Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 740.54 Earth masses
Surface gravity around 4.19 g
An orbital period of 968.800 days
Semi-major axis 1.8640 AU
Distance from Earth 105.82 light-years
Earth Similarity Index 0.378
Travel time at Voyager 1 speed 1,866,211 years

HD 98736 b Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.190 R♃

Mass

740.54 M⊕

Mass (Jupiter)

2.330 M♃

Density

1.73 g/cm³

Surface Gravity

4.19 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.378

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 129445 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	HD 98736 b	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	740.54	317.83
Density (g/cm³)	5.51	1.73	1.33
Surface Gravity (g)	1.00	4.19	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	740.544 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 98736

HIP

HIP 55486 A

TIC

TIC 3819571

Gaia DR2

Gaia DR2 3977050728669174912

Gaia DR3

Gaia DR3 3977050728669174912

System

HD 98736

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 740.544 M⊕ · percentile 59 / cohort 1747

Orbital period 968.80 d · percentile 76 / cohort 1533

Distance 32.45 pc · percentile 9 / cohort 1759

ESI 0.378 · percentile 79 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

968.800 days

Semi-major axis

1.8640 AU

Eccentricity

0.226

Inclination

— °

Year Length

A year here lasts about 2.65 Earth years on a mildly elliptical path at a mean orbital distance of 1.8640 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.378

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Ment et al. 2018

Instrument

HIRES Spectrometer

Publication

2018-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2018 at W. M. Keck Observatory (12 shown).

HD 75784 c · Gas Giant HD 99706 c · Gas Giant HD 148164 c · Gas Giant HD 55696 b · Gas Giant HD 95089 c · Gas Giant HD 13167 b · Gas Giant HD 18015 b · Gas Giant HAT-P-11 c · Gas Giant HD 156279 c · Gas Giant HD 180053 b · Gas Giant HD 114783 c · Gas Giant HD 72490 b · Gas Giant

Host System: HD 98736

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,271 K — cooler than the Sun (5,778 K)

Estimated Age

7.39 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.930 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

0.36

Extended Stellar Properties

Surface gravity (log g)

4.473 dex

Stellar density

1.649 g/cm³

Systemic radial velocity

-3.35 km/s

Metallicity ratio

[Fe/H]

Distance

32.45 parsec

Light-years 105.82 ly

V-band magnitude

7.93 mag

Voyager-speed travel 1,866,211 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

30.792 mas

Total Proper Motion

177.921 mas/yr

PM Right Ascension

-152.00 mas/yr

PM Declination

-92.48 mas/yr

Galactic Cartesian (pc)

x = -0.937 · y = 0.158 · z = 0.312

Equatorial (J2000)

RA 170.45490° · Dec 18.18961°

Galactic ℓ, b

231.648° · 67.523°

Ecliptic λ, β

163.993° · 12.929°

HTM-20 index

509732899