Key parameters at a glance
- A radius of 2.12 Earth radii
- A mass of 2.63 Earth masses
- Surface gravity around 0.59 g
- An orbital period of 4.921 days
- Semi-major axis 0.0540 AU
- Equilibrium temperature 868 K (595 °C)
- Distance from Earth 1,417.58 light-years
- Earth Similarity Index 0.212
- 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 b 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 this | Sub-Neptune | 2.12 | 2.63 | 4.921 | 868 | 2014 |
| Kepler-161 c | Sub-Neptune | 2.05 | 3.61 | 7.064 | 769 | 2014 |
Kepler-161 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1782of 1978
top 90.0%
This planet
2.12R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-161 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.12 | 11.21 |
| Mass (M⊕) | 1.00 | 2.63 | 317.83 |
| Density (g/cm³) | 5.51 | 0.45 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.59 | 2.53 |
| Insolation (S⊕) | 1.00 | 123.40 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2.630 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 4.92 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0540 AU.
Transit Fingerprint
Depth
0.080 %
Duration
1.873 h
Impact parameter b
0.020
Rp / R★
0.024565
Transit midpoint (BJD)
2,455,007.2990
Photometric dip
Transit produces a flux drop of 800 ppm lasting ≈ 1.87 h.
Extended Orbital Architecture
Planet / star radius ratio
0.024565
Semi-major axis / stellar radius
20.480
Impact parameter (b)
0.020
Transit mid-time (BJD)
2,455,007.2990
Angular separation (arcsec)
0.12400
Eq. Temperature
868K
(595 °C)
Insolation (S⊕)
123.40
Earth = 1.00
Earth Similarity (ESI)
0.212
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
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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