Key parameters at a glance
- A radius of 3.66 Earth radii
- A mass of 13.00 Earth masses
- Surface gravity around 0.97 g
- An orbital period of 25.201 days
- Semi-major axis 0.1430 AU
- Distance from Earth 42.82 light-years
- Earth Similarity Index 0.573
- Travel time at Voyager 1 speed 755,074 years
- Almost certainly tidally locked to its host star given the close orbit
HD 211970 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#107of 1978
top 5.4%
This planet
3.66R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | HD 211970 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.66 | 11.21 |
| Mass (M⊕) | 1.00 | 13.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.46 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.97 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Minimum mass (M sin i) | 13.000 M⊕ | Lower bound from radial-velocity fitting. |
Star Catalogue Identifiers
HD
HD 211970
HIP
HIP 110443
TIC
TIC 231704229
Gaia DR2
Gaia DR2 6508401923473282432
Gaia DR3
Gaia DR3 6508401923473282432
System
HD 211970
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 25.20 Earth days (6.9% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1430 AU.
Eq. Temperature
—
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.573
0 = alien, 1 = Earth-identical
Insufficient insolation data. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Feng et al. 2019Instrument
Carnegie Planet Finder Spectrograph
Publication
2019-06
Observation locale
Ground
Discovery cohort
Planets confirmed in 2019 at Las Campanas Observatory (12 shown).
Host System: HD 211970
Spectral Class
K-type orange
Effective Temperature
4,127 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.574 R☉
Stellar Mass
0.610 M☉
Metallicity [Fe/H]
—
Extended Stellar Properties
Surface gravity (log g)
4.692 dex
Stellar density
4.238 g/cm³
Systemic radial velocity
-5.60 km/s
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
76.146 mas
Total Proper Motion
298.649 mas/yr
PM Right Ascension
-184.15 mas/yr
PM Declination
235.12 mas/yr
Galactic Cartesian (pc)
x = 0.528 · y = -0.240 · z = -0.815
Equatorial (J2000)
RA 335.56616° · Dec -54.55960°
Galactic ℓ, b
337.247° · -51.449°
Ecliptic λ, β
314.130° · -40.699°
HTM-20 index
-220350557
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