Key parameters at a glance

A mass of 8,358.89 Earth masses
An orbital period of 1,823.500 days
Semi-major axis 3.6340 AU
Distance from Earth 764.16 light-years
Travel time at Voyager 1 speed 13,476,030 years

brightness_6

Circumbinary planet

BEBOP-4 AB b orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

BEBOP-4 AB b Planet Profile

Physical Specs

Radius

— R⊕

Radius (Jupiter)

— R♃

Mass

8,358.89 M⊕

Mass (Jupiter)

26.300 M♃

Density

— g/cm³

Surface Gravity

— g (Earth)

Classification

Planet Type

Unclassified

ESI Score —

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Metric	Earth	BEBOP-4 AB b	Jupiter
Radius (R⊕)	1.00	—	11.21
Mass (M⊕)	1.00	8,358.89	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	—	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8,358.887 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	6,642.614 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 111605

TIC

TIC 356710041

Gaia DR2

Gaia DR2 3961485079994112896

Gaia DR3

Gaia DR3 3961485079994112896

System

BEBOP-4

Percentile among Unclassified cohort

Mass 8,358.887 M⊕ · percentile 98 / cohort 42

Orbital period 1,823.50 d · percentile 84 / cohort 43

Distance 234.29 pc · percentile 84 / cohort 43

Orbit & Habitability

Orbital Dynamics

Period

1,823.500 days

Semi-major axis

3.6340 AU

Eccentricity

0.428

Inclination

— °

Year Length

A year here lasts about 4.99 Earth years on a highly eccentric trajectory at a mean orbital distance of 3.6340 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

—

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Triaud et al. 2025

Instrument

SOPHIE Spectrograph

Publication

2025-10

Observation locale

Ground

Host System: BEBOP-4 A

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,701 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

2.756 R☉

Stellar Mass

1.507 M☉

Metallicity [Fe/H]

0.26

Extended Stellar Properties

Surface gravity (log g)

3.566 dex

Stellar density

0.069 g/cm³

Systemic radial velocity

5.28 km/s

Metallicity ratio

[M/H]

Distance

234.29 parsec

Light-years 764.16 ly

V-band magnitude

9.65 mag

Voyager-speed travel 13,476,030 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

4.240 mas

Total Proper Motion

12.860 mas/yr

PM Right Ascension

12.58 mas/yr

PM Declination

2.66 mas/yr

Galactic Cartesian (pc)

x = -0.876 · y = -0.195 · z = 0.441

Equatorial (J2000)

RA 192.57727° · Dec 26.15954°

Galactic ℓ, b

288.273° · 88.999°

Ecliptic λ, β

180.255° · 28.832°

HTM-20 index

367798568