Key parameters at a glance
- A radius of 5.30 Earth radii
- A mass of 15.00 Earth masses
- Surface gravity around 0.53 g
- An orbital period of 8.992 days
- Semi-major axis 0.0795 AU
- Equilibrium temperature 837 K (564 °C)
- Distance from Earth 514.29 light-years
- Earth Similarity Index 0.201
- Travel time at Voyager 1 speed 9,069,491 years
3 siblings around K2-32
K2-32 b shares its host star with 3 other confirmed planets. Side-by-side measurements below.
K2-32 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#345of 574
top 59.9%
This planet
5.30R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | K2-32 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.30 | 11.21 |
| Mass (M⊕) | 1.00 | 15.00 | 317.83 |
| Density (g/cm³) | 5.51 | 0.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.53 | 2.53 |
| Insolation (S⊕) | 1.00 | 79.50 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 15.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 437444661
Gaia DR2
Gaia DR2 4130539180358512768
Gaia DR3
Gaia DR3 4130539180358512768
System
K2-32
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 8.99 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0795 AU.
Transit Fingerprint
Depth
0.380 %
Duration
3.488 h
Impact parameter b
0.340
Rp / R★
0.056420
Transit midpoint (BJD)
2,456,900.9268
Photometric dip
Transit produces a flux drop of 3,802 ppm lasting ≈ 3.49 h.
Extended Orbital Architecture
Planet / star radius ratio
0.056420
Semi-major axis / stellar radius
19.860
Impact parameter (b)
0.340
RV semi-amplitude (K)
5.220 m/s
Transit mid-time (BJD)
2,456,900.9268
Long. of periastron (ω)
220.00°
Angular separation (arcsec)
0.50400
Eq. Temperature
837K
(564 °C)
Insolation (S⊕)
79.50
Earth = 1.00
Earth Similarity (ESI)
0.201
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
Dai et al. 2016Instrument
Kepler CCD Array
Publication
2016-06
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-32
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,271 K — cooler than the Sun (5,778 K)
Estimated Age
7.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.860 R☉
Stellar Mass
0.830 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.490 dex
Stellar density
1.833 g/cm³
Systemic radial velocity
-2.20 km/s
Rotational v·sin i
0.70 km/s
Activity index (log R'HK)
-5.061
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
6.314 mas
Total Proper Motion
56.149 mas/yr
PM Right Ascension
-16.60 mas/yr
PM Declination
-53.64 mas/yr
Galactic Cartesian (pc)
x = -0.285 · y = -0.898 · z = -0.335
Equatorial (J2000)
RA 252.42601° · Dec -19.54305°
Galactic ℓ, b
0.546° · 15.802°
Ecliptic λ, β
253.443° · 2.892°
HTM-20 index
1677871432
Similar Worlds
Kepler-396 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.30 R⊕ · 729.8 ly
Kepler-281 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.31 R⊕ · 5,692.9 ly
Kepler-100 e
Neptune-like · G-type yellow (Sun-like)
Radius 5.27 R⊕ · 993.6 ly
HD 109271 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.27 R⊕ · 182.2 ly
K2-108 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.33 R⊕ · 1,556.7 ly
TOI-2019 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.33 R⊕ · 645.8 ly