Key parameters at a glance
- A radius of 3.20 Earth radii
- A mass of 82.60 Earth masses
- Surface gravity around 8.07 g
- An orbital period of 7.931 days
- Semi-major axis 0.0800 AU
- Equilibrium temperature 899 K (626 °C)
- Distance from Earth 2,409.17 light-years
- Earth Similarity Index 0.232
- Travel time at Voyager 1 speed 42,485,783 years
1 sibling around Kepler-170
Kepler-170 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-170 b this | Sub-Neptune | 3.20 | 82.60 | 7.931 | 899 | 2014 |
| Kepler-170 c | Sub-Neptune | 2.86 | 8.55 | 16.666 | 702 | 2014 |
Kepler-170 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#348of 1978
top 17.5%
This planet
3.20R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-170 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.20 | 11.21 |
| Mass (M⊕) | 1.00 | 82.60 | 317.83 |
| Density (g/cm³) | 5.51 | 13.90 | 1.33 |
| Surface Gravity (g) | 1.00 | 8.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 136.52 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 82.600 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 120253745
Gaia DR2
Gaia DR2 2104098950692667264
Gaia DR3
Gaia DR3 2104098950692667264
System
Kepler-170
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.93 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0800 AU.
Transit Fingerprint
Depth
0.083 %
Duration
3.680 h
Impact parameter b
0.760
Rp / R★
0.030480
Transit midpoint (BJD)
2,455,002.5158
Photometric dip
Transit produces a flux drop of 826 ppm lasting ≈ 3.68 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030480
Semi-major axis / stellar radius
9.500
Impact parameter (b)
0.760
Transit mid-time (BJD)
2,455,002.5158
Angular separation (arcsec)
0.10800
Eq. Temperature
899K
(626 °C)
Insolation (S⊕)
136.52
Earth = 1.00
Earth Similarity (ESI)
0.232
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-170
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,679 K — cooler than the Sun (5,778 K)
Estimated Age
1.58 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.035 R☉
Stellar Mass
1.066 M☉
Metallicity [Fe/H]
0.39
Extended Stellar Properties
Surface gravity (log g)
4.445 dex
Stellar density
1.110 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.325 mas
Total Proper Motion
12.317 mas/yr
PM Right Ascension
2.42 mas/yr
PM Declination
12.08 mas/yr
Galactic Cartesian (pc)
x = 0.187 · y = -0.724 · z = 0.664
Equatorial (J2000)
RA 284.52120° · Dec 41.62966°
Galactic ℓ, b
71.750° · 16.477°
Ecliptic λ, β
295.122° · 63.808°
HTM-20 index
1913896176
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HD 191939 c
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