Key parameters at a glance
- A radius of 1.22 Earth radii
- A mass of 1.98 Earth masses
- Surface gravity around 1.33 g
- An orbital period of 4.729 days
- Semi-major axis 0.0468 AU
- Equilibrium temperature 669 K (396 °C)
- Distance from Earth 1,772.48 light-years
- Earth Similarity Index 0.469
- Travel time at Voyager 1 speed 31,257,599 years
- Almost certainly tidally locked to its host star given the close orbit
2 siblings around Kepler-1669
Kepler-1669 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-1669 c | Super-Earth | 1.90 | 4.27 | 1.609 | 958 | 2021 |
| Kepler-1669 d this | Rocky Terrestrial | 1.22 | 1.98 | 4.729 | 669 | 2023 |
| Kepler-1669 b | Sub-Neptune | 2.78 | 8.15 | 9.512 | 530 | 2020 |
Kepler-1669 d Planet Profile
Physical Specs
Classification
Planet Type
Rocky Terrestrial
Discovery
Size rank in cohort
Rank by radius
#35of 570
top 6.0%
This planet
1.22R⊕
Rocky Terrestrial median
1.01R⊕
Nearest-size peers
| Metric | Earth | Kepler-1669 d | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.22 | 11.21 |
| Mass (M⊕) | 1.00 | 1.98 | 317.83 |
| Density (g/cm³) | 5.51 | 5.99 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.33 | 2.53 |
| Insolation (S⊕) | 1.00 | 47.30 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 169457234
Gaia DR2
Gaia DR2 2073652546016392448
Gaia DR3
Gaia DR3 2073652546016392448
System
Kepler-1669
Percentile among Rocky Terrestrial cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 4.73 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0468 AU.
Transit Fingerprint
Depth
0.043 %
Duration
2.234 h
Impact parameter b
0.236
Rp / R★
0.018507
Transit midpoint (BJD)
2,454,965.9387
Photometric dip
Transit produces a flux drop of 434 ppm lasting ≈ 2.23 h.
Extended Orbital Architecture
Planet / star radius ratio
0.018507
Semi-major axis / stellar radius
16.040
Impact parameter (b)
0.236
Transit mid-time (BJD)
2,454,965.9387
Angular separation (arcsec)
0.08610
Eq. Temperature
669K
(396 °C)
Insolation (S⊕)
47.30
Earth = 1.00
Earth Similarity (ESI)
0.469
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-1669
Spectral Class
K-type orange
Effective Temperature
4,224 K — cooler than the Sun (5,778 K)
Estimated Age
13.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.603 R☉
Stellar Mass
0.609 M☉
Metallicity [Fe/H]
-0.20
Extended Stellar Properties
Surface gravity (log g)
4.662 dex
Stellar density
3.488 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.812 mas
Total Proper Motion
5.492 mas/yr
PM Right Ascension
1.48 mas/yr
PM Declination
5.29 mas/yr
Galactic Cartesian (pc)
x = 0.354 · y = -0.681 · z = 0.641
Equatorial (J2000)
RA 297.43038° · Dec 39.84788°
Galactic ℓ, b
74.472° · 6.908°
Ecliptic λ, β
313.679° · 59.197°
HTM-20 index
-1745764231
Similar Worlds
Kepler-1834 c
Rocky Terrestrial · K-type orange
Radius 1.22 R⊕ · 1,632.1 ly
Kepler-1223 b
Rocky Terrestrial · K-type orange
Radius 1.22 R⊕ · 1,500.2 ly
Kepler-763 b
Rocky Terrestrial · K-type orange
Radius 1.22 R⊕ · 3,139.1 ly
K2-414 b
Rocky Terrestrial · K-type orange
Radius 1.22 R⊕ · 848.1 ly
Kepler-1414 b
Rocky Terrestrial · K-type orange
Radius 1.23 R⊕ · 1,861.8 ly
Kepler-415 b
Rocky Terrestrial · K-type orange
Radius 1.21 R⊕ · 1,730.2 ly