Key parameters at a glance
- A radius of 2.02 Earth radii
- A mass of 4.74 Earth masses
- Surface gravity around 1.16 g
- An orbital period of 7.619 days
- Semi-major axis 0.0667 AU
- Equilibrium temperature 658 K (385 °C)
- Distance from Earth 1,092.51 light-years
- Earth Similarity Index 0.416
- 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 b 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 this | Sub-Neptune | 2.02 | 4.74 | 7.619 | 658 | 2015 |
| K2-16 c | Sub-Neptune | 2.54 | 6.99 | 19.079 | 485 | 2015 |
K2-16 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1927of 1978
top 97.4%
This planet
2.02R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | K2-16 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.02 | 11.21 |
| Mass (M⊕) | 1.00 | 4.74 | 317.83 |
| Density (g/cm³) | 5.51 | 3.16 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.16 | 2.53 |
| Insolation (S⊕) | 1.00 | 44.50 | 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 7.62 Earth days (2.1% of a terrestrial year) at a mean orbital distance of 0.0667 AU.
Transit Fingerprint
Depth
0.104 %
Duration
2.487 h
Impact parameter b
0.680
Rp / R★
0.027960
Transit midpoint (BJD)
2,456,811.6871
Photometric dip
Transit produces a flux drop of 1,041 ppm lasting ≈ 2.49 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027960
Semi-major axis / stellar radius
19.000
Impact parameter (b)
0.680
Transit mid-time (BJD)
2,456,811.6871
Angular separation (arcsec)
0.19900
Eq. Temperature
658K
(385 °C)
Insolation (S⊕)
44.50
Earth = 1.00
Earth Similarity (ESI)
0.416
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
K2-343 c
Sub-Neptune · K-type orange
Radius 2.02 R⊕ · 542.0 ly
Kepler-834 b
Sub-Neptune · K-type orange
Radius 2.02 R⊕ · 2,067.6 ly
K2-62 b
Sub-Neptune · K-type orange
Radius 2.02 R⊕ · 366.8 ly
Kepler-833 b
Sub-Neptune · K-type orange
Radius 2.02 R⊕ · 1,524.4 ly
TOI-544 b
Sub-Neptune · K-type orange
Radius 2.02 R⊕ · 134.1 ly
Kepler-1461 b
Sub-Neptune · K-type orange
Radius 2.03 R⊕ · 2,214.9 ly