Key parameters at a glance

A radius of 1.83 Earth radii
A mass of 4.00 Earth masses
Surface gravity around 1.19 g
An orbital period of 12.458 days
Semi-major axis 0.1030 AU
Distance from Earth 71.76 light-years
Earth Similarity Index 0.818
Travel time at Voyager 1 speed 1,265,479 years

3 siblings around HD 164922

HD 164922 d 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 164922 d this	Super-Earth	1.83	4.00	12.458	—	2020
HD 164922 e	Sub-Neptune	3.23	10.52	41.763	—	2021
HD 164922 c	Sub-Neptune	3.66	13.00	75.740	401	2016
HD 164922 b	Gas Giant	13.30	116.00	1,207.000	159	2005

HD 164922 d Planet Profile

Physical Specs

Radius

1.83 R⊕

Radius (Jupiter)

0.163 R♃

Mass

4.00 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.59 g/cm³

Surface Gravity

1.19 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.818

HZ Position Unknown

Controversial No

Discovery

Year 2020

Method Radial Velocity

Facility Roque de los Muchachos Observatory

Telescope 3.58 m Telescopio Nazionale Galileo

Size rank in cohort

Rank by radius

#221of 1176

top 18.7%

This planet

1.83R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

WASP-47 e 1.83 R⊕ Kepler-110 b 1.83 R⊕ K2-316 c 1.83 R⊕

Metric	Earth	HD 164922 d	Jupiter
Radius (R⊕)	1.00	1.83	11.21
Mass (M⊕)	1.00	4.00	317.83
Density (g/cm³)	5.51	3.59	1.33
Surface Gravity (g)	1.00	1.19	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	4.000 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 164922

HIP

HIP 88348

TIC

TIC 159019691

Gaia DR2

Gaia DR2 4582680493669880704

Gaia DR3

Gaia DR3 4582680493669880704

System

HD 164922

Percentile among Super-Earth cohort

Radius 1.830 R⊕ · percentile 80 / cohort 1176

Mass 4.000 M⊕ · percentile 73 / cohort 1176

Orbital period 12.46 d · percentile 71 / cohort 1164

Distance 22.00 pc · percentile 4 / cohort 1171

ESI 0.818 · percentile 91 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

12.458 days

Semi-major axis

0.1030 AU

Eccentricity

0.120

Inclination

— °

Year Length

A year here lasts approximately 12.46 Earth days (3.4% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1030 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

1.300 m/s

Transit mid-time (BJD)

2,455,198.5800

Long. of periastron (ω)

-48.00°

Angular separation (arcsec)

4.68000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.818

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Benatti et al. 2020

Instrument

HARPS-N Spectrograph

Publication

2020-07

Observation locale

Ground

Discovery cohort

Planets confirmed in 2020 at Roque de los Muchachos Observatory (2 shown).

BD-11 4672 c · Neptune-like GJ 9689 b · Sub-Neptune

Host System: HD 164922

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,390 K — cooler than the Sun (5,778 K)

Estimated Age

9.58 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.946 R☉

Stellar Mass

0.926 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

1.320 g/cm³

Systemic radial velocity

20.36 km/s

Rotational v·sin i

2.00 km/s

Rotation period

42.30 days

Activity index (log R'HK)

-5.050

Metallicity ratio

[Fe/H]

Distance

22.00 parsec

Light-years 71.76 ly

V-band magnitude

7.01 mag

Voyager-speed travel 1,265,479 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

45.422 mas

Total Proper Motion

717.364 mas/yr

PM Right Ascension

389.65 mas/yr

PM Declination

-602.31 mas/yr

Galactic Cartesian (pc)

x = 0.010 · y = -0.896 · z = 0.443

Equatorial (J2000)

RA 270.63047° · Dec 26.31041°

Galactic ℓ, b

52.296° · 21.783°

Ecliptic λ, β

270.871° · 49.748°

HTM-20 index

-1181639783

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes