Key parameters at a glance

A radius of 13.70 Earth radii
A mass of 359.15 Earth masses
Surface gravity around 1.91 g
An orbital period of 141.630 days
Semi-major axis 0.5670 AU
Distance from Earth 355.11 light-years
Earth Similarity Index 0.319
Travel time at Voyager 1 speed 6,262,345 years

HD 231701 b Planet Profile

Physical Specs

Radius

13.70 R⊕

Radius (Jupiter)

1.220 R♃

Mass

359.15 M⊕

Mass (Jupiter)

1.130 M♃

Density

0.77 g/cm³

Surface Gravity

1.91 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.319

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#554of 1771

top 31.2%

This planet

13.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 148164 b 13.70 R⊕ HD 114783 b 13.70 R⊕ HD 159243 b 13.70 R⊕

Metric	Earth	HD 231701 b	Jupiter
Radius (R⊕)	1.00	13.70	11.21
Mass (M⊕)	1.00	359.15	317.83
Density (g/cm³)	5.51	0.77	1.33
Surface Gravity (g)	1.00	1.91	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	359.148 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 231701

HIP

HIP 96078

TIC

TIC 92300251

Gaia DR2

Gaia DR2 4321678767076043264

Gaia DR3

Gaia DR3 4321678767076043264

System

HD 231701

Percentile among Gas Giant cohort

Radius 13.700 R⊕ · percentile 66 / cohort 1771

Mass 359.148 M⊕ · percentile 39 / cohort 1747

Orbital period 141.63 d · percentile 55 / cohort 1533

Distance 108.88 pc · percentile 36 / cohort 1759

ESI 0.319 · percentile 63 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

141.630 days

Semi-major axis

0.5670 AU

Eccentricity

0.130

Inclination

— °

Year Length

A year here lasts approximately 141.63 Earth days (38.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.5670 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.319

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Fischer et al. 2007

Instrument

HIRES Spectrometer

Publication

2007-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at W. M. Keck Observatory (7 shown).

HD 11506 b · Gas Giant HD 125612 b · Gas Giant HD 75898 b · Gas Giant GJ 317 b · Gas Giant HD 5319 b · Gas Giant HD 170469 b · Gas Giant HD 175541 b · Gas Giant

Host System: HD 231701

Spectral Class

F-type yellow-white

Effective Temperature

6,101 K — hotter than the Sun (5,778 K)

Estimated Age

3.43 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.530 R☉

Stellar Mass

1.210 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.310 dex

Stellar density

0.527 g/cm³

Systemic radial velocity

-63.36 km/s

Rotational v·sin i

4.00 km/s

Rotation period

12.20 days

Metallicity ratio

[Fe/H]

Distance

108.88 parsec

Light-years 355.11 ly

V-band magnitude

8.97 mag

Voyager-speed travel 6,262,345 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

9.156 mas

Total Proper Motion

65.267 mas/yr

PM Right Ascension

63.36 mas/yr

PM Declination

15.65 mas/yr

Galactic Cartesian (pc)

x = 0.375 · y = -0.883 · z = 0.284

Equatorial (J2000)

RA 293.01762° · Dec 16.47436°

Galactic ℓ, b

52.175° · -1.215°

Ecliptic λ, β

298.276° · 37.681°

HTM-20 index

-168565244

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes