Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 169.00 Earth masses
Surface gravity around 0.84 g
An orbital period of 2,164.000 days
Semi-major axis 3.4800 AU
Distance from Earth 188.46 light-years
Earth Similarity Index 0.258
Travel time at Voyager 1 speed 3,323,408 years

HD 94771 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.270 R♃

Mass

169.00 M⊕

Mass (Jupiter)

0.530 M♃

Density

0.32 g/cm³

Surface Gravity

0.84 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.258

HZ Position Outer

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	HD 94771 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	169.00	317.83
Density (g/cm³)	5.51	0.32	1.33
Surface Gravity (g)	1.00	0.84	2.53
Insolation (S⊕)	1.00	0.27	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	169.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 94771

HIP

HIP 53437

TIC

TIC 48974071

Gaia DR2

Gaia DR2 5401358469249455104

Gaia DR3

Gaia DR3 5401358469249455104

System

HD 94771

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 169.000 M⊕ · percentile 15 / cohort 1747

Orbital period 2,164.00 d · percentile 86 / cohort 1533

Distance 57.78 pc · percentile 24 / cohort 1759

ESI 0.258 · percentile 47 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,164.000 days

Semi-major axis

3.4800 AU

Eccentricity

0.390

Inclination

— °

Year Length

A year here lasts about 5.92 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.4800 AU.

Eq. Temperature

—

Insolation (S⊕)

0.27

Earth = 1.00

Earth Similarity (ESI)

0.258

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Frensch et al. 2023

Instrument

HARPS Spectrograph

Publication

2023-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at La Silla Observatory (12 shown).

GJ 367 c · Super-Earth GJ 367 d · Sub-Neptune TOI-544 c · Neptune-like HD 74698 b · Neptune-like HD 75302 b · Gas Giant BD-210397 c · Gas Giant HD 108202 b · Gas Giant HIP 54597 b · Gas Giant HD 135625 b · Gas Giant HD 185283 b · Gas Giant HD 73256 c · Gas Giant BD-210397 b · Gas Giant

Host System: HD 94771

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,631 K — cooler than the Sun (5,778 K)

Estimated Age

5.73 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.903 R☉

Stellar Mass

1.200 M☉

Metallicity [Fe/H]

0.22

Extended Stellar Properties

Surface gravity (log g)

3.940 dex

Stellar density

0.196 g/cm³

Rotational v·sin i

3.20 km/s

Rotation period

49.00 days

Activity index (log R'HK)

-5.200

Metallicity ratio

[Fe/H]

Distance

57.78 parsec

Light-years 188.46 ly

V-band magnitude

7.37 mag

Voyager-speed travel 3,323,408 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.278 mas

Total Proper Motion

48.356 mas/yr

PM Right Ascension

-26.03 mas/yr

PM Declination

-40.75 mas/yr

Galactic Cartesian (pc)

x = -0.786 · y = 0.226 · z = -0.575

Equatorial (J2000)

RA 163.97468° · Dec -35.11452°

Galactic ℓ, b

277.701° · 22.034°

Ecliptic λ, β

181.571° · -38.139°

HTM-20 index

252562503