Key parameters at a glance

A radius of 13.30 Earth radii
A mass of 731.01 Earth masses
Surface gravity around 4.13 g
An orbital period of 491.540 days
Semi-major axis 1.3600 AU
Distance from Earth 355.69 light-years
Earth Similarity Index 0.377
Travel time at Voyager 1 speed 6,272,583 years

1 sibling around HD 147873

HD 147873 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 147873 b	Gas Giant	12.80	1,633.65	116.596	—	2016
HD 147873 c this	Gas Giant	13.30	731.01	491.540	—	2016

HD 147873 c Planet Profile

Physical Specs

Radius

13.30 R⊕

Radius (Jupiter)

1.190 R♃

Mass

731.01 M⊕

Mass (Jupiter)

2.300 M♃

Density

1.71 g/cm³

Surface Gravity

4.13 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.377

HZ Position Unknown

Controversial No

Discovery

Year 2016

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#793of 1771

top 44.7%

This planet

13.30R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 b 13.30 R⊕ HD 129445 b 13.30 R⊕ GJ 876 b 13.30 R⊕

Metric	Earth	HD 147873 c	Jupiter
Radius (R⊕)	1.00	13.30	11.21
Mass (M⊕)	1.00	731.01	317.83
Density (g/cm³)	5.51	1.71	1.33
Surface Gravity (g)	1.00	4.13	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	731.009 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 147873

HIP

HIP 80486

TIC

TIC 211080657

Gaia DR2

Gaia DR2 6024733935303422208

Gaia DR3

Gaia DR3 6024733935303422208

System

HD 147873

Percentile among Gas Giant cohort

Radius 13.300 R⊕ · percentile 53 / cohort 1771

Mass 731.009 M⊕ · percentile 59 / cohort 1747

Orbital period 491.54 d · percentile 67 / cohort 1533

Distance 109.06 pc · percentile 36 / cohort 1759

ESI 0.377 · percentile 78 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

491.540 days

Semi-major axis

1.3600 AU

Eccentricity

0.230

Inclination

— °

Year Length

A year here lasts about 1.35 Earth years on a mildly elliptical path at a mean orbital distance of 1.3600 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.377

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 147873

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,972 K — hotter than the Sun (5,778 K)

Estimated Age

4.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

2.290 R☉

Stellar Mass

1.380 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

3.860 dex

Stellar density

0.113 g/cm³

Systemic radial velocity

23.28 km/s

Rotational v·sin i

5.90 km/s

Activity index (log R'HK)

-5.240

Metallicity ratio

[Fe/H]

Distance

109.06 parsec

Light-years 355.69 ly

V-band magnitude

7.96 mag

Voyager-speed travel 6,272,583 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

9.142 mas

Total Proper Motion

29.490 mas/yr

PM Right Ascension

-18.71 mas/yr

PM Declination

-22.80 mas/yr

Galactic Cartesian (pc)

x = -0.333 · y = -0.764 · z = -0.553

Equatorial (J2000)

RA 246.43805° · Dec -33.56722°

Galactic ℓ, b

345.985° · 10.846°

Ecliptic λ, β

250.107° · -11.741°

HTM-20 index

-281518980