Key parameters at a glance
- A radius of 1.93 Earth radii
- A mass of 4.38 Earth masses
- Surface gravity around 1.18 g
- An orbital period of 25.942 days
- Semi-major axis 0.1650 AU
- Equilibrium temperature 501 K (228 °C)
- Distance from Earth 2,581.93 light-years
- Earth Similarity Index 0.545
- Travel time at Voyager 1 speed 45,532,376 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-878 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#85of 1176
top 7.1%
This planet
1.93R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-878 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.93 | 11.21 |
| Mass (M⊕) | 1.00 | 4.38 | 317.83 |
| Density (g/cm³) | 5.51 | 3.35 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.18 | 2.53 |
| Insolation (S⊕) | 1.00 | 27.01 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 164892142
Gaia DR2
Gaia DR2 2107313098057987712
Gaia DR3
Gaia DR3 2107313098057987712
System
Kepler-878
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 25.94 Earth days (7.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1650 AU.
Transit Fingerprint
Depth
0.057 %
Duration
4.044 h
Impact parameter b
0.128
Rp / R★
0.022504
Transit midpoint (BJD)
2,454,989.1860
Photometric dip
Transit produces a flux drop of 570 ppm lasting ≈ 4.04 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022504
Semi-major axis / stellar radius
49.720
Impact parameter (b)
0.128
Transit mid-time (BJD)
2,454,989.1860
Angular separation (arcsec)
0.20800
Eq. Temperature
501K
(228 °C)
Insolation (S⊕)
27.01
Earth = 1.00
Earth Similarity (ESI)
0.545
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-878
Spectral Class
K-type orange
Effective Temperature
5,044 K — cooler than the Sun (5,778 K)
Estimated Age
4.57 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.770 R☉
Stellar Mass
0.810 M☉
Metallicity [Fe/H]
-0.03
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
3.454 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.237 mas
Total Proper Motion
10.039 mas/yr
PM Right Ascension
5.99 mas/yr
PM Declination
8.06 mas/yr
Galactic Cartesian (pc)
x = 0.181 · y = -0.663 · z = 0.727
Equatorial (J2000)
RA 285.29626° · Dec 46.60345°
Galactic ℓ, b
76.808° · 17.778°
Ecliptic λ, β
299.601° · 68.476°
HTM-20 index
-1421996221
Similar Worlds
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