Key parameters at a glance

A radius of 12.50 Earth radii
A mass of 3,057.51 Earth masses
Surface gravity around 19.57 g
An orbital period of 5,478.689 days
Semi-major axis 5.9350 AU
Distance from Earth 95.19 light-years
Earth Similarity Index 0.389
Travel time at Voyager 1 speed 1,678,732 years

HD 219077 b Planet Profile

Physical Specs

Radius

12.50 R⊕

Radius (Jupiter)

1.110 R♃

Mass

3,057.51 M⊕

Mass (Jupiter)

9.620 M♃

Density

8.60 g/cm³

Surface Gravity

19.57 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.389

HZ Position Unknown

Controversial No

Discovery

Year 2012

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#1235of 1771

top 69.7%

This planet

12.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 156279 c 12.50 R⊕ HD 33283 b 12.50 R⊕ HD 156279 b 12.50 R⊕

Metric	Earth	HD 219077 b	Jupiter
Radius (R⊕)	1.00	12.50	11.21
Mass (M⊕)	1.00	3,057.51	317.83
Density (g/cm³)	5.51	8.60	1.33
Surface Gravity (g)	1.00	19.57	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3,057.509 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	3,302.110 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 219077

HIP

HIP 114699

TIC

TIC 394125166

Gaia DR2

Gaia DR2 6489771832811810432

Gaia DR3

Gaia DR3 6489771832811810432

System

HD 219077

Percentile among Gas Giant cohort

Radius 12.500 R⊕ · percentile 28 / cohort 1771

Mass 3,057.509 M⊕ · percentile 87 / cohort 1747

Orbital period 5,478.69 d · percentile 93 / cohort 1533

Distance 29.19 pc · percentile 7 / cohort 1759

ESI 0.389 · percentile 82 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

5,478.689 days

Semi-major axis

5.9350 AU

Eccentricity

0.768

Inclination

90.18 °

Year Length

A year here lasts about 15.00 Earth years on a highly eccentric trajectory at a mean orbital distance of 5.9350 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.389

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

Marmier et al. 2013

Instrument

CORALIE Spectrograph

Publication

2013-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2012 at La Silla Observatory (11 shown).

GJ 676 A d · Super-Earth GJ 667 C b · Sub-Neptune GJ 676 A e · Sub-Neptune HD 77338 b · Neptune-like HD 166724 b · Gas Giant HD 98649 b · Gas Giant HD 196067 b · Gas Giant HD 27631 b · Gas Giant HD 220689 b · Gas Giant GJ 3470 b · Neptune-like HD 106515 A b · Gas Giant

Host System: HD 219077

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,362 K — cooler than the Sun (5,778 K)

Estimated Age

8.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.910 R☉

Stellar Mass

0.920 M☉

Metallicity [Fe/H]

-0.13

Extended Stellar Properties

Surface gravity (log g)

4.000 dex

Stellar density

0.170 g/cm³

Systemic radial velocity

-30.87 km/s

Rotational v·sin i

1.46 km/s

Activity index (log R'HK)

-5.220

Metallicity ratio

[Fe/H]

Distance

29.19 parsec

Light-years 95.19 ly

V-band magnitude

6.12 mag

Voyager-speed travel 1,678,732 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

34.234 mas

Total Proper Motion

639.181 mas/yr

PM Right Ascension

478.17 mas/yr

PM Declination

-424.15 mas/yr

Galactic Cartesian (pc)

x = 0.449 · y = -0.091 · z = -0.889

Equatorial (J2000)

RA 348.53194° · Dec -62.70183°

Galactic ℓ, b

320.402° · -50.998°

Ecliptic λ, β

315.793° · -51.172°

HTM-20 index

-314779159