Key parameters at a glance
- A radius of 1.72 Earth radii
- A mass of 7.42 Earth masses
- Surface gravity around 2.51 g
- An orbital period of 0.926 days
- Semi-major axis 0.0180 AU
- Equilibrium temperature 2,141 K (1868 °C)
- Distance from Earth 207.69 light-years
- Earth Similarity Index 0.113
- Travel time at Voyager 1 speed 3,662,698 years
HD 20329 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#373of 1176
top 31.6%
This planet
1.72R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | HD 20329 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.72 | 11.21 |
| Mass (M⊕) | 1.00 | 7.42 | 317.83 |
| Density (g/cm³) | 5.51 | 8.06 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.51 | 2.53 |
| Insolation (S⊕) | 1.00 | 3,474.00 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 7.420 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 20329
HIP
HIP 15249
TIC
TIC 333657795
Gaia DR2
Gaia DR2 30398648945512960
Gaia DR3
Gaia DR3 30398648945512960
System
HD 20329
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 22.2 hours long on a nearly circular orbit at a mean orbital distance of 0.0180 AU.
Transit Fingerprint
Depth
0.022 %
Duration
1.260 h
Impact parameter b
0.826
Rp / R★
0.013900
Transit midpoint (BJD)
2,459,472.1432
Photometric dip
Transit produces a flux drop of 221 ppm lasting ≈ 1.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.013900
Semi-major axis / stellar radius
3.420
Impact parameter (b)
0.826
RV semi-amplitude (K)
5.070 m/s
Occultation depth
0.002 ppm
Transit mid-time (BJD)
2,459,472.1432
Angular separation (arcsec)
0.28300
Eq. Temperature
2,141K
(1868 °C)
Insolation (S⊕)
3,474.00
Earth = 1.00
Earth Similarity (ESI)
0.113
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
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
Murgas et al. 2022Instrument
TESS CCD Array
Publication
2022-11
Observation locale
Space
Discovery cohort
Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 20329
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,596 K — cooler than the Sun (5,778 K)
Estimated Age
11.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.130 R☉
Stellar Mass
0.900 M☉
Metallicity [Fe/H]
-0.07
Extended Stellar Properties
Surface gravity (log g)
4.400 dex
Stellar density
0.880 g/cm³
Systemic radial velocity
-71.54 km/s
Rotational v·sin i
3.50 km/s
Activity index (log R'HK)
-5.030
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
15.675 mas
Total Proper Motion
231.124 mas/yr
PM Right Ascension
111.85 mas/yr
PM Declination
-202.26 mas/yr
Galactic Cartesian (pc)
x = 0.629 · y = 0.729 · z = 0.270
Equatorial (J2000)
RA 49.17812° · Dec 15.65635°
Galactic ℓ, b
166.768° · -34.571°
Ecliptic λ, β
50.945° · -2.421°
HTM-20 index
1425649486
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