Key parameters at a glance

A radius of 11.10 Earth radii
A mass of 85.81 Earth masses
Surface gravity around 0.70 g
An orbital period of 6.404 days
Semi-major axis 0.0700 AU
Equilibrium temperature 900 K (627 °C)
Distance from Earth 135.58 light-years
Earth Similarity Index 0.142
Travel time at Voyager 1 speed 2,390,898 years

HD 168746 b Planet Profile

Physical Specs

Radius

11.10 R⊕

Radius (Jupiter)

0.993 R♃

Mass

85.81 M⊕

Mass (Jupiter)

0.270 M♃

Density

0.35 g/cm³

Surface Gravity

0.70 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.142

HZ Position Unknown

Controversial No

Discovery

Year 2002

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#1649of 1771

top 93.1%

This planet

11.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 109749 b 11.10 R⊕ MOA-2010-BLG-353L b 11.10 R⊕ TOI-1288 c 11.10 R⊕

Metric	Earth	HD 168746 b	Jupiter
Radius (R⊕)	1.00	11.10	11.21
Mass (M⊕)	1.00	85.81	317.83
Density (g/cm³)	5.51	0.35	1.33
Surface Gravity (g)	1.00	0.70	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	85.814 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 168746

HIP

HIP 90004

TIC

TIC 18097734

Gaia DR2

Gaia DR2 4153637759337630720

Gaia DR3

Gaia DR3 4153637759337630720

System

HD 168746

Percentile among Gas Giant cohort

Radius 11.100 R⊕ · percentile 7 / cohort 1771

Mass 85.814 M⊕ · percentile 4 / cohort 1747

Orbital period 6.40 d · percentile 40 / cohort 1533

Distance 41.57 pc · percentile 15 / cohort 1759

ESI 0.142 · percentile 35 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

6.404 days

Semi-major axis

0.0700 AU

Eccentricity

0.110

Inclination

— °

Year Length

A year here lasts approximately 6.40 Earth days (1.8% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.0700 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

28.600 m/s

Transit mid-time (BJD)

2,454,986.8800

Long. of periastron (ω)

62.50°

Angular separation (arcsec)

1.68000

Eq. Temperature

900K

(627 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.142

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Pepe et al. 2002

Instrument

CORALIE Spectrograph

Publication

2002-06

Observation locale

Ground

Discovery cohort

Planets confirmed in 2002 at La Silla Observatory (4 shown).

HD 47536 b · Gas Giant HD 141937 b · Gas Giant HD 162020 b · Gas Giant HD 108147 b · Gas Giant

Host System: HD 168746

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,570 K — cooler than the Sun (5,778 K)

Estimated Age

8.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.090 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

1.090 g/cm³

Systemic radial velocity

-25.56 km/s

Rotational v·sin i

1.00 km/s

Activity index (log R'HK)

-5.050

Metallicity ratio

[Fe/H]

Distance

41.57 parsec

Light-years 135.58 ly

V-band magnitude

7.95 mag

Voyager-speed travel 2,390,898 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

24.028 mas

Total Proper Motion

72.099 mas/yr

PM Right Ascension

-23.10 mas/yr

PM Declination

-68.30 mas/yr

Galactic Cartesian (pc)

x = 0.093 · y = -0.974 · z = -0.207

Equatorial (J2000)

RA 275.45733° · Dec -11.92298°

Galactic ℓ, b

18.964° · 1.030°

Ecliptic λ, β

275.443° · 11.413°

HTM-20 index

28175089

Observation Record

Photometric series

RV measurements

Archive notes