Key parameters at a glance
- A radius of 2.66 Earth radii
- A mass of 7.56 Earth masses
- Surface gravity around 1.07 g
- An orbital period of 5.645 days
- Semi-major axis 0.0571 AU
- Equilibrium temperature 744 K (471 °C)
- Distance from Earth 1,942.86 light-years
- Earth Similarity Index 0.333
- Travel time at Voyager 1 speed 34,262,261 years
- Almost certainly tidally locked to its host star given the close orbit
3 siblings around Kepler-1987
Kepler-1987 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-1987 b | Rocky Terrestrial | 1.23 | 2.04 | 2.346 | 997 | 2023 |
| Kepler-1987 c | Super-Earth | 1.33 | 2.33 | 3.648 | 860 | 2023 |
| Kepler-1987 d this | Sub-Neptune | 2.66 | 7.56 | 5.645 | 744 | 2023 |
| Kepler-1987 e | Super-Earth | 1.92 | 4.35 | 8.743 | 643 | 2023 |
Kepler-1987 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#928of 1978
top 46.9%
This planet
2.66R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1987 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.66 | 11.21 |
| Mass (M⊕) | 1.00 | 7.56 | 317.83 |
| Density (g/cm³) | 5.51 | 2.21 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.07 | 2.53 |
| Insolation (S⊕) | 1.00 | 72.38 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 271958892
Gaia DR2
Gaia DR2 2078000289864478976
Gaia DR3
Gaia DR3 2078000289864478976
System
Kepler-1987
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.64 Earth days (1.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0571 AU.
Transit Fingerprint
Depth
0.140 %
Duration
2.260 h
Impact parameter b
0.445
Rp / R★
0.034110
Transit midpoint (BJD)
2,455,189.7370
Photometric dip
Transit produces a flux drop of 1,398 ppm lasting ≈ 2.26 h.
Extended Orbital Architecture
Planet / star radius ratio
0.034110
Semi-major axis / stellar radius
17.830
Impact parameter (b)
0.445
Transit mid-time (BJD)
2,455,189.7370
Angular separation (arcsec)
0.09590
Eq. Temperature
744K
(471 °C)
Insolation (S⊕)
72.38
Earth = 1.00
Earth Similarity (ESI)
0.333
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
Valizadegan et al. 2023Instrument
Kepler CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Kepler (12 shown).
Host System: Kepler-1987
Spectral Class
K-type orange
Effective Temperature
4,769 K — cooler than the Sun (5,778 K)
Estimated Age
—
Stellar Radius
0.714 R☉
Stellar Mass
0.799 M☉
Metallicity [Fe/H]
0.12
Extended Stellar Properties
Surface gravity (log g)
4.622 dex
Stellar density
3.364 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 11 bands
Astrometric Data
Parallax
1.651 mas
Total Proper Motion
8.700 mas/yr
PM Right Ascension
-7.71 mas/yr
PM Declination
-4.04 mas/yr
Galactic Cartesian (pc)
x = 0.319 · y = -0.659 · z = 0.681
Equatorial (J2000)
RA 295.82547° · Dec 42.94337°
Galactic ℓ, b
76.612° · 9.467°
Ecliptic λ, β
313.709° · 62.518°
HTM-20 index
-1587338097
Similar Worlds
Kepler-1110 b
Sub-Neptune · K-type orange
Radius 2.66 R⊕ · 2,370.6 ly
Kepler-196 d
Sub-Neptune · K-type orange
Radius 2.66 R⊕ · 1,472.0 ly
TOI-1064 c
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 222.0 ly
Kepler-357 c
Sub-Neptune · K-type orange
Radius 2.67 R⊕ · 2,245.8 ly
K2-348 c
Sub-Neptune · K-type orange
Radius 2.67 R⊕ · 658.4 ly
HD 39194 c
Sub-Neptune · K-type orange
Radius 2.65 R⊕ · 86.1 ly