Key parameters at a glance
- A radius of 2.71 Earth radii
- A mass of 7.78 Earth masses
- Surface gravity around 1.06 g
- An orbital period of 6.546 days
- Semi-major axis 0.0658 AU
- Equilibrium temperature 810 K (537 °C)
- Distance from Earth 3,406.24 light-years
- Earth Similarity Index 0.303
- Travel time at Voyager 1 speed 60,069,088 years
2 siblings around Kepler-27
Kepler-27 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-27 d this | Sub-Neptune | 2.71 | 7.78 | 6.546 | 810 | 2021 |
| Kepler-27 b | Neptune-like | 4.00 | 2,895.31 | 15.335 | 610 | 2011 |
| Kepler-27 c | Neptune-like | 4.90 | 4,385.87 | 31.331 | 481 | 2011 |
Kepler-27 d Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#860of 1978
top 43.4%
This planet
2.71R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-27 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.71 | 11.21 |
| Mass (M⊕) | 1.00 | 7.78 | 317.83 |
| Density (g/cm³) | 5.51 | 2.16 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.06 | 2.53 |
| Insolation (S⊕) | 1.00 | 88.20 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 137556626
Gaia DR2
Gaia DR2 2053586321364864640
Gaia DR3
Gaia DR3 2053586321364864640
System
Kepler-27
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.55 Earth days (1.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0658 AU.
Transit Fingerprint
Depth
0.080 %
Duration
2.993 h
Impact parameter b
0.804
Rp / R★
0.027920
Transit midpoint (BJD)
2,454,966.8587
Photometric dip
Transit produces a flux drop of 803 ppm lasting ≈ 2.99 h.
Extended Orbital Architecture
Planet / star radius ratio
0.027920
Semi-major axis / stellar radius
10.900
Impact parameter (b)
0.804
Transit mid-time (BJD)
2,454,966.8587
Angular separation (arcsec)
0.06300
Eq. Temperature
810K
(537 °C)
Insolation (S⊕)
88.20
Earth = 1.00
Earth Similarity (ESI)
0.303
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Discovery Paper
Primary reference
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-27
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,251 K — cooler than the Sun (5,778 K)
Estimated Age
1.62 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.817 R☉
Stellar Mass
0.926 M☉
Metallicity [Fe/H]
0.21
Extended Stellar Properties
Surface gravity (log g)
4.581 dex
Stellar density
1.351 g/cm³
Rotational v·sin i
0.60 km/s
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.930 mas
Total Proper Motion
2.273 mas/yr
PM Right Ascension
2.25 mas/yr
PM Declination
-0.33 mas/yr
Galactic Cartesian (pc)
x = 0.285 · y = -0.698 · z = 0.657
Equatorial (J2000)
RA 292.23676° · Dec 41.08587°
Galactic ℓ, b
73.687° · 10.974°
Ecliptic λ, β
306.984° · 61.700°
HTM-20 index
1762945600
Similar Worlds
Kepler-1785 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.70 R⊕ · 2,432.3 ly
Kepler-1843 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 2,559.1 ly
Kepler-1801 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.71 R⊕ · 2,737.5 ly
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