Key parameters at a glance
- A radius of 2.21 Earth radii
- A mass of 5.52 Earth masses
- Surface gravity around 1.13 g
- An orbital period of 7.964 days
- Semi-major axis 0.0734 AU
- Equilibrium temperature 805 K (532 °C)
- Distance from Earth 1,604.62 light-years
- Earth Similarity Index 0.329
- Travel time at Voyager 1 speed 28,297,397 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-989 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1658of 1978
top 83.8%
This planet
2.21R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-989 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.21 | 11.21 |
| Mass (M⊕) | 1.00 | 5.52 | 317.83 |
| Density (g/cm³) | 5.51 | 2.81 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.13 | 2.53 |
| Insolation (S⊕) | 1.00 | 74.35 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123357893
Gaia DR2
Gaia DR2 2119584163218439040
Gaia DR3
Gaia DR3 2119584163218439040
System
Kepler-989
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 7.96 Earth days (2.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0734 AU.
Transit Fingerprint
Depth
0.075 %
Duration
1.498 h
Impact parameter b
0.189
Rp / R★
0.025748
Transit midpoint (BJD)
2,454,969.8167
Photometric dip
Transit produces a flux drop of 746 ppm lasting ≈ 1.50 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025748
Semi-major axis / stellar radius
40.640
Impact parameter (b)
0.189
Transit mid-time (BJD)
2,454,969.8167
Angular separation (arcsec)
0.14900
Eq. Temperature
805K
(532 °C)
Insolation (S⊕)
74.35
Earth = 1.00
Earth Similarity (ESI)
0.329
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-989
Spectral Class
K-type orange
Effective Temperature
5,074 K — cooler than the Sun (5,778 K)
Estimated Age
4.68 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.780 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.580 dex
Stellar density
18.999 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.004 mas
Total Proper Motion
41.396 mas/yr
PM Right Ascension
-17.10 mas/yr
PM Declination
-37.70 mas/yr
Galactic Cartesian (pc)
x = 0.136 · y = -0.665 · z = 0.734
Equatorial (J2000)
RA 281.58280° · Dec 47.23347°
Galactic ℓ, b
76.532° · 20.378°
Ecliptic λ, β
293.184° · 69.742°
HTM-20 index
1739513398
Similar Worlds
Kepler-55 c
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,887.8 ly
Kepler-1026 b
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,145.6 ly
K2-275 c
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 402.6 ly
Kepler-1874 b
Sub-Neptune · K-type orange
Radius 2.21 R⊕ · 1,330.7 ly
Kepler-169 e
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 1,325.9 ly
Kepler-229 b
Sub-Neptune · K-type orange
Radius 2.20 R⊕ · 2,694.9 ly