Key parameters at a glance

A radius of 12.20 Earth radii
A mass of 5,102.42 Earth masses
Surface gravity around 34.28 g
An orbital period of 4,789.873 days
Semi-major axis 5.6570 AU
Distance from Earth 238.47 light-years
Earth Similarity Index 0.320
Travel time at Voyager 1 speed 4,205,342 years

1 sibling around HD 219828

HD 219828 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 219828 b	Neptune-like	4.59	19.07	3.835	—	2007
HD 219828 c this	Gas Giant	12.20	5,102.42	4,789.873	—	2016

HD 219828 c Planet Profile

Physical Specs

Radius

12.20 R⊕

Radius (Jupiter)

1.090 R♃

Mass

5,102.42 M⊕

Mass (Jupiter)

16.054 M♃

Density

15.40 g/cm³

Surface Gravity

34.28 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.320

HZ Position Unknown

Controversial No

Discovery

Year 2016

Method Radial Velocity

Facility Multiple Facilities

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#1410of 1771

top 79.6%

This planet

12.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

FU Tau b 12.20 R⊕ HD 168443 c 12.20 R⊕ HIP 5158 c 12.20 R⊕

Metric	Earth	HD 219828 c	Jupiter
Radius (R⊕)	1.00	12.20	11.21
Mass (M⊕)	1.00	5,102.42	317.83
Density (g/cm³)	5.51	15.40	1.33
Surface Gravity (g)	1.00	34.28	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5,102.417 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	4,799.233 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 219828

HIP

HIP 115100

TIC

TIC 243085377

Gaia DR2

Gaia DR2 2824958015312906240

Gaia DR3

Gaia DR3 2824958015312906240

System

HD 219828

Percentile among Gas Giant cohort

Radius 12.200 R⊕ · percentile 19 / cohort 1771

Mass 5,102.417 M⊕ · percentile 95 / cohort 1747

Orbital period 4,789.87 d · percentile 92 / cohort 1533

Distance 73.11 pc · percentile 29 / cohort 1759

ESI 0.320 · percentile 63 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

4,789.873 days

Semi-major axis

5.6570 AU

Eccentricity

0.811

Inclination

122.82 °

Year Length

A year here lasts about 13.11 Earth years on a highly eccentric trajectory at a mean orbital distance of 5.6570 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.320

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Santos et al. 2016

Instrument

Multiple Instruments

Publication

2016-07

Observation locale

Ground

Host System: HD 219828

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,891 K — hotter than the Sun (5,778 K)

Estimated Age

5.69 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.560 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.19

Extended Stellar Properties

Surface gravity (log g)

4.170 dex

Stellar density

0.326 g/cm³

Systemic radial velocity

-24.03 km/s

Rotational v·sin i

2.90 km/s

Rotation period

31.70 days

Metallicity ratio

[Fe/H]

Distance

73.11 parsec

Light-years 238.47 ly

V-band magnitude

8.04 mag

Voyager-speed travel 4,205,342 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

13.649 mas

Total Proper Motion

7.887 mas/yr

PM Right Ascension

-5.08 mas/yr

PM Declination

6.04 mas/yr

Galactic Cartesian (pc)

x = 0.932 · y = -0.170 · z = 0.320

Equatorial (J2000)

RA 349.69470° · Dec 18.64575°

Galactic ℓ, b

94.266° · -39.013°

Ecliptic λ, β

358.255° · 21.147°

HTM-20 index

1058153528

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes