Key parameters at a glance
- A radius of 2.70 Earth radii
- A mass of 7.75 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 133.304 days
- Semi-major axis 0.4765 AU
- Equilibrium temperature 301 K (28 °C)
- Distance from Earth 2,440.71 light-years
- Earth Similarity Index 0.723
- Travel time at Voyager 1 speed 43,041,921 years
Kepler-1539 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#865of 1978
top 43.7%
This planet
2.70R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1539 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.70 | 11.21 |
| Mass (M⊕) | 1.00 | 7.75 | 317.83 |
| Density (g/cm³) | 5.51 | 2.16 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 1.57 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 164671591
Gaia DR2
Gaia DR2 2106618687745888768
Gaia DR3
Gaia DR3 2106618687745888768
System
Kepler-1539
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 133.30 Earth days (36.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4765 AU.
Transit Fingerprint
Depth
0.120 %
Duration
7.416 h
Impact parameter b
0.004
Rp / R★
0.030999
Transit midpoint (BJD)
2,455,000.7559
Photometric dip
Transit produces a flux drop of 1,199 ppm lasting ≈ 7.42 h.
Extended Orbital Architecture
Planet / star radius ratio
0.030999
Semi-major axis / stellar radius
141.600
Impact parameter (b)
0.004
Transit mid-time (BJD)
2,455,000.7559
Angular separation (arcsec)
0.63700
Eq. Temperature
301K
(28 °C)
Insolation (S⊕)
1.57
Earth = 1.00
Earth Similarity (ESI)
0.723
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
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-1539
Spectral Class
K-type orange
Effective Temperature
5,176 K — cooler than the Sun (5,778 K)
Estimated Age
4.79 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.800 R☉
Stellar Mass
0.840 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.570 dex
Stellar density
3.022 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.308 mas
Total Proper Motion
7.554 mas/yr
PM Right Ascension
0.06 mas/yr
PM Declination
-7.55 mas/yr
Galactic Cartesian (pc)
x = 0.176 · y = -0.694 · z = 0.698
Equatorial (J2000)
RA 284.21946° · Dec 44.26851°
Galactic ℓ, b
74.235° · 17.648°
Ecliptic λ, β
296.086° · 66.425°
HTM-20 index
1029003331
Similar Worlds
Kepler-290 c
Sub-Neptune · K-type orange
Radius 2.70 R⊕ · 2,265.6 ly
TOI-712 c
Sub-Neptune · K-type orange
Radius 2.70 R⊕ · 191.2 ly
TOI-178 d
Sub-Neptune · K-type orange
Radius 2.70 R⊕ · 204.5 ly
TOI-4504 b
Sub-Neptune · K-type orange
Radius 2.69 R⊕ · 1,117.4 ly
Kepler-417 c
Sub-Neptune · K-type orange
Radius 2.69 R⊕ · 3,176.7 ly
EPIC 212737443 c
Sub-Neptune · K-type orange
Radius 2.69 R⊕ · 1,096.7 ly