Key parameters at a glance
- A radius of 1.86 Earth radii
- A mass of 4.12 Earth masses
- Surface gravity around 1.19 g
- An orbital period of 101.111 days
- Semi-major axis 0.2420 AU
- Equilibrium temperature 229 K (-44 °C)
- Distance from Earth 981.83 light-years
- Earth Similarity Index 0.723
- Travel time at Voyager 1 speed 17,314,525 years
Context from the literature
Kepler-440b is a confirmed super-Earth exoplanet orbiting within the habitable zone of Kepler-440, about 850 light-years (261 pc) from Earth. The planet was discovered by NASA's Kepler spacecraft using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured. NASA announced the confirmation of the exoplanet on 6 January 2015.
Excerpted from Wikipedia · full article
Kepler-440 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#177of 1176
top 15.0%
This planet
1.86R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-440 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.86 | 11.21 |
| Mass (M⊕) | 1.00 | 4.12 | 317.83 |
| Density (g/cm³) | 5.51 | 3.52 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.19 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.20 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 120495880
Gaia DR2
Gaia DR2 2103871317426712448
Gaia DR3
Gaia DR3 2103871317426712448
System
Kepler-440
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 101.11 Earth days (27.7% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.2420 AU.
Transit Fingerprint
Depth
0.088 %
Duration
7.950 h
Impact parameter b
0.090
Rp / R★
0.030380
Transit midpoint (BJD)
2,455,756.2986
Photometric dip
Transit produces a flux drop of 878 ppm lasting ≈ 7.95 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030380
Semi-major axis / stellar radius
99.000
Impact parameter (b)
0.090
Transit mid-time (BJD)
2,455,756.2986
Angular separation (arcsec)
0.80400
Eq. Temperature
229K
(-44 °C)
Insolation (S⊕)
1.20
Earth = 1.00
Earth Similarity (ESI)
0.723
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-440
Spectral Class
K-type orange
Effective Temperature
4,134 K — cooler than the Sun (5,778 K)
Estimated Age
1.30 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.559 R☉
Stellar Mass
0.575 M☉
Metallicity [Fe/H]
-0.30
Extended Stellar Properties
Surface gravity (log g)
4.706 dex
Stellar density
4.760 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
3.293 mas
Total Proper Motion
32.153 mas/yr
PM Right Ascension
15.30 mas/yr
PM Declination
28.28 mas/yr
Galactic Cartesian (pc)
x = 0.198 · y = -0.723 · z = 0.662
Equatorial (J2000)
RA 285.35007° · Dec 41.45237°
Galactic ℓ, b
71.823° · 15.835°
Ecliptic λ, β
296.390° · 63.492°
HTM-20 index
2129875410
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