Key parameters at a glance
- A radius of 1.64 Earth radii
- A mass of 3.33 Earth masses
- Surface gravity around 1.24 g
- An orbital period of 207.248 days
- Semi-major axis 0.6400 AU
- Equilibrium temperature 189 K (-84 °C)
- Distance from Earth 874.11 light-years
- Earth Similarity Index 0.645
- Travel time at Voyager 1 speed 15,414,891 years
Kepler-441 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#495of 1176
top 42.0%
This planet
1.64R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-441 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.64 | 11.21 |
| Mass (M⊕) | 1.00 | 3.33 | 317.83 |
| Density (g/cm³) | 5.51 | 4.15 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.24 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.21 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 267667567
Gaia DR2
Gaia DR2 2131799084568477056
Gaia DR3
Gaia DR3 2131799084568477056
System
Kepler-441
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 207.25 Earth days (56.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.6400 AU.
Transit Fingerprint
Depth
0.081 %
Duration
6.050 h
Impact parameter b
0.250
Rp / R★
0.028000
Transit midpoint (BJD)
2,455,667.7764
Photometric dip
Transit produces a flux drop of 809 ppm lasting ≈ 6.05 h.
Extended Orbital Architecture
Planet / star radius ratio
0.028000
Semi-major axis / stellar radius
260.000
Impact parameter (b)
0.250
Transit mid-time (BJD)
2,455,667.7764
Angular separation (arcsec)
2.39000
Eq. Temperature
189K
(-84 °C)
Insolation (S⊕)
0.21
Earth = 1.00
Earth Similarity (ESI)
0.645
0 = alien, 1 = Earth-identical
Beyond the outer HZ boundary (too cold) — 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-441
Spectral Class
K-type orange
Effective Temperature
4,340 K — cooler than the Sun (5,778 K)
Estimated Age
1.90 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.550 R☉
Stellar Mass
0.572 M☉
Metallicity [Fe/H]
-0.57
Extended Stellar Properties
Surface gravity (log g)
4.715 dex
Stellar density
4.940 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.703 mas
Total Proper Motion
34.898 mas/yr
PM Right Ascension
6.47 mas/yr
PM Declination
34.29 mas/yr
Galactic Cartesian (pc)
x = 0.165 · y = -0.635 · z = 0.755
Equatorial (J2000)
RA 284.56695° · Dec 49.01271°
Galactic ℓ, b
79.009° · 19.075°
Ecliptic λ, β
300.309° · 70.923°
HTM-20 index
-405406423
Similar Worlds
Kepler-247 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 2,164.7 ly
Kepler-1136 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 1,602.8 ly
Kepler-1206 b
Super-Earth · K-type orange
Radius 1.64 R⊕ · 2,485.4 ly
Kepler-331 d
Super-Earth · K-type orange
Radius 1.64 R⊕ · 1,892.1 ly
K2-148 d
Super-Earth · K-type orange
Radius 1.64 R⊕ · 405.9 ly
Kepler-658 b
Super-Earth · K-type orange
Radius 1.63 R⊕ · 1,266.7 ly