Key parameters at a glance

A radius of 13.10 Earth radii
A mass of 1,048.83 Earth masses
Surface gravity around 6.11 g
An orbital period of 2,278.000 days
Semi-major axis 3.8700 AU
Distance from Earth 403.78 light-years
Earth Similarity Index 0.403
Travel time at Voyager 1 speed 7,120,737 years

HD 18015 b Planet Profile

Physical Specs

Radius

13.10 R⊕

Radius (Jupiter)

1.170 R♃

Mass

1,048.83 M⊕

Mass (Jupiter)

3.300 M♃

Density

2.56 g/cm³

Surface Gravity

6.11 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.403

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

#910of 1771

top 51.3%

This planet

13.10R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

GJ 3021 b 13.10 R⊕ HD 221287 b 13.10 R⊕ HD 37605 c 13.10 R⊕

Metric	Earth	HD 18015 b	Jupiter
Radius (R⊕)	1.00	13.10	11.21
Mass (M⊕)	1.00	1,048.83	317.83
Density (g/cm³)	5.51	2.56	1.33
Surface Gravity (g)	1.00	6.11	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,048.834 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	1,010.699 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 18015

HIP

HIP 13467

TIC

TIC 36883072

Gaia DR2

Gaia DR2 5173468908975401856

Gaia DR3

Gaia DR3 5173468908975401856

System

HD 18015

Percentile among Gas Giant cohort

Radius 13.100 R⊕ · percentile 46 / cohort 1771

Mass 1,048.834 M⊕ · percentile 67 / cohort 1747

Orbital period 2,278.00 d · percentile 86 / cohort 1533

Distance 123.80 pc · percentile 39 / cohort 1759

ESI 0.403 · percentile 86 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,278.000 days

Semi-major axis

3.8700 AU

Eccentricity

0.148

Inclination

69.00 °

Year Length

A year here lasts about 6.24 Earth years on a mildly elliptical path at a mean orbital distance of 3.8700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.403

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

Luhn et al. 2019

Instrument

HIRES Spectrometer

Publication

2019-04

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 HAT-P-11 c · Gas Giant HD 156279 c · Gas Giant HD 98736 b · Gas Giant HD 180053 b · Gas Giant HD 114783 c · Gas Giant HD 72490 b · Gas Giant

Host System: HD 18015

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,603 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

3.130 R☉

Stellar Mass

1.490 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

3.640 dex

Systemic radial velocity

18.60 km/s

Rotational v·sin i

4.00 km/s

Metallicity ratio

[Fe/H]

Distance

123.80 parsec

Light-years 403.78 ly

V-band magnitude

7.89 mag

Voyager-speed travel 7,120,737 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

8.049 mas

Total Proper Motion

63.203 mas/yr

PM Right Ascension

63.05 mas/yr

PM Declination

-4.36 mas/yr

Galactic Cartesian (pc)

x = 0.718 · y = 0.678 · z = -0.154

Equatorial (J2000)

RA 43.36363° · Dec -8.84804°

Galactic ℓ, b

186.319° · -55.875°

Ecliptic λ, β

37.998° · -24.267°

HTM-20 index

-761264684