Key parameters at a glance
- A radius of 9.07 Earth radii
- A mass of 74.10 Earth masses
- Surface gravity around 0.90 g
- An orbital period of 18.712 days
- Semi-major axis 0.1450 AU
- Equilibrium temperature 798 K (525 °C)
- Distance from Earth 263.10 light-years
- Earth Similarity Index 0.185
- Travel time at Voyager 1 speed 4,639,744 years
HD 332231 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#84of 574
top 14.5%
This planet
9.07R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | HD 332231 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 9.07 | 11.21 |
| Mass (M⊕) | 1.00 | 74.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.90 | 2.53 |
| Insolation (S⊕) | 1.00 | 98.09 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 74.100 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
HD
HD 332231
TIC
TIC 199376584
Gaia DR2
Gaia DR2 2056007995732413312
Gaia DR3
Gaia DR3 2056007995732413312
System
HD 332231
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 18.71 Earth days (5.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1450 AU.
Transit Fingerprint
Depth
0.487 %
Duration
6.168 h
Impact parameter b
0.169
Rp / R★
0.065704
Transit midpoint (BJD)
2,458,692.2582
Photometric dip
Transit produces a flux drop of 4,867 ppm lasting ≈ 6.17 h.
Extended Orbital Architecture
Planet / star radius ratio
0.065704
Semi-major axis / stellar radius
24.250
Impact parameter (b)
0.169
RV semi-amplitude (K)
16.000 m/s
Transit mid-time (BJD)
2,458,692.2582
Long. of periastron (ω)
2.00°
Angular separation (arcsec)
1.80000
Eq. Temperature
798K
(525 °C)
Insolation (S⊕)
98.09
Earth = 1.00
Earth Similarity (ESI)
0.185
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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
Dalba et al. 2020Instrument
TESS CCD Array
Publication
2020-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: HD 332231
Spectral Class
F-type yellow-white
Effective Temperature
6,128 K — hotter than the Sun (5,778 K)
Estimated Age
2.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.266 R☉
Stellar Mass
1.164 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.296 dex
Stellar density
0.799 g/cm³
Systemic radial velocity
-23.17 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
12.368 mas
Total Proper Motion
39.673 mas/yr
PM Right Ascension
-36.87 mas/yr
PM Declination
-14.65 mas/yr
Galactic Cartesian (pc)
x = 0.497 · y = -0.666 · z = 0.555
Equatorial (J2000)
RA 306.74113° · Dec 33.74439°
Galactic ℓ, b
73.366° · -2.654°
Ecliptic λ, β
321.870° · 50.778°
HTM-20 index
-1097215019
Similar Worlds
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TOI-837 b
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Kepler-1746 b
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TOI-622 b
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