Key parameters at a glance
- A radius of 5.77 Earth radii
- A mass of 28.10 Earth masses
- Surface gravity around 0.84 g
- An orbital period of 0.654 days
- Semi-major axis 0.0129 AU
- Equilibrium temperature 1,437 K (1164 °C)
- Distance from Earth 1,982.76 light-years
- Earth Similarity Index 0.116
- Travel time at Voyager 1 speed 34,965,931 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1520 b Planet Profile
Physical Specs
Classification
Planet Type
Neptune-like
Discovery
Size rank in cohort
Rank by radius
#300of 574
top 52.1%
This planet
5.77R⊕
Neptune-like median
6.39R⊕
Nearest-size peers
| Metric | Earth | Kepler-1520 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 5.77 | 11.21 |
| Mass (M⊕) | 1.00 | 28.10 | 317.83 |
| Density (g/cm³) | 5.51 | 0.80 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.84 | 2.53 |
| Insolation (S⊕) | 1.00 | 1,134.39 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 417679385
Gaia DR2
Gaia DR2 2136216647412563840
Gaia DR3
Gaia DR3 2136216647412563840
System
Kepler-1520
Percentile among Neptune-like cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts roughly 15.7 hours long on a nearly circular orbit at a mean orbital distance of 0.0129 AU.
Transit Fingerprint
Depth
0.460 %
Duration
1.540 h
Impact parameter b
0.883
Rp / R★
0.073866
Transit midpoint (BJD)
2,454,965.0592
Photometric dip
Transit produces a flux drop of 4,596 ppm lasting ≈ 1.54 h.
Extended Orbital Architecture
Planet / star radius ratio
0.073866
Semi-major axis / stellar radius
2.199
Impact parameter (b)
0.883
Transit mid-time (BJD)
2,454,965.0592
Angular separation (arcsec)
0.02120
Eq. Temperature
1,437K
(1164 °C)
Insolation (S⊕)
1,134.39
Earth = 1.00
Earth Similarity (ESI)
0.116
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.
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-1520
Spectral Class
K-type orange
Effective Temperature
4,677 K — cooler than the Sun (5,778 K)
Estimated Age
4.47 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.710 R☉
Stellar Mass
0.760 M☉
Metallicity [Fe/H]
0.04
Extended Stellar Properties
Surface gravity (log g)
4.610 dex
Stellar density
0.471 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.617 mas
Total Proper Motion
11.151 mas/yr
PM Right Ascension
0.32 mas/yr
PM Declination
11.15 mas/yr
Galactic Cartesian (pc)
x = 0.223 · y = -0.581 · z = 0.783
Equatorial (J2000)
RA 290.96621° · Dec 51.50477°
Galactic ℓ, b
83.016° · 16.186°
Ecliptic λ, β
315.096° · 71.673°
HTM-20 index
18965547
Similar Worlds
TOI-532 b
Neptune-like · K-type orange
Radius 5.82 R⊕ · 440.5 ly
HD 103197 b
Neptune-like · K-type orange
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HD 127506 b
Neptune-like · K-type orange
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TOI-1410 c
Neptune-like · K-type orange
Radius 5.63 R⊕ · 237.3 ly
TOI-4010 c
Neptune-like · K-type orange
Radius 5.93 R⊕ · 578.9 ly
Kepler-951 b
Neptune-like · K-type orange
Radius 5.59 R⊕ · 1,247.6 ly