Key parameters at a glance
- A radius of 2.27 Earth radii
- A mass of 5.77 Earth masses
- Surface gravity around 1.12 g
- An orbital period of 16.550 days
- Semi-major axis 0.1196 AU
- Equilibrium temperature 656 K (383 °C)
- Distance from Earth 1,998.69 light-years
- Earth Similarity Index 0.400
- Travel time at Voyager 1 speed 35,246,962 years
1 sibling around Kepler-589
Kepler-589 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-589 c | Rocky Terrestrial | 1.12 | 1.45 | 3.525 | 1,098 | 2021 |
| Kepler-589 b this | Sub-Neptune | 2.27 | 5.77 | 16.550 | 656 | 2016 |
Kepler-589 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1554of 1978
top 78.5%
This planet
2.27R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-589 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.27 | 11.21 |
| Mass (M⊕) | 1.00 | 5.77 | 317.83 |
| Density (g/cm³) | 5.51 | 2.71 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.12 | 2.53 |
| Insolation (S⊕) | 1.00 | 32.14 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 123129910
Gaia DR2
Gaia DR2 2119809116425132160
Gaia DR3
Gaia DR3 2119809116425132160
System
Kepler-589
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 16.55 Earth days (4.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1196 AU.
Transit Fingerprint
Depth
0.074 %
Duration
4.004 h
Impact parameter b
0.037
Rp / R★
0.025185
Transit midpoint (BJD)
2,455,004.6942
Photometric dip
Transit produces a flux drop of 745 ppm lasting ≈ 4.00 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025185
Semi-major axis / stellar radius
32.350
Impact parameter (b)
0.037
Transit mid-time (BJD)
2,455,004.6942
Angular separation (arcsec)
0.19500
Eq. Temperature
656K
(383 °C)
Insolation (S⊕)
32.14
Earth = 1.00
Earth Similarity (ESI)
0.400
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
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-589
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,296 K — cooler than the Sun (5,778 K)
Estimated Age
4.47 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.830 R☉
Stellar Mass
0.880 M☉
Metallicity [Fe/H]
0.01
Extended Stellar Properties
Surface gravity (log g)
4.550 dex
Stellar density
2.339 g/cm³
Systemic radial velocity
-18.91 km/s
Rotational v·sin i
3.90 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.603 mas
Total Proper Motion
26.804 mas/yr
PM Right Ascension
8.22 mas/yr
PM Declination
25.51 mas/yr
Galactic Cartesian (pc)
x = 0.124 · y = -0.661 · z = 0.740
Equatorial (J2000)
RA 280.64143° · Dec 47.75206°
Galactic ℓ, b
76.850° · 21.143°
Ecliptic λ, β
291.708° · 70.390°
HTM-20 index
1274122746
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Kepler-166 b
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Kepler-226 c
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