Key parameters at a glance
- A radius of 5.14 Earth radii
- A mass of 23.10 Earth masses
- Surface gravity around 0.87 g
- An orbital period of 7.275 days
- Semi-major axis 0.0732 AU
- Equilibrium temperature 833 K (560 °C)
- Distance from Earth 5,956.10 light-years
- Earth Similarity Index 0.224
- Travel time at Voyager 1 speed 105,035,779 years
Kepler-678 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#363of 574
top 63.1%
This planet
5.14R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-678 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.14 | 11.21 |
| Mass (M⊕) | 1.00 | 23.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.94 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.87 | 2.53 |
| Insolation (S⊕) | 1.00 | 113.64 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 27533282
Gaia DR2
Gaia DR2 2135550652604184192
Gaia DR3
Gaia DR3 2135550652604184192
System
Kepler-678
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.28 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0732 AU.
Transit Fingerprint
Depth
0.300 %
Duration
7.521 h
Impact parameter b
0.596
Rp / R★
0.051836
Transit midpoint (BJD)
2,455,002.9949
Photometric dip
Transit produces a flux drop of 3,001 ppm lasting ≈ 7.52 h.
Extended Orbital Architecture
Planet / star radius ratio
0.051836
Semi-major axis / stellar radius
6.400
Impact parameter (b)
0.596
Transit mid-time (BJD)
2,455,002.9949
Angular separation (arcsec)
0.04010
Eq. Temperature
833K
(560 °C)
Insolation (S⊕)
113.64
Earth = 1.00
Earth Similarity (ESI)
0.224
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-678
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,520 K — cooler than the Sun (5,778 K)
Estimated Age
4.47 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.910 R☉
Stellar Mass
0.940 M☉
Metallicity [Fe/H]
0.07
Extended Stellar Properties
Surface gravity (log g)
4.500 dex
Stellar density
0.123 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.519 mas
Total Proper Motion
10.450 mas/yr
PM Right Ascension
-5.55 mas/yr
PM Declination
-8.85 mas/yr
Galactic Cartesian (pc)
x = 0.273 · y = -0.574 · z = 0.772
Equatorial (J2000)
RA 295.45526° · Dec 50.49451°
Galactic ℓ, b
83.312° · 13.200°
Ecliptic λ, β
321.164° · 69.452°
HTM-20 index
-356060059
Similar Worlds
K2-157 d
Neptune-like · G-type yellow (Sun-like)
Radius 5.16 R⊕ · 973.2 ly
HD 74698 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.12 R⊕ · 169.8 ly
61 Vir d
Neptune-like · G-type yellow (Sun-like)
Radius 5.11 R⊕ · 27.7 ly
Kepler-818 b
Neptune-like · G-type yellow (Sun-like)
Radius 5.11 R⊕ · 3,017.1 ly
K2-398 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.10 R⊕ · 1,979.7 ly
TOI-421 c
Neptune-like · G-type yellow (Sun-like)
Radius 5.09 R⊕ · 244.0 ly