Key parameters at a glance
- A radius of 2.54 Earth radii
- A mass of 6.99 Earth masses
- Surface gravity around 1.08 g
- An orbital period of 19.079 days
- Semi-major axis 0.1229 AU
- Equilibrium temperature 485 K (212 °C)
- Distance from Earth 1,092.51 light-years
- Earth Similarity Index 0.507
- Travel time at Voyager 1 speed 19,266,500 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around K2-16
K2-16 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| EPIC 201754305 d | Rocky Terrestrial | 1.03 | 1.08 | 2.716 | — | 2019 |
| K2-16 b | Sub-Neptune | 2.02 | 4.74 | 7.619 | 658 | 2015 |
| K2-16 c this | Sub-Neptune | 2.54 | 6.99 | 19.079 | 485 | 2015 |
K2-16 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1117of 1978
top 56.4%
This planet
2.54R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-16 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.54 | 11.21 |
| Mass (M⊕) | 1.00 | 6.99 | 317.83 |
| Density (g/cm³) | 5.51 | 2.34 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.08 | 2.53 |
| Insolation (S⊕) | 1.00 | 13.10 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 281886199
Gaia DR2
Gaia DR2 3897048338487064064
Gaia DR3
Gaia DR3 3897048338487064064
System
K2-16
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 19.08 Earth days (5.2% of a terrestrial year) at a mean orbital distance of 0.1229 AU.
Transit Fingerprint
Depth
0.107 %
Duration
3.859 h
Impact parameter b
0.860
Rp / R★
0.035260
Transit midpoint (BJD)
2,456,809.4800
Photometric dip
Transit produces a flux drop of 1,065 ppm lasting ≈ 3.86 h.
Extended Orbital Architecture
Planet / star radius ratio
0.035260
Semi-major axis / stellar radius
22.800
Impact parameter (b)
0.860
Transit mid-time (BJD)
2,456,809.4800
Angular separation (arcsec)
0.36700
Eq. Temperature
485K
(212 °C)
Insolation (S⊕)
13.10
Earth = 1.00
Earth Similarity (ESI)
0.507
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
Montet et al. 2015Instrument
Kepler CCD Array
Publication
2015-08
Observation locale
Space
Discovery cohort
Planets confirmed in 2015 at K2 (12 shown).
Host System: K2-16
Spectral Class
K-type orange
Effective Temperature
4,742 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.660 R☉
Stellar Mass
0.680 M☉
Metallicity [Fe/H]
-0.33
Extended Stellar Properties
Surface gravity (log g)
4.510 dex
Stellar density
2.960 g/cm³
Rotational v·sin i
2.00 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 12 bands
Astrometric Data
Parallax
2.957 mas
Total Proper Motion
22.566 mas/yr
PM Right Ascension
-6.38 mas/yr
PM Declination
21.65 mas/yr
Galactic Cartesian (pc)
x = -0.993 · y = 0.085 · z = 0.079
Equatorial (J2000)
RA 175.09722° · Dec 4.55743°
Galactic ℓ, b
262.912° · 61.777°
Ecliptic λ, β
173.689° · 2.236°
HTM-20 index
1035328883
Similar Worlds
TOI-1648 b
Sub-Neptune · K-type orange
Radius 2.54 R⊕ · 227.8 ly
K2-118 b
Sub-Neptune · K-type orange
Radius 2.54 R⊕ · 1,049.3 ly
Kepler-991 b
Sub-Neptune · K-type orange
Radius 2.54 R⊕ · 1,270.6 ly
K2-119 b
Sub-Neptune · K-type orange
Radius 2.53 R⊕ · 1,192.4 ly
Kepler-156 c
Sub-Neptune · K-type orange
Radius 2.55 R⊕ · 1,446.4 ly
Kepler-577 b
Sub-Neptune · K-type orange
Radius 2.55 R⊕ · 1,709.9 ly