Key parameters at a glance
- A radius of 2.05 Earth radii
- A mass of 3.61 Earth masses
- Surface gravity around 0.86 g
- An orbital period of 7.064 days
- Semi-major axis 0.0680 AU
- Equilibrium temperature 769 K (496 °C)
- Distance from Earth 1,417.58 light-years
- Earth Similarity Index 0.304
- Travel time at Voyager 1 speed 24,998,993 years
- Almost certainly tidally locked to its host star given the close orbit
1 sibling around Kepler-161
Kepler-161 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-161 b | Sub-Neptune | 2.12 | 2.63 | 4.921 | 868 | 2014 |
| Kepler-161 c this | Sub-Neptune | 2.05 | 3.61 | 7.064 | 769 | 2014 |
Kepler-161 c Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1888of 1978
top 95.4%
This planet
2.05R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-161 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.05 | 11.21 |
| Mass (M⊕) | 1.00 | 3.61 | 317.83 |
| Density (g/cm³) | 5.51 | 1.31 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.86 | 2.53 |
| Insolation (S⊕) | 1.00 | 76.20 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 3.610 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 159444082
Gaia DR2
Gaia DR2 2102046952760377728
Gaia DR3
Gaia DR3 2102046952760377728
System
Kepler-161
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.06 Earth days (1.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0680 AU.
Transit Fingerprint
Depth
0.073 %
Duration
1.351 h
Impact parameter b
0.200
Rp / R★
0.024226
Transit midpoint (BJD)
2,454,968.3791
Photometric dip
Transit produces a flux drop of 733 ppm lasting ≈ 1.35 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024226
Semi-major axis / stellar radius
39.980
Impact parameter (b)
0.200
Transit mid-time (BJD)
2,454,968.3791
Angular separation (arcsec)
0.15600
Eq. Temperature
769K
(496 °C)
Insolation (S⊕)
76.20
Earth = 1.00
Earth Similarity (ESI)
0.304
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.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-161
Spectral Class
K-type orange
Effective Temperature
5,078 K — cooler than the Sun (5,778 K)
Estimated Age
0.91 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.806 R☉
Stellar Mass
0.853 M☉
Metallicity [Fe/H]
0.24
Extended Stellar Properties
Surface gravity (log g)
4.553 dex
Stellar density
1.870 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.272 mas
Total Proper Motion
11.252 mas/yr
PM Right Ascension
-3.57 mas/yr
PM Declination
10.67 mas/yr
Galactic Cartesian (pc)
x = 0.256 · y = -0.684 · z = 0.683
Equatorial (J2000)
RA 290.51647° · Dec 43.08386°
Galactic ℓ, b
74.956° · 12.995°
Ecliptic λ, β
305.723° · 64.000°
HTM-20 index
856039046
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