Key parameters at a glance
- A radius of 3.20 Earth radii
- A mass of 57.20 Earth masses
- Surface gravity around 5.59 g
- An orbital period of 0.777 days
- Semi-major axis 0.0159 AU
- Equilibrium temperature 1,871 K (1598 °C)
- Distance from Earth 726.85 light-years
- Earth Similarity Index 0.111
- Travel time at Voyager 1 speed 12,817,914 years
- Almost certainly tidally locked to its host star given the close orbit
TOI-332 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#348of 1978
top 17.5%
This planet
3.20R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | TOI-332 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.20 | 11.21 |
| Mass (M⊕) | 1.00 | 57.20 | 317.83 |
| Density (g/cm³) | 5.51 | 9.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 5.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 4,180.32 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 57.200 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 139285832
Gaia DR2
Gaia DR2 6529471108882243840
Gaia DR3
Gaia DR3 6529471108882243840
System
TOI-332
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 18.6 hours long on a nearly circular orbit at a mean orbital distance of 0.0159 AU.
Transit Fingerprint
Depth
0.083 %
Duration
1.520 h
Impact parameter b
0.250
Rp / R★
0.034100
Transit midpoint (BJD)
2,459,062.4447
Photometric dip
Transit produces a flux drop of 830 ppm lasting ≈ 1.52 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034100
Semi-major axis / stellar radius
3.940
Impact parameter (b)
0.250
RV semi-amplitude (K)
43.000 m/s
Transit mid-time (BJD)
2,459,062.4447
Long. of periastron (ω)
0.00°
Angular separation (arcsec)
0.07130
Eq. Temperature
1,871K
(1598 °C)
Insolation (S⊕)
4,180.32
Earth = 1.00
Earth Similarity (ESI)
0.111
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
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
Osborn et al. 2023Instrument
TESS CCD Array
Publication
2023-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).
Host System: TOI-332
Spectral Class
K-type orange
Effective Temperature
5,251 K — cooler than the Sun (5,778 K)
Estimated Age
5.00 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.870 R☉
Stellar Mass
0.880 M☉
Metallicity [Fe/H]
0.26
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
1.409 g/cm³
Rotational v·sin i
1.50 km/s
Rotation period
35.60 days
Activity index (log R'HK)
-4.831
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
4.460 mas
Total Proper Motion
51.839 mas/yr
PM Right Ascension
35.91 mas/yr
PM Declination
-37.39 mas/yr
Galactic Cartesian (pc)
x = 0.693 · y = -0.147 · z = -0.706
Equatorial (J2000)
RA 348.05895° · Dec -44.87649°
Galactic ℓ, b
344.545° · -63.411°
Ecliptic λ, β
329.081° · -36.089°
HTM-20 index
-33463847
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