Key parameters at a glance

A radius of 12.60 Earth radii
A mass of 2,424.40 Earth masses
Surface gravity around 15.27 g
An orbital period of 58.112 days
Semi-major axis 0.2920 AU
Distance from Earth 129.24 light-years
Earth Similarity Index 0.420
Travel time at Voyager 1 speed 2,279,106 years

Context from the literature

HD 168443 b is a planet with a minimum mass seven times as that of Jupiter. Given the high mass, this planet is likely to be a gas giant, or possibly a small brown dwarf depending on the orbital inclination. It orbits closer to its star than Mercury does to the Sun, and its surface temperature is likely to be very high. It was discovered in 1999 using radial velocity measurements taken at the W. M. Keck Observatory in Hawaii.

Excerpted from Wikipedia · full article

1 sibling around HD 168443

HD 168443 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 168443 b this	Gas Giant	12.60	2,424.40	58.112	—	1998
HD 168443 c	Gas Giant	12.20	5,500.34	1,753.110	—	2000

HD 168443 b Planet Profile

Physical Specs

Radius

12.60 R⊕

Radius (Jupiter)

1.130 R♃

Mass

2,424.40 M⊕

Mass (Jupiter)

7.628 M♃

Density

6.66 g/cm³

Surface Gravity

15.27 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.420

HZ Position Unknown

Controversial No

Discovery

Year 1998

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#1179of 1771

top 66.5%

This planet

12.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

Kepler-419 c 12.60 R⊕ 2MASS J04414489+2301513 b 12.60 R⊕ HD 47536 b 12.60 R⊕

Metric	Earth	HD 168443 b	Jupiter
Radius (R⊕)	1.00	12.60	11.21
Mass (M⊕)	1.00	2,424.40	317.83
Density (g/cm³)	5.51	6.66	1.33
Surface Gravity (g)	1.00	15.27	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	2,424.395 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 168443

HIP

HIP 89844

TIC

TIC 16465196

Gaia DR2

Gaia DR2 4157584215800708736

Gaia DR3

Gaia DR3 4157584215800708736

System

HD 168443

Percentile among Gas Giant cohort

Radius 12.600 R⊕ · percentile 31 / cohort 1771

Mass 2,424.395 M⊕ · percentile 82 / cohort 1747

Orbital period 58.11 d · percentile 51 / cohort 1533

Distance 39.62 pc · percentile 13 / cohort 1759

ESI 0.420 · percentile 91 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

58.112 days

Semi-major axis

0.2920 AU

Eccentricity

0.530

Inclination

92.00 °

Year Length

A year here lasts approximately 58.11 Earth days (15.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2920 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

475.836 m/s

Transit mid-time (BJD)

2,455,272.9570

Long. of periastron (ω)

172.99°

Angular separation (arcsec)

7.37000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.420

0 = alien, 1 = Earth-identical

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Marcy et al. 1999

Instrument

HIRES Spectrometer

Publication

1999-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 1998 at W. M. Keck Observatory (2 shown).

HD 210277 b · Gas Giant HD 187123 b · Gas Giant

Host System: HD 168443

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,491 K — cooler than the Sun (5,778 K)

Estimated Age

11.08 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.711 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

3.988 dex

Stellar density

0.292 g/cm³

Systemic radial velocity

-0.05 km/s

Rotational v·sin i

2.20 km/s

Activity index (log R'HK)

-5.120

Metallicity ratio

[Fe/H]

Distance

39.62 parsec

Light-years 129.24 ly

V-band magnitude

6.92 mag

Voyager-speed travel 2,279,106 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

25.208 mas

Total Proper Motion

242.301 mas/yr

PM Right Ascension

-91.69 mas/yr

PM Declination

-224.29 mas/yr

Galactic Cartesian (pc)

x = 0.086 · y = -0.982 · z = -0.167

Equatorial (J2000)

RA 275.01599° · Dec -9.59669°

Galactic ℓ, b

20.814° · 2.507°

Ecliptic λ, β

275.088° · 13.754°

HTM-20 index

1451828655

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes

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