Key parameters at a glance
- A radius of 2.71 Earth radii
- A mass of 7.80 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 172.705 days
- Semi-major axis 0.5882 AU
- Equilibrium temperature 355 K (82 °C)
- Distance from Earth 1,273.23 light-years
- Earth Similarity Index 0.639
- Travel time at Voyager 1 speed 22,453,378 years
Kepler-540 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#849of 1978
top 42.9%
This planet
2.71R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-540 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.71 | 11.21 |
| Mass (M⊕) | 1.00 | 7.80 | 317.83 |
| Density (g/cm³) | 5.51 | 2.15 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.53 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 159452015
Gaia DR2
Gaia DR2 2127008611187043456
Gaia DR3
Gaia DR3 2127008611187043456
System
Kepler-540
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 172.70 Earth days (47.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5882 AU.
Transit Fingerprint
Depth
0.063 %
Duration
11.279 h
Impact parameter b
0.060
Rp / R★
0.022941
Transit midpoint (BJD)
2,455,069.9234
Photometric dip
Transit produces a flux drop of 630 ppm lasting ≈ 11.28 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022941
Semi-major axis / stellar radius
119.000
Impact parameter (b)
0.060
Transit mid-time (BJD)
2,455,069.9234
Angular separation (arcsec)
1.51000
Eq. Temperature
355K
(82 °C)
Insolation (S⊕)
4.53
Earth = 1.00
Earth Similarity (ESI)
0.639
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Transit timing variations
Gravitational interactions from neighbours have been detected.
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-540
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,946 K — hotter than the Sun (5,778 K)
Estimated Age
4.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
1.080 R☉
Stellar Mass
1.020 M☉
Metallicity [Fe/H]
-0.10
Extended Stellar Properties
Surface gravity (log g)
4.380 dex
Stellar density
0.510 g/cm³
Systemic radial velocity
5.71 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.533 mas
Total Proper Motion
56.460 mas/yr
PM Right Ascension
-39.87 mas/yr
PM Declination
-39.98 mas/yr
Galactic Cartesian (pc)
x = 0.250 · y = -0.663 · z = 0.706
Equatorial (J2000)
RA 290.62500° · Dec 44.87378°
Galactic ℓ, b
76.657° · 13.680°
Ecliptic λ, β
307.281° · 65.665°
HTM-20 index
1500544755
Similar Worlds
Kepler-1230 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 4,449.5 ly
Kepler-478 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 1,369.9 ly
Kepler-233 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 2,793.3 ly
Kepler-294 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 4,426.0 ly
Kepler-1801 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 2,737.5 ly
Kepler-1843 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 2,559.1 ly