Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,082.94 Earth masses
Surface gravity around 19.73 g
An orbital period of 5,384.000 days
Semi-major axis 5.9700 AU
Distance from Earth 137.55 light-years
Earth Similarity Index 0.388
Travel time at Voyager 1 speed 2,425,673 years

HD 98649 b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,082.94 M⊕

Mass (Jupiter)

9.700 M♃

Density

8.67 g/cm³

Surface Gravity

19.73 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.388

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	HD 98649 b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,082.94	317.83
Density (g/cm³)	5.51	8.67	1.33
Surface Gravity (g)	1.00	19.73	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,082.936 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	2,110.381 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 98649

HIP

HIP 55409

TIC

TIC 437258837

Gaia DR2

Gaia DR2 3538141457982396928

Gaia DR3

Gaia DR3 3538141457982396928

System

HD 98649

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,082.936 M⊕ · percentile 87 / cohort 1747

Orbital period 5,384.00 d · percentile 93 / cohort 1533

Distance 42.17 pc · percentile 15 / cohort 1759

ESI 0.388 · percentile 82 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5,384.000 days

Semi-major axis

5.9700 AU

Eccentricity

0.852

Inclination

43.70 °

Year Length

A year here lasts about 14.74 Earth years on a highly eccentric trajectory at a mean orbital distance of 5.9700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.388

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

Marmier et al. 2013

Instrument

CORALIE Spectrograph

Publication

2013-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at La Silla Observatory (11 shown).

GJ 676 A d · Super-Earth GJ 667 C b · Sub-Neptune GJ 676 A e · Sub-Neptune HD 77338 b · Neptune-like HD 166724 b · Gas Giant HD 219077 b · Gas Giant HD 196067 b · Gas Giant HD 27631 b · Gas Giant HD 220689 b · Gas Giant GJ 3470 b · Neptune-like HD 106515 A b · Gas Giant

Host System: HD 98649

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,759 K — cooler than the Sun (5,778 K)

Estimated Age

4.44 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.010 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

1.370 g/cm³

Systemic radial velocity

4.27 km/s

Rotational v·sin i

2.22 km/s

Rotation period

26.44 days

Activity index (log R'HK)

-4.960

Metallicity ratio

[Fe/H]

Distance

42.17 parsec

Light-years 137.55 ly

V-band magnitude

8.00 mag

Voyager-speed travel 2,425,673 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

23.683 mas

Total Proper Motion

267.598 mas/yr

PM Right Ascension

-199.89 mas/yr

PM Declination

-177.92 mas/yr

Galactic Cartesian (pc)

x = -0.906 · y = 0.156 · z = -0.394

Equatorial (J2000)

RA 170.21477° · Dec -23.21811°

Galactic ℓ, b

277.305° · 35.106°

Ecliptic λ, β

180.851° · -25.077°

HTM-20 index

1649311289