3.5 m telescope

Size rank in cohort

Rank by radius

#390of 574

top 67.8%

This planet

4.94R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HIP 19976 b 4.94 R⊕ rho CrB d 4.94 R⊕ TOI-329 b 4.94 R⊕

Metric	Earth	HD 147379 b	Jupiter
Radius (R⊕)	1.00	4.94	11.21
Mass (M⊕)	1.00	21.60	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)	21.600 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 147379

HIP

HIP 79755

TIC

TIC 230073581

Gaia DR2

Gaia DR2 1642641410934267008

Gaia DR3

Gaia DR3 1642641410934267008

System

HD 147379

Percentile among Neptune-like cohort

Radius 4.940 R⊕ · percentile 32 / cohort 574

Mass 21.600 M⊕ · percentile 34 / cohort 574

Orbital period 86.58 d · percentile 79 / cohort 524

Distance 10.76 pc · percentile 2 / cohort 572

ESI 0.480 · percentile 86 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

86.580 days

Semi-major axis

0.3193 AU

Eccentricity

0.063

Inclination

— °

Year Length

A year here lasts approximately 86.58 Earth days (23.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3193 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

4.490 m/s

Transit mid-time (BJD)

2,458,589.9000

Long. of periastron (ω)

130.10°

Angular separation (arcsec)

29.70000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.480

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Reiners et al. 2018

Instrument

CARMENES

Publication

2018-02

Observation locale

Ground

Host System: HD 147379

Spectral Class

M-type red dwarf

Effective Temperature

4,090 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.628 R☉

Stellar Mass

0.580 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.609 dex

Stellar density

3.216 g/cm³

Systemic radial velocity

-19.86 km/s

Rotational v·sin i

2.70 km/s

Rotation period

28.80 days

Activity index (log R'HK)

-4.750

Metallicity ratio

[Fe/H]

Distance

10.76 parsec

Light-years 35.11 ly

V-band magnitude

8.61 mag

Voyager-speed travel 619,137 yr

Multi-band Host Photometry — 8 bands

Astrometric Data

Parallax

92.870 mas

Total Proper Motion

505.071 mas/yr

PM Right Ascension

-498.02 mas/yr

PM Declination

84.11 mas/yr

Galactic Cartesian (pc)

x = -0.169 · y = -0.348 · z = 0.922

Equatorial (J2000)

RA 244.17257° · Dec 67.23920°

Galactic ℓ, b

99.902° · 39.472°

Ecliptic λ, β

164.321° · 79.918°

HTM-20 index

-1377801197

Observation Record

Photometric series

Stellar spectra

Archive notes