Key parameters at a glance
- A radius of 2.13 Earth radii
- A mass of 5.18 Earth masses
- Surface gravity around 1.14 g
- An orbital period of 44.964 days
- Semi-major axis 0.2274 AU
- Equilibrium temperature 379 K (106 °C)
- Distance from Earth 705.65 light-years
- Earth Similarity Index 0.665
- Travel time at Voyager 1 speed 12,444,164 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-942 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1765of 1978
top 89.2%
This planet
2.13R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-942 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.13 | 11.21 |
| Mass (M⊕) | 1.00 | 5.18 | 317.83 |
| Density (g/cm³) | 5.51 | 2.95 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.96 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271349932
Gaia DR2
Gaia DR2 2078316296378319488
Gaia DR3
Gaia DR3 2078316296378319488
System
Kepler-942
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 44.96 Earth days (12.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2274 AU.
Transit Fingerprint
Depth
0.081 %
Duration
5.041 h
Impact parameter b
0.501
Rp / R★
0.026085
Transit midpoint (BJD)
2,454,977.5588
Photometric dip
Transit produces a flux drop of 812 ppm lasting ≈ 5.04 h.
Extended Orbital Architecture
Planet / star radius ratio
0.026085
Semi-major axis / stellar radius
70.290
Impact parameter (b)
0.501
Transit mid-time (BJD)
2,454,977.5588
Angular separation (arcsec)
1.05000
Eq. Temperature
379K
(106 °C)
Insolation (S⊕)
4.96
Earth = 1.00
Earth Similarity (ESI)
0.665
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-942
Spectral Class
K-type orange
Effective Temperature
4,861 K — cooler than the Sun (5,778 K)
Estimated Age
4.17 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.750 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
0.09
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
1.870 g/cm³
Systemic radial velocity
-36.01 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
4.593 mas
Total Proper Motion
25.165 mas/yr
PM Right Ascension
-1.20 mas/yr
PM Declination
25.14 mas/yr
Galactic Cartesian (pc)
x = 0.303 · y = -0.651 · z = 0.697
Equatorial (J2000)
RA 294.95508° · Dec 44.14995°
Galactic ℓ, b
77.391° · 10.591°
Ecliptic λ, β
313.427° · 63.874°
HTM-20 index
-1320980599
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HD 40307 f
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HD 39194 d
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