Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 425.89 Earth masses
Surface gravity around 2.30 g
An orbital period of 1,807.000 days
Semi-major axis 2.9800 AU
Distance from Earth 159.65 light-years
Earth Similarity Index 0.333
Travel time at Voyager 1 speed 2,815,424 years

HD 79498 b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.220 R♃

Mass

425.89 M⊕

Mass (Jupiter)

1.340 M♃

Density

0.93 g/cm³

Surface Gravity

2.30 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.333

HZ Position Unknown

Controversial No

Discovery

Year 2011

Method Radial Velocity

Facility McDonald Observatory

Telescope 2.7 m Harlan J. Smith Telescope

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 19994 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HIP 14810 c 13.60 R⊕

Metric	Earth	HD 79498 b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	425.89	317.83
Density (g/cm³)	5.51	0.93	1.33
Surface Gravity (g)	1.00	2.30	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	425.892 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 79498

HIP

HIP 45406

TIC

TIC 85998162

Gaia DR2

Gaia DR2 686996756484129664

Gaia DR3

Gaia DR3 686996756484129664

System

HD 79498

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 425.892 M⊕ · percentile 44 / cohort 1747

Orbital period 1,807.00 d · percentile 83 / cohort 1533

Distance 48.95 pc · percentile 19 / cohort 1759

ESI 0.333 · percentile 66 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,807.000 days

Semi-major axis

2.9800 AU

Eccentricity

0.575

Inclination

— °

Year Length

A year here lasts about 4.95 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.9800 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.333

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Robertson et al. 2012

Instrument

Tull Coude Spectrograph

Publication

2012-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2011 at McDonald Observatory (4 shown).

HD 220773 b · Gas Giant HD 240237 b · Gas Giant BD+48 738 b · Gas Giant HD 96127 b · Gas Giant

Host System: HD 79498

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,748 K — cooler than the Sun (5,778 K)

Estimated Age

2.71 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.050 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

1.010 g/cm³

Systemic radial velocity

19.92 km/s

Rotational v·sin i

2.00 km/s

Metallicity ratio

[Fe/H]

Distance

48.95 parsec

Light-years 159.65 ly

V-band magnitude

8.05 mag

Voyager-speed travel 2,815,424 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

20.401 mas

Total Proper Motion

201.061 mas/yr

PM Right Ascension

-127.31 mas/yr

PM Declination

-155.62 mas/yr

Galactic Cartesian (pc)

x = -0.691 · y = 0.605 · z = 0.397

Equatorial (J2000)

RA 138.78858° · Dec 23.37488°

Galactic ℓ, b

204.703° · 41.321°

Ecliptic λ, β

134.092° · 7.091°

HTM-20 index

-262680716

Observation Record

Photometric series

RV measurements

Archive notes