Key parameters at a glance

A radius of 1.60 Earth radii
A mass of 4.74 Earth masses
Surface gravity around 1.85 g
An orbital period of 3.093 days
Semi-major axis 0.0388 AU
Equilibrium temperature 1,015 K (742 °C)
Distance from Earth 21.30 light-years
Earth Similarity Index 0.287
Travel time at Voyager 1 speed 375,663 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around HD 219134

HD 219134 b shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 219134 b this	Super-Earth	1.60	4.74	3.093	1,015	2015
HD 219134 c	Super-Earth	1.51	4.36	6.765	782	2015
HD 219134 d	Super-Earth	1.61	16.17	46.859	411	2015
HD 219134 h	Gas Giant	12.70	108.06	2,247.000	—	2015

HD 219134 b Planet Profile

Physical Specs

Radius

1.60 R⊕

Radius (Jupiter)

0.143 R♃

Mass

4.74 M⊕

Mass (Jupiter)

0.015 M♃

Density

6.34 g/cm³

Surface Gravity

1.85 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.287

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Radial Velocity

Facility Roque de los Muchachos Observatory

Telescope 3.58 m Telescopio Nazionale Galileo

Size rank in cohort

Rank by radius

#568of 1176

top 48.2%

This planet

1.60R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1702 b 1.60 R⊕ K2-133 c 1.60 R⊕ Kepler-394 b 1.60 R⊕

Metric	Earth	HD 219134 b	Jupiter
Radius (R⊕)	1.00	1.60	11.21
Mass (M⊕)	1.00	4.74	317.83
Density (g/cm³)	5.51	6.34	1.33
Surface Gravity (g)	1.00	1.85	2.53
Insolation (S⊕)	1.00	176.20	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4.740 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	3.814 M⊕	Lower bound from radial-velocity fitting.
Computed mass	4.336 M⊕	Model-computed mass (e.g. from mass-radius relation).

Star Catalogue Identifiers

HD 219134

HIP

HIP 114622

TIC

TIC 283722336

Gaia DR2

Gaia DR2 2009481748875806976

Gaia DR3

Gaia DR3 2009481748875806976

System

HD 219134

Percentile among Super-Earth cohort

Radius 1.602 R⊕ · percentile 52 / cohort 1176

Mass 4.740 M⊕ · percentile 92 / cohort 1176

Orbital period 3.09 d · percentile 23 / cohort 1164

Distance 6.53 pc · percentile 1 / cohort 1171

ESI 0.287 · percentile 33 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

3.093 days

Semi-major axis

0.0388 AU

Eccentricity

0.000

Inclination

85.05 °

Year Length

A year here lasts approximately 3.09 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0388 AU.

Transit Fingerprint

Depth

0.036 %

Duration

0.945 h

Impact parameter b

0.925

Rp / R★

0.018900

Transit midpoint (BJD)

2,457,126.6991

Photometric dip

Transit produces a flux drop of 358 ppm lasting ≈ 0.95 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018900

Semi-major axis / stellar radius

10.714

Impact parameter (b)

0.925

RV semi-amplitude (K)

2.381 m/s

Transit mid-time (BJD)

2,457,126.6991

Long. of periastron (ω)

0.00°

Angular separation (arcsec)

5.93000

Eq. Temperature

1,015K

(742 °C)

Insolation (S⊕)

176.20

Earth = 1.00

Earth Similarity (ESI)

0.287

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Motalebi et al. 2015

Instrument

HARPS-N Spectrograph

Publication

2015-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2015 at Roque de los Muchachos Observatory (3 shown).

HD 219134 d · Super-Earth HD 219134 c · Super-Earth HD 219134 h · Gas Giant

Host System: HD 219134

Spectral Class

K-type orange

Effective Temperature

4,699 K — cooler than the Sun (5,778 K)

Estimated Age

11.00 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.778 R☉

Stellar Mass

0.810 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.567 dex

Stellar density

2.438 g/cm³

Systemic radial velocity

-18.42 km/s

Rotational v·sin i

0.40 km/s

Metallicity ratio

[Fe/H]

Distance

6.53 parsec

Light-years 21.30 ly

V-band magnitude

5.57 mag

Voyager-speed travel 375,663 yr

Multi-band Host Photometry — 7 bands

Astrometric Data

Parallax

153.081 mas

Total Proper Motion

2,095.381 mas/yr

PM Right Ascension

2,074.52 mas/yr

PM Declination

294.94 mas/yr

Galactic Cartesian (pc)

x = 0.531 · y = -0.110 · z = 0.840

Equatorial (J2000)

RA 348.33720° · Dec 57.16963°

Galactic ℓ, b

109.907° · -3.201°

Ecliptic λ, β

23.752° · 54.542°

HTM-20 index

331589954

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes

Similar Worlds

Kepler-1702 b

Super-Earth · K-type orange

Radius 1.60 R⊕ · 2,795.6 ly

EPIC 212499991 b

Super-Earth · K-type orange

Radius 1.60 R⊕ · 924.0 ly

Kepler-994 b

Super-Earth · K-type orange

Radius 1.60 R⊕ · 613.7 ly

Kepler-842 b

Super-Earth · K-type orange

Radius 1.60 R⊕ · 1,737.5 ly

Kepler-80 e

Super-Earth · K-type orange

Radius 1.60 R⊕ · 1,205.0 ly

Kepler-1804 b

Super-Earth · K-type orange

Radius 1.60 R⊕ · 1,417.0 ly

Explore Related Categories

Super-Earth Planets Radial Velocity Discoveries Roque de los Muchachos Observatory Mission K-type orange Hosts