Key parameters at a glance
- A radius of 2.20 Earth radii
- A mass of 5.48 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 17.706 days
- Equilibrium temperature 266 K (-7 °C)
- Distance from Earth 401.83 light-years
- Earth Similarity Index 0.762
- Travel time at Voyager 1 speed 7,086,284 years
- Almost certainly tidally locked to its host star given the close orbit
Context from the literature
K2-332 b is a potentially habitable Super-Earth or Mini-Neptune exoplanet with a radius of 2.2 earths. It is in the empirical habitable zone, receiving 1.17 times the light that Earth gets from the sun. Its star, K2-332, is type M4V, with a temperature of ~3300 K. It was detected using the transit method in 2016 and is 402 light-years away.
Excerpted from Wikipedia · full article
K2-332 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1673of 1978
top 84.5%
This planet
2.20R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-332 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.20 | 11.21 |
| Mass (M⊕) | 1.00 | 5.48 | 317.83 |
| Density (g/cm³) | 5.51 | 2.83 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | — | 0.037 |
Star Catalogue Identifiers
TIC
TIC 330621494
Gaia DR2
Gaia DR2 607158571490718208
Gaia DR3
Gaia DR3 607158571490718208
System
K2-332
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.71 Earth days (4.8% of a terrestrial year).
Transit Fingerprint
Depth
0.677 %
Duration
2.030 h
Impact parameter b
0.390
Rp / R★
0.070700
Transit midpoint (BJD)
2,457,156.4207
Photometric dip
Transit produces a flux drop of 6,770 ppm lasting ≈ 2.03 h.
Extended Orbital Architecture
Planet / star radius ratio
0.070700
Semi-major axis / stellar radius
66.300
Impact parameter (b)
0.390
Transit mid-time (BJD)
2,457,156.4207
Eq. Temperature
266K
(-7 °C)
Insolation (S⊕)
—
Earth = 1.00
Earth Similarity (ESI)
0.762
0 = alien, 1 = Earth-identical
Insufficient insolation data — surface water would be frozen. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
De Leon et al. 2021Instrument
Kepler CCD Array
Publication
2021-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at K2 (12 shown).
Host System: K2-332
Spectral Class
M-type red dwarf
Effective Temperature
3,315 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.280 R☉
Stellar Mass
0.270 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.970 dex
Stellar density
15.363 g/cm³
Rotation period
31.71 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
8.089 mas
Total Proper Motion
18.782 mas/yr
PM Right Ascension
-15.42 mas/yr
PM Declination
-10.73 mas/yr
Galactic Cartesian (pc)
x = -0.696 · y = 0.675 · z = 0.246
Equatorial (J2000)
RA 135.88327° · Dec 14.25050°
Galactic ℓ, b
214.467° · 35.616°
Ecliptic λ, β
134.140° · -2.438°
HTM-20 index
947176015
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