Key parameters at a glance
- A radius of 2.65 Earth radii
- A mass of 7.50 Earth masses
- Surface gravity around 1.07 g
- An orbital period of 14.101 days
- Equilibrium temperature 629 K (356 °C)
- Distance from Earth 438.98 light-years
- Earth Similarity Index 0.393
- Travel time at Voyager 1 speed 7,741,352 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around K2-165
K2-165 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
K2-165 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#956of 1978
top 48.3%
This planet
2.65R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-165 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.65 | 11.21 |
| Mass (M⊕) | 1.00 | 7.50 | 317.83 |
| Density (g/cm³) | 5.51 | 2.22 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 37.08 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 149969625
Gaia DR2
Gaia DR2 3700016198387202304
Gaia DR3
Gaia DR3 3700016198387202304
System
K2-165
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 14.10 Earth days (3.9% of a terrestrial year).
Transit Fingerprint
Depth
0.145 %
Duration
2.708 h
Rp / R★
0.030202
Transit midpoint (BJD)
2,457,586.7581
Photometric dip
Transit produces a flux drop of 1,451 ppm lasting ≈ 2.71 h.
Eq. Temperature
629K
(356 °C)
Insolation (S⊕)
37.08
Earth = 1.00
Earth Similarity (ESI)
0.393
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.
Discovery Paper
Primary reference
Mayo et al. 2018Instrument
Kepler CCD Array
Publication
2018-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at K2 (12 shown).
Host System: K2-165
Spectral Class
K-type orange
Effective Temperature
5,185 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.804 R☉
Stellar Mass
0.835 M☉
Metallicity [Fe/H]
-0.05
Extended Stellar Properties
Surface gravity (log g)
4.460 dex
Stellar density
2.082 g/cm³
Systemic radial velocity
-0.30 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
7.402 mas
Total Proper Motion
32.614 mas/yr
PM Right Ascension
29.17 mas/yr
PM Declination
-14.59 mas/yr
Galactic Cartesian (pc)
x = -0.996 · y = -0.085 · z = 0.017
Equatorial (J2000)
RA 184.90049° · Dec 0.96833°
Galactic ℓ, b
285.334° · 62.747°
Ecliptic λ, β
184.110° · 2.836°
HTM-20 index
-1989834815
Similar Worlds
Kepler-1822 b
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 2,927.6 ly
HD 39194 c
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 86.1 ly
TOI-277 b
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 210.9 ly
K2-212 b
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 356.2 ly
TOI-1064 c
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 222.0 ly
Kepler-721 b
Sub-Neptune · K-type orange
Radius 2.64 R⊕ · 3,022.2 ly