Key parameters at a glance

A radius of 12.90 Earth radii
A mass of 1,525.58 Earth masses
Surface gravity around 9.17 g
An orbital period of 810.000 days
Semi-major axis 1.9100 AU
Distance from Earth 108.36 light-years
Earth Similarity Index 0.427
Travel time at Voyager 1 speed 1,910,948 years

Context from the literature

38 Virginis b is a super-Jupiter exoplanet orbiting within the habitable zone of the star 38 Virginis about 108.5 light-years from Earth in the constellation Virgo. The exoplanet was found by using the radial velocity method, from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star.

Excerpted from Wikipedia · full article

HD 111998 b Planet Profile

Physical Specs

Radius

12.90 R⊕

Radius (Jupiter)

1.150 R♃

Mass

1,525.58 M⊕

Mass (Jupiter)

4.800 M♃

Density

3.91 g/cm³

Surface Gravity

9.17 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.427

HZ Position Unknown

Controversial No

Discovery

Year 2016

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#1011of 1771

top 57.0%

This planet

12.90R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 55696 b 12.90 R⊕ HD 24040 b 12.90 R⊕ BD-210397 c 12.90 R⊕

Metric	Earth	HD 111998 b	Jupiter
Radius (R⊕)	1.00	12.90	11.21
Mass (M⊕)	1.00	1,525.58	317.83
Density (g/cm³)	5.51	3.91	1.33
Surface Gravity (g)	1.00	9.17	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,525.576 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,433.413 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 111998

HIP

HIP 62875

TIC

TIC 53304943

Gaia DR2

Gaia DR2 3679242575447826432

Gaia DR3

Gaia DR3 3679242575447826432

System

HD 111998

Percentile among Gas Giant cohort

Radius 12.900 R⊕ · percentile 41 / cohort 1771

Mass 1,525.576 M⊕ · percentile 74 / cohort 1747

Orbital period 810.00 d · percentile 74 / cohort 1533

Distance 33.22 pc · percentile 9 / cohort 1759

ESI 0.427 · percentile 93 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

810.000 days

Semi-major axis

1.9100 AU

Eccentricity

0.130

Inclination

90.00 °

Year Length

A year here lasts about 2.22 Earth years on a mildly elliptical path at a mean orbital distance of 1.9100 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.427

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Borgniet et al. 2017

Instrument

HARPS Spectrograph

Publication

2017-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at La Silla Observatory (5 shown).

TRAPPIST-1 d · Rocky Terrestrial TRAPPIST-1 c · Rocky Terrestrial TRAPPIST-1 b · Rocky Terrestrial GJ 536 b · Sub-Neptune NGC 2682 YBP 401 b · Gas Giant

Host System: HD 111998

Spectral Class

F-type yellow-white

Effective Temperature

6,557 K — hotter than the Sun (5,778 K)

Estimated Age

1.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.450 R☉

Stellar Mass

1.400 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.190 dex

Stellar density

0.665 g/cm³

Systemic radial velocity

-7.30 km/s

Rotational v·sin i

20.00 km/s

Activity index (log R'HK)

-4.580

Metallicity ratio

[Fe/H]

Distance

33.22 parsec

Light-years 108.36 ly

V-band magnitude

6.11 mag

Voyager-speed travel 1,910,948 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

30.070 mas

Total Proper Motion

262.666 mas/yr

PM Right Ascension

-262.64 mas/yr

PM Declination

-3.85 mas/yr

Galactic Cartesian (pc)

x = -0.971 · y = -0.230 · z = -0.062

Equatorial (J2000)

RA 193.29535° · Dec -3.55311°

Galactic ℓ, b

303.784° · 59.316°

Ecliptic λ, β

193.610° · 1.974°

HTM-20 index

1570750552

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