Key parameters at a glance
- A radius of 1.13 Earth radii
- A mass of 2.23 Earth masses
- Surface gravity around 1.75 g
- An orbital period of 34.169 days
- Semi-major axis 0.1992 AU
- Equilibrium temperature 475 K (202 °C)
- Distance from Earth 1,635.91 light-years
- Earth Similarity Index 0.592
- Travel time at Voyager 1 speed 28,849,336 years
3 siblings around Kepler-324
KOI-1831 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-324 b | Rocky Terrestrial | 1.14 | 2,414.40 | 4.385 | 935 | 2014 |
| Kepler-324 e | Sub-Neptune | 2.04 | 235.01 | 13.979 | 635 | 2021 |
| KOI-1831 d this | Rocky Terrestrial | 1.13 | 2.23 | 34.169 | 475 | 2021 |
| Kepler-324 c | Sub-Neptune | 3.15 | 6.20 | 51.806 | 410 | 2014 |
KOI-1831 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#180of 570
top 31.4%
This planet
1.13R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | KOI-1831 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.13 | 11.21 |
| Mass (M⊕) | 1.00 | 2.23 | 317.83 |
| Density (g/cm³) | 5.51 | 9.95 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.75 | 2.53 |
| Insolation (S⊕) | 1.00 | 11.80 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 2.230 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 243271716
Gaia DR2
Gaia DR2 2132078120004385152
Gaia DR3
Gaia DR3 2132078120004385152
System
Kepler-324
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 34.17 Earth days (9.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1992 AU.
Transit Fingerprint
Depth
0.020 %
Duration
4.487 h
Impact parameter b
0.319
Rp / R★
0.012235
Transit midpoint (BJD)
2,454,981.8051
Photometric dip
Transit produces a flux drop of 204 ppm lasting ≈ 4.49 h.
Extended Orbital Architecture
Planet / star radius ratio
0.012235
Semi-major axis / stellar radius
48.562
Impact parameter (b)
0.319
Transit mid-time (BJD)
2,454,981.8051
Angular separation (arcsec)
0.39700
Eq. Temperature
475K
(202 °C)
Insolation (S⊕)
11.80
Earth = 1.00
Earth Similarity (ESI)
0.592
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
Ofir et al. 2018Instrument
Kepler CCD Array
Publication
2018-01
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-324
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
5,233 K — cooler than the Sun (5,778 K)
Estimated Age
3.39 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.835 R☉
Stellar Mass
0.901 M☉
Metallicity [Fe/H]
0.18
Extended Stellar Properties
Surface gravity (log g)
4.540 dex
Stellar density
1.852 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.965 mas
Total Proper Motion
22.463 mas/yr
PM Right Ascension
-2.20 mas/yr
PM Declination
22.36 mas/yr
Galactic Cartesian (pc)
x = 0.184 · y = -0.621 · z = 0.762
Equatorial (J2000)
RA 286.47145° · Dec 49.64909°
Galactic ℓ, b
80.093° · 18.132°
Ecliptic λ, β
304.556° · 71.118°
HTM-20 index
349022935
Similar Worlds
Kepler-384 c
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.13 R⊕ · 2,921.3 ly
Kepler-1860 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.14 R⊕ · 1,430.9 ly
Kepler-1082 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.12 R⊕ · 2,412.1 ly
Kepler-334 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.12 R⊕ · 1,391.3 ly
Kepler-756 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.12 R⊕ · 2,778.8 ly
Kepler-806 b
Rocky Terrestrial · G-type yellow (Sun-like)
Radius 1.14 R⊕ · 1,180.3 ly