Key parameters at a glance
- A radius of 2.31 Earth radii
- A mass of 12.50 Earth masses
- Surface gravity around 2.34 g
- An orbital period of 14.092 days
- Semi-major axis 0.1102 AU
- Equilibrium temperature 646 K (373 °C)
- Distance from Earth 586.89 light-years
- Earth Similarity Index 0.424
- Travel time at Voyager 1 speed 10,349,891 years
2 siblings around K2-37
K2-37 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
K2-37 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1486of 1978
top 75.1%
This planet
2.31R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-37 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.31 | 11.21 |
| Mass (M⊕) | 1.00 | 12.50 | 317.83 |
| Density (g/cm³) | 5.51 | 4.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 2.34 | 2.53 |
| Insolation (S⊕) | 1.00 | 41.30 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 12.500 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 68504570
Gaia DR2
Gaia DR2 6049595065740634624
Gaia DR3
Gaia DR3 6049595065740634624
System
K2-37
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.09 Earth days (3.9% of a terrestrial year) at a mean orbital distance of 0.1102 AU.
Transit Fingerprint
Depth
0.089 %
Duration
2.650 h
Impact parameter b
0.760
Rp / R★
0.027100
Transit midpoint (BJD)
2,456,907.2331
Photometric dip
Transit produces a flux drop of 893 ppm lasting ≈ 2.65 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027100
Semi-major axis / stellar radius
34.342
Impact parameter (b)
0.760
Transit mid-time (BJD)
2,456,907.2331
Angular separation (arcsec)
0.61200
Eq. Temperature
646K
(373 °C)
Insolation (S⊕)
41.30
Earth = 1.00
Earth Similarity (ESI)
0.424
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
Sinukoff et al. 2016Instrument
Kepler CCD Array
Publication
2016-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at K2 (12 shown).
Host System: K2-37
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,352 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.809 R☉
Stellar Mass
0.840 M☉
Metallicity [Fe/H]
-0.08
Extended Stellar Properties
Surface gravity (log g)
4.530 dex
Stellar density
1.806 g/cm³
Systemic radial velocity
-0.63 km/s
Rotational v·sin i
1.30 km/s
Activity index (log R'HK)
-4.957
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
5.529 mas
Total Proper Motion
11.345 mas/yr
PM Right Ascension
-11.07 mas/yr
PM Declination
2.46 mas/yr
Galactic Cartesian (pc)
x = -0.406 · y = -0.812 · z = -0.419
Equatorial (J2000)
RA 243.45097° · Dec -24.78705°
Galactic ℓ, b
350.737° · 18.771°
Ecliptic λ, β
246.007° · -3.532°
HTM-20 index
52634739
Similar Worlds
K2-189 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.31 R⊕ · 789.7 ly
Kepler-926 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.31 R⊕ · 3,005.1 ly
Kepler-981 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.31 R⊕ · 2,863.9 ly
Kepler-244 d
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.31 R⊕ · 3,380.6 ly
Kepler-1926 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.31 R⊕ · 2,176.8 ly
TOI-1443 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.30 R⊕ · 279.9 ly