Key parameters at a glance
- A radius of 0.89 Earth radii
- A mass of 0.64 Earth masses
- Surface gravity around 0.81 g
- An orbital period of 6.209 days
- Semi-major axis 0.0610 AU
- Equilibrium temperature 914 K (641 °C)
- Distance from Earth 1,911.72 light-years
- Earth Similarity Index 0.345
- Travel time at Voyager 1 speed 33,713,198 years
1 sibling around Kepler-865
Kepler-865 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.
| Planet | Type | Radius (R⊕) | Mass (M⊕) | Period (d) | Eq. T (K) | Year |
|---|---|---|---|---|---|---|
| Kepler-865 c this | Rocky Terrestrial | 0.89 | 0.64 | 6.209 | 914 | 2023 |
| Kepler-865 b | Sub-Neptune | 2.49 | 6.76 | 14.164 | 694 | 2016 |
Kepler-865 c Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#418of 570
top 73.2%
This planet
0.89R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-865 c | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 0.89 | 11.21 |
| Mass (M⊕) | 1.00 | 0.64 | 317.83 |
| Density (g/cm³) | 5.51 | 4.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 0.81 | 2.53 |
| Insolation (S⊕) | 1.00 | 164.98 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 273499989
Gaia DR2
Gaia DR2 2078648211455026432
Gaia DR3
Gaia DR3 2078648211455026432
System
Kepler-865
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 6.21 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0610 AU.
Transit Fingerprint
Depth
0.010 %
Duration
2.637 h
Impact parameter b
0.272
Rp / R★
0.009191
Transit midpoint (BJD)
2,454,969.8794
Photometric dip
Transit produces a flux drop of 102 ppm lasting ≈ 2.64 h.
Extended Orbital Architecture
Planet / star radius ratio
0.009191
Semi-major axis / stellar radius
17.490
Impact parameter (b)
0.272
Transit mid-time (BJD)
2,454,969.8794
Angular separation (arcsec)
0.10400
Eq. Temperature
914K
(641 °C)
Insolation (S⊕)
164.98
Earth = 1.00
Earth Similarity (ESI)
0.345
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. 2023Instrument
Kepler CCD Array
Publication
2023-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2023 at Kepler (12 shown).
Host System: Kepler-865
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,440 K — cooler than the Sun (5,778 K)
Estimated Age
4.27 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.885 R☉
Stellar Mass
0.782 M☉
Metallicity [Fe/H]
-0.24
Extended Stellar Properties
Surface gravity (log g)
4.438 dex
Stellar density
2.626 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.678 mas
Total Proper Motion
36.819 mas/yr
PM Right Ascension
-8.18 mas/yr
PM Declination
-35.90 mas/yr
Galactic Cartesian (pc)
x = 0.337 · y = -0.642 · z = 0.689
Equatorial (J2000)
RA 297.72423° · Dec 43.52728°
Galactic ℓ, b
77.808° · 8.540°
Ecliptic λ, β
316.964° · 62.519°
HTM-20 index
2111452762
Similar Worlds
Kepler-1637 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.89 R⊕ · 1,849.9 ly
Kepler-780 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.89 R⊕ · 1,818.8 ly
Kepler-1173 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.89 R⊕ · 1,229.8 ly
Kepler-1560 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.89 R⊕ · 1,638.9 ly
Kepler-387 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.89 R⊕ · 2,612.7 ly
K2-223 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 0.89 R⊕ · 647.8 ly