Key parameters at a glance
- A radius of 1.51 Earth radii
- A mass of 2.89 Earth masses
- Surface gravity around 1.27 g
- An orbital period of 3.244 days
- Semi-major axis 0.0410 AU
- Equilibrium temperature 1,047 K (774 °C)
- Distance from Earth 2,663.26 light-years
- Earth Similarity Index 0.283
- Travel time at Voyager 1 speed 46,966,520 years
1 sibling around Kepler-389
Kepler-389 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-389 b this | Super-Earth | 1.51 | 2.89 | 3.244 | 1,047 | 2014 |
| Kepler-389 c | Super-Earth | 1.46 | 2.73 | 14.511 | 636 | 2014 |
Kepler-389 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#730of 1176
top 62.0%
This planet
1.51R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-389 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.51 | 11.21 |
| Mass (M⊕) | 1.00 | 2.89 | 317.83 |
| Density (g/cm³) | 5.51 | 4.61 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.27 | 2.53 |
| Insolation (S⊕) | 1.00 | 167.06 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 63074796
Gaia DR2
Gaia DR2 2126597569938248064
Gaia DR3
Gaia DR3 2126597569938248064
System
Kepler-389
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 3.24 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0410 AU.
Transit Fingerprint
Depth
0.037 %
Duration
2.094 h
Impact parameter b
0.250
Rp / R★
0.018432
Transit midpoint (BJD)
2,454,965.9441
Photometric dip
Transit produces a flux drop of 372 ppm lasting ≈ 2.09 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018432
Semi-major axis / stellar radius
5.900
Impact parameter (b)
0.250
Transit mid-time (BJD)
2,454,965.9441
Angular separation (arcsec)
0.05020
Eq. Temperature
1,047K
(774 °C)
Insolation (S⊕)
167.06
Earth = 1.00
Earth Similarity (ESI)
0.283
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.
Discovery Paper
Primary reference
Rowe et al. 2014Instrument
Kepler CCD Array
Publication
2014-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2014 at Kepler (12 shown).
Host System: Kepler-389
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,376 K — cooler than the Sun (5,778 K)
Estimated Age
1.86 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.792 R☉
Stellar Mass
0.765 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.570 dex
Stellar density
2.140 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.197 mas
Total Proper Motion
6.635 mas/yr
PM Right Ascension
1.95 mas/yr
PM Declination
6.34 mas/yr
Galactic Cartesian (pc)
x = 0.265 · y = -0.657 · z = 0.706
Equatorial (J2000)
RA 291.96001° · Dec 44.90006°
Galactic ℓ, b
77.096° · 12.836°
Ecliptic λ, β
309.442° · 65.360°
HTM-20 index
543356121
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