Key parameters at a glance
- A radius of 7.72 Earth radii
- A mass of 46.10 Earth masses
- Surface gravity around 0.77 g
- An orbital period of 17.276 days
- Semi-major axis 0.1211 AU
- Equilibrium temperature 538 K (265 °C)
- Distance from Earth 1,205.62 light-years
- Earth Similarity Index 0.283
- Travel time at Voyager 1 speed 21,261,096 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-489 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#163of 574
top 28.2%
This planet
7.72R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-489 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 7.72 | 11.21 |
| Mass (M⊕) | 1.00 | 46.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.55 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.77 | 2.53 |
| Insolation (S⊕) | 1.00 | 20.62 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122607554
Gaia DR2
Gaia DR2 2052616586468670976
Gaia DR3
Gaia DR3 2052616586468670976
System
Kepler-489
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.28 Earth days (4.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1211 AU.
Transit Fingerprint
Depth
1.046 %
Duration
3.943 h
Impact parameter b
0.013
Rp / R★
0.092902
Transit midpoint (BJD)
2,454,966.8392
Photometric dip
Transit produces a flux drop of 10,458 ppm lasting ≈ 3.94 h.
Extended Orbital Architecture
Planet / star radius ratio
0.092902
Semi-major axis / stellar radius
36.582
Impact parameter (b)
0.013
Transit mid-time (BJD)
2,454,966.8392
Angular separation (arcsec)
0.32800
Eq. Temperature
538K
(265 °C)
Insolation (S⊕)
20.62
Earth = 1.00
Earth Similarity (ESI)
0.283
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-489
Spectral Class
K-type orange
Effective Temperature
5,014 K — cooler than the Sun (5,778 K)
Estimated Age
3.31 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.760 R☉
Stellar Mass
0.820 M☉
Metallicity [Fe/H]
0.00
Extended Stellar Properties
Surface gravity (log g)
4.590 dex
Stellar density
3.047 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
2.676 mas
Total Proper Motion
38.014 mas/yr
PM Right Ascension
17.73 mas/yr
PM Declination
-33.63 mas/yr
Galactic Cartesian (pc)
x = 0.280 · y = -0.735 · z = 0.618
Equatorial (J2000)
RA 290.83324° · Dec 38.18419°
Galactic ℓ, b
70.552° · 10.652°
Ecliptic λ, β
303.140° · 59.249°
HTM-20 index
1898724771
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