Key parameters at a glance
- A radius of 1.34 Earth radii
- A mass of 2.36 Earth masses
- Surface gravity around 1.31 g
- An orbital period of 112.305 days
- Semi-major axis 0.4090 AU
- Equilibrium temperature 241 K (-32 °C)
- Distance from Earth 1,193.62 light-years
- Earth Similarity Index 0.834
- Travel time at Voyager 1 speed 21,049,431 years
Context from the literature
Kepler-442b is a confirmed near-Earth-sized exoplanet, likely rocky, orbiting within the habitable zone of the K-type main-sequence star Kepler-442, about 1,196 light-years (367 pc) from Earth in the constellation of Lyra.
Excerpted from Wikipedia · full article
Kepler-442 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#1010of 1176
top 85.8%
This planet
1.34R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-442 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.34 | 11.21 |
| Mass (M⊕) | 1.00 | 2.36 | 317.83 |
| Density (g/cm³) | 5.51 | 5.39 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.31 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.66 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120499135
Gaia DR2
Gaia DR2 2100258047339711488
Gaia DR3
Gaia DR3 2100258047339711488
System
Kepler-442
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 112.31 Earth days (30.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4090 AU.
Transit Fingerprint
Depth
0.050 %
Duration
5.620 h
Impact parameter b
0.220
Rp / R★
0.021100
Transit midpoint (BJD)
2,455,849.5578
Photometric dip
Transit produces a flux drop of 502 ppm lasting ≈ 5.62 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021100
Semi-major axis / stellar radius
146.000
Impact parameter (b)
0.220
Transit mid-time (BJD)
2,455,849.5578
Angular separation (arcsec)
1.12000
Eq. Temperature
241K
(-32 °C)
Insolation (S⊕)
0.66
Earth = 1.00
Earth Similarity (ESI)
0.834
0 = alien, 1 = Earth-identical
Within the conservative habitable zone — surface water would be frozen.
Discovery Paper
Primary reference
Torres et al. 2015Instrument
Kepler CCD Array
Publication
2015-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2015 at Kepler (12 shown).
Host System: Kepler-442
Spectral Class
K-type orange
Effective Temperature
4,402 K — cooler than the Sun (5,778 K)
Estimated Age
2.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.598 R☉
Stellar Mass
0.609 M☉
Metallicity [Fe/H]
-0.37
Extended Stellar Properties
Surface gravity (log g)
4.673 dex
Stellar density
4.010 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.704 mas
Total Proper Motion
8.018 mas/yr
PM Right Ascension
7.79 mas/yr
PM Declination
1.92 mas/yr
Galactic Cartesian (pc)
x = 0.205 · y = -0.746 · z = 0.633
Equatorial (J2000)
RA 285.36660° · Dec 39.28007°
Galactic ℓ, b
69.750° · 14.984°
Ecliptic λ, β
295.346° · 61.374°
HTM-20 index
-498384969
Similar Worlds
K2-368 b
Super-Earth · K-type orange
Radius 1.33 R⊕ · 673.9 ly
K2-211 b
Super-Earth · K-type orange
Radius 1.33 R⊕ · 888.1 ly
K2-268 e
Super-Earth · K-type orange
Radius 1.33 R⊕ · 1,069.1 ly
Kepler-935 b
Super-Earth · K-type orange
Radius 1.35 R⊕ · 1,538.7 ly
Kepler-220 e
Super-Earth · K-type orange
Radius 1.33 R⊕ · 558.1 ly
Kepler-1265 b
Super-Earth · K-type orange
Radius 1.35 R⊕ · 1,903.6 ly