Key parameters at a glance

A radius of 1.51 Earth radii
A mass of 4.36 Earth masses
Surface gravity around 1.91 g
An orbital period of 6.765 days
Semi-major axis 0.0653 AU
Equilibrium temperature 782 K (509 °C)
Distance from Earth 21.30 light-years
Earth Similarity Index 0.375
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 c 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	Super-Earth	1.60	4.74	3.093	1,015	2015
HD 219134 c this	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 c Planet Profile

Physical Specs

Radius

1.51 R⊕

Radius (Jupiter)

0.135 R♃

Mass

4.36 M⊕

Mass (Jupiter)

0.014 M♃

Density

6.95 g/cm³

Surface Gravity

1.91 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.375

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

#729of 1176

top 61.9%

This planet

1.51R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-1885 b 1.51 R⊕ Kepler-249 c 1.51 R⊕ Kepler-389 b 1.51 R⊕

Metric	Earth	HD 219134 c	Jupiter
Radius (R⊕)	1.00	1.51	11.21
Mass (M⊕)	1.00	4.36	317.83
Density (g/cm³)	5.51	6.95	1.33
Surface Gravity (g)	1.00	1.91	2.53
Insolation (S⊕)	1.00	62.10	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4.360 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	3.120 M⊕	Lower bound from radial-velocity fitting.

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 1.511 R⊕ · percentile 38 / cohort 1176

Mass 4.360 M⊕ · percentile 84 / cohort 1176

Orbital period 6.76 d · percentile 51 / cohort 1164

Distance 6.53 pc · percentile 1 / cohort 1171

ESI 0.375 · percentile 56 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

6.765 days

Semi-major axis

0.0653 AU

Eccentricity

0.062

Inclination

87.28 °

Year Length

A year here lasts approximately 6.76 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0653 AU.

Transit Fingerprint

Depth

0.032 %

Duration

1.660 h

Impact parameter b

0.813

Rp / R★

0.017760

Transit midpoint (BJD)

2,457,474.0459

Photometric dip

Transit produces a flux drop of 318 ppm lasting ≈ 1.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017760

Impact parameter (b)

0.813

RV semi-amplitude (K)

1.697 m/s

Transit mid-time (BJD)

2,457,474.0459

Long. of periastron (ω)

70.00°

Angular separation (arcsec)

10.00000

Eq. Temperature

782K

(509 °C)

Insolation (S⊕)

62.10

Earth = 1.00

Earth Similarity (ESI)

0.375

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. 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 b · 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-828 b

Super-Earth · K-type orange

Radius 1.51 R⊕ · 1,876.4 ly

Kepler-1324 b

Super-Earth · K-type orange

Radius 1.51 R⊕ · 1,571.0 ly

K2-141 b

Super-Earth · K-type orange

Radius 1.51 R⊕ · 201.8 ly

Kepler-1809 b

Super-Earth · K-type orange

Radius 1.51 R⊕ · 1,335.9 ly

TOI-2345 b

Super-Earth · K-type orange

Radius 1.50 R⊕ · 266.3 ly

Kepler-1853 b

Super-Earth · K-type orange

Radius 1.52 R⊕ · 1,834.1 ly

Explore Related Categories

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