Key parameters at a glance
- A radius of 3.23 Earth radii
- A mass of 10.52 Earth masses
- Surface gravity around 1.01 g
- An orbital period of 41.763 days
- Semi-major axis 0.2292 AU
- Distance from Earth 71.76 light-years
- Earth Similarity Index 0.615
- Travel time at Voyager 1 speed 1,265,479 years
3 siblings around HD 164922
HD 164922 e 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 | Super-Earth | 1.83 | 4.00 | 12.458 | — | 2020 |
| HD 164922 e this | 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 e Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#325of 1978
top 16.4%
This planet
3.23R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 164922 e | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.23 | 11.21 |
| Mass (M⊕) | 1.00 | 10.52 | 317.83 |
| Density (g/cm³) | 5.51 | 1.72 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.01 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 10.520 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 164922
HIP
HIP 88348
TIC
TIC 159019691
Gaia DR2
Gaia DR2 4582680493669880704
Gaia DR3
Gaia DR3 4582680493669880704
System
HD 164922
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 41.76 Earth days (11.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2292 AU.
Extended Orbital Architecture
RV semi-amplitude (K)
2.060 m/s
Transit mid-time (BJD)
2,455,256.6000
Long. of periastron (ω)
-17.19°
Angular separation (arcsec)
10.40000
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.615
0 = alien, 1 = Earth-identical
Discovery Paper
Primary reference
Rosenthal et al. 2021Instrument
Multiple Instruments
Publication
2021-07
Observation locale
Ground
Discovery cohort
Planets confirmed in 2021 at Multiple Observatories (12 shown).
Host System: HD 164922
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,393 K — cooler than the Sun (5,778 K)
Estimated Age
9.58 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.002 R☉
Stellar Mass
0.921 M☉
Metallicity [Fe/H]
0.20
Extended Stellar Properties
Surface gravity (log g)
4.398 dex
Stellar density
1.320 g/cm³
Systemic radial velocity
20.36 km/s
Rotational v·sin i
1.84 km/s
Rotation period
42.30 days
Activity index (log R'HK)
-5.050
Metallicity ratio
[Fe/H]
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
1
RV measurements
1
Stellar spectra
6
Archive notes
2
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