Key parameters at a glance

A radius of 12.00 Earth radii
A mass of 8,352.53 Earth masses
Surface gravity around 58.00 g
Semi-major axis 431.1600 AU
Equilibrium temperature 2,395 K (2122 °C)
Distance from Earth 384.23 light-years
Earth Similarity Index 0.043
Travel time at Voyager 1 speed 6,775,977 years

brightness_6

Circumbinary planet

HD 284149 AB b orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.

HD 284149 AB b Planet Profile

Physical Specs

Radius

12.00 R⊕

Radius (Jupiter)

1.070 R♃

Mass

8,352.53 M⊕

Mass (Jupiter)

26.280 M♃

Density

26.60 g/cm³

Surface Gravity

58.00 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.043

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Imaging

Facility Paranal Observatory

Telescope 8.2 m ESO VLT UT3 Melipal Telescope

Size rank in cohort

Rank by radius

#1494of 1771

top 84.3%

This planet

12.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 80913 b 12.00 R⊕ HIP 78530 b 12.00 R⊕ HD 221420 b 12.00 R⊕

Metric	Earth	HD 284149 AB b	Jupiter
Radius (R⊕)	1.00	12.00	11.21
Mass (M⊕)	1.00	8,352.53	317.83
Density (g/cm³)	5.51	26.60	1.33
Surface Gravity (g)	1.00	58.00	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8,352.531 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 284149 A

HIP

HIP 19176

TIC

TIC 15817487

Gaia DR2

Gaia DR2 51914888911355776

Gaia DR3

Gaia DR3 51914888911355776

System

HD 284149

Percentile among Gas Giant cohort

Radius 12.000 R⊕ · percentile 15 / cohort 1771

Mass 8,352.531 M⊕ · percentile 99 / cohort 1747

Distance 117.81 pc · percentile 38 / cohort 1759

ESI 0.043 · percentile 2 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

— days

Semi-major axis

431.1600 AU

Eccentricity

—

Inclination

— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

2,395K

(2122 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.043

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Detection Signatures

Astrometry

Positional wobble of the host star was measured.

Direct imaging

The planet has been imaged directly (rare).

Discovery Paper

Primary reference

Bonavita et al. 2017

Instrument

SPHERE

Publication

2017-12

Observation locale

Ground

Host System: HD 284149 A

Spectral Class

F-type yellow-white

Effective Temperature

6,035 K — hotter than the Sun (5,778 K)

Estimated Age

0.03 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.360 R☉

Stellar Mass

1.130 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.307 dex

Stellar density

0.842 g/cm³

Rotational v·sin i

27.00 km/s

Rotation period

1.05 days

Distance

117.81 parsec

Light-years 384.23 ly

V-band magnitude

9.57 mag

Voyager-speed travel 6,775,977 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.460 mas

Total Proper Motion

16.047 mas/yr

PM Right Ascension

6.55 mas/yr

PM Declination

-14.65 mas/yr

Galactic Cartesian (pc)

x = 0.445 · y = 0.825 · z = 0.347

Equatorial (J2000)

RA 61.66169° · Dec 20.30303°

Galactic ℓ, b

173.011° · -23.052°

Ecliptic λ, β

63.560° · -0.573°

HTM-20 index

-450144898