Key parameters at a glance

A radius of 13.70 Earth radii
A mass of 352.79 Earth masses
Surface gravity around 1.88 g
An orbital period of 1,179.000 days
Semi-major axis 2.2000 AU
Distance from Earth 265.78 light-years
Earth Similarity Index 0.318
Travel time at Voyager 1 speed 4,687,070 years

HD 9174 b Planet Profile

Physical Specs

Radius

13.70 R⊕

Radius (Jupiter)

1.230 R♃

Mass

352.79 M⊕

Mass (Jupiter)

1.110 M♃

Density

0.75 g/cm³

Surface Gravity

1.88 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.318

HZ Position Unknown

Controversial No

Discovery

Year 2016

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#554of 1771

top 31.2%

This planet

13.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 148164 b 13.70 R⊕ HD 114783 b 13.70 R⊕ HD 159243 b 13.70 R⊕

Metric	Earth	HD 9174 b	Jupiter
Radius (R⊕)	1.00	13.70	11.21
Mass (M⊕)	1.00	352.79	317.83
Density (g/cm³)	5.51	0.75	1.33
Surface Gravity (g)	1.00	1.88	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	352.791 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 9174

HIP

HIP 6993

TIC

TIC 439501096

Gaia DR2

Gaia DR2 5044029491007060608

Gaia DR3

Gaia DR3 5044029491007060608

System

HD 9174

Percentile among Gas Giant cohort

Radius 13.700 R⊕ · percentile 66 / cohort 1771

Mass 352.791 M⊕ · percentile 38 / cohort 1747

Orbital period 1,179.00 d · percentile 79 / cohort 1533

Distance 81.49 pc · percentile 31 / cohort 1759

ESI 0.318 · percentile 62 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,179.000 days

Semi-major axis

2.2000 AU

Eccentricity

0.120

Inclination

— °

Year Length

A year here lasts about 3.23 Earth years on a mildly elliptical path at a mean orbital distance of 2.2000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.318

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Jenkins et al. 2017

Instrument

Multiple Instruments

Publication

2017-04

Observation locale

Ground

Discovery cohort

Planets confirmed in 2016 at Multiple Observatories (12 shown).

HD 42618 b · Sub-Neptune HD 164922 c · Sub-Neptune HD 224538 b · Gas Giant HD 30177 c · Gas Giant Kepler-56 d · Gas Giant HD 72892 b · Gas Giant HD 147873 b · Gas Giant HIP 8541 b · Gas Giant HD 68402 b · Gas Giant HD 86950 b · Gas Giant HD 165155 b · Gas Giant rho CrB c · Neptune-like

Host System: HD 9174

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,577 K — cooler than the Sun (5,778 K)

Estimated Age

9.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.670 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.39

Extended Stellar Properties

Surface gravity (log g)

4.030 dex

Stellar density

0.284 g/cm³

Systemic radial velocity

23.25 km/s

Rotational v·sin i

2.10 km/s

Metallicity ratio

[Fe/H]

Distance

81.49 parsec

Light-years 265.78 ly

V-band magnitude

8.40 mag

Voyager-speed travel 4,687,070 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

12.243 mas

Total Proper Motion

187.324 mas/yr

PM Right Ascension

34.76 mas/yr

PM Declination

-184.07 mas/yr

Galactic Cartesian (pc)

x = 0.870 · y = 0.361 · z = -0.336

Equatorial (J2000)

RA 22.50434° · Dec -19.60529°

Galactic ℓ, b

174.586° · -78.391°

Ecliptic λ, β

12.772° · -26.826°

HTM-20 index

-1342160222