Confirmed Exoplanet Discovered 2017

HIP 65426 b

A gas giant orbiting the a-type white HIP 65426, located approximately 355.1 light-years from Earth.

Key parameters at a glance

  • A radius of 16.81 Earth radii
  • A mass of 2,860.47 Earth masses
  • Surface gravity around 10.12 g
  • Semi-major axis 92.0000 AU
  • Equilibrium temperature 1,500 K (1227 °C)
  • Distance from Earth 355.10 light-years
  • Earth Similarity Index 0.099
  • Travel time at Voyager 1 speed 6,262,230 years

HIP 65426 b Planet Profile

Physical Specs

Radius
16.81 R⊕
Radius (Jupiter)
1.500 R♃
Mass
2,860.47 M⊕
Mass (Jupiter)
9.000 M♃
Density
3.31 g/cm³
Surface Gravity
10.12 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.099
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

#116of 1771

top 6.5%

This planet

16.81R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

WASP-48 b 16.81 R⊕ HATS-27 b 16.81 R⊕ WASP-168 b 16.81 R⊕
Metric Earth HIP 65426 b Jupiter
Radius (R⊕)1.0016.8111.21
Mass (M⊕)1.002,860.47317.83
Density (g/cm³)5.513.311.33
Surface Gravity (g)1.0010.122.53
Insolation (S⊕)1.00—0.037

Alternative Mass Estimates

Method Value Interpretation
Best measured mass 2,860.470 M⊕ Direct mass measurement (not derived).

Star Catalogue Identifiers

HD

HD 116434

HIP

HIP 65426

TIC

TIC 438702139

Gaia DR2

Gaia DR2 6070080754075553792

Gaia DR3

Gaia DR3 6070080754075553792

System

HIP 65426

Percentile among Gas Giant cohort

Radius 16.814 R⊕ · percentile 93 / cohort 1771
Mass 2,860.470 M⊕ · percentile 86 / cohort 1747
Distance 108.88 pc · percentile 36 / cohort 1759
ESI 0.099 · percentile 26 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period
— days
Semi-major axis
92.0000 AU
Eccentricity
—
Inclination
— °

Year Length

Orbital period for this planet has not yet been measured.

Eq. Temperature

1,500K

(1227 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.099

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched.

Discovery Paper

Primary reference

Chauvin et al. 2017

Instrument

Multiple Instruments

Publication

2017-09

Observation locale

Ground

Host System: HIP 65426

Spectral Class

A-type white

Effective Temperature

8,840 K — hotter than the Sun (5,778 K)

Estimated Age

0.01 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.770 R☉

Stellar Mass

1.960 M☉

Metallicity [Fe/H]

—

Extended Stellar Properties

Surface gravity (log g)

4.321 dex

Stellar density

0.621 g/cm³

Systemic radial velocity

-5.20 km/s

Rotational v·sin i

299.00 km/s

Distance
108.88 parsec
Light-years 355.10 ly
V-band magnitude
7.01 mag
Voyager-speed travel 6,262,230 yr

Multi-band Host Photometry — 11 bands

6.67.17.08B7.01V6.98Gaia6.95TESS6.83J6.85H6.77K6.77W16.79W26.78W36.60W4

Astrometric Data

Parallax

9.157 mas

Total Proper Motion

39.072 mas/yr

PM Right Ascension

-34.25 mas/yr

PM Declination

-18.81 mas/yr

Galactic Cartesian (pc)

x = -0.581 · y = -0.225 · z = -0.783

Equatorial (J2000)

RA 201.15017° · Dec -51.50454°

Galactic ℓ, b

308.179° · 11.029°

Ecliptic λ, β

221.705° · -38.957°

HTM-20 index

37120267

Similar Worlds

TOI-1431 b

Gas Giant · A-type white

Radius 16.70 R⊕ · 485.7 ly

KOI-13 b

Gas Giant · A-type white

Radius 16.95 R⊕ · 1,693.1 ly

MASCARA-4 b

Gas Giant · A-type white

Radius 16.98 R⊕ · 556.7 ly

KELT-17 b

Gas Giant · A-type white

Radius 17.09 R⊕ · 738.7 ly

HD 135344 A b

Gas Giant · A-type white

Radius 16.25 R⊕ · 461.8 ly

KELT-21 b

Gas Giant · A-type white

Radius 17.78 R⊕ · 1,535.8 ly

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