Key parameters at a glance
- A radius of 1.59 Earth radii
- A mass of 3.15 Earth masses
- Surface gravity around 1.25 g
- An orbital period of 3.932 days
- Semi-major axis 0.0444 AU
- Equilibrium temperature 894 K (621 °C)
- Distance from Earth 1,659.51 light-years
- Earth Similarity Index 0.331
- Travel time at Voyager 1 speed 29,265,476 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-928 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#588of 1176
top 49.9%
This planet
1.59R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-928 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.59 | 11.21 |
| Mass (M⊕) | 1.00 | 3.15 | 317.83 |
| Density (g/cm³) | 5.51 | 4.31 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.25 | 2.53 |
| Insolation (S⊕) | 1.00 | 111.11 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122136712
Gaia DR2
Gaia DR2 2101473385648356608
Gaia DR3
Gaia DR3 2101473385648356608
System
Kepler-928
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.93 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0444 AU.
Transit Fingerprint
Depth
0.046 %
Duration
2.198 h
Impact parameter b
0.416
Rp / R★
0.021127
Transit midpoint (BJD)
2,454,965.5547
Photometric dip
Transit produces a flux drop of 456 ppm lasting ≈ 2.20 h.
Extended Orbital Architecture
Planet / star radius ratio
0.021127
Semi-major axis / stellar radius
12.240
Impact parameter (b)
0.416
Transit mid-time (BJD)
2,454,965.5547
Angular separation (arcsec)
0.08730
Eq. Temperature
894K
(621 °C)
Insolation (S⊕)
111.11
Earth = 1.00
Earth Similarity (ESI)
0.331
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-928
Spectral Class
K-type orange
Effective Temperature
4,700 K — cooler than the Sun (5,778 K)
Estimated Age
4.37 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.700 R☉
Stellar Mass
0.730 M☉
Metallicity [Fe/H]
-0.11
Extended Stellar Properties
Surface gravity (log g)
4.620 dex
Stellar density
2.241 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.937 mas
Total Proper Motion
14.956 mas/yr
PM Right Ascension
-7.09 mas/yr
PM Declination
-13.17 mas/yr
Galactic Cartesian (pc)
x = 0.255 · y = -0.704 · z = 0.663
Equatorial (J2000)
RA 289.92068° · Dec 41.54278°
Galactic ℓ, b
73.333° · 12.739°
Ecliptic λ, β
303.735° · 62.668°
HTM-20 index
-1593771934
Similar Worlds
K2-50 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 839.7 ly
Kepler-55 d
Super-Earth · K-type orange
Radius 1.59 R⊕ · 1,887.8 ly
Kepler-55 f
Super-Earth · K-type orange
Radius 1.59 R⊕ · 1,887.8 ly
K2-344 b
Super-Earth · K-type orange
Radius 1.59 R⊕ · 245.2 ly
Kepler-1804 b
Super-Earth · K-type orange
Radius 1.60 R⊕ · 1,417.0 ly
EPIC 212499991 b
Super-Earth · K-type orange
Radius 1.60 R⊕ · 924.0 ly