Key parameters at a glance
- A radius of 2.78 Earth radii
- A mass of 8.15 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 9.512 days
- Semi-major axis 0.0745 AU
- Equilibrium temperature 530 K (257 °C)
- Distance from Earth 1,772.48 light-years
- Earth Similarity Index 0.452
- 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 b 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 | Rocky Terrestrial | 1.22 | 1.98 | 4.729 | 669 | 2023 |
| Kepler-1669 b this | Sub-Neptune | 2.78 | 8.15 | 9.512 | 530 | 2020 |
Kepler-1669 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#767of 1978
top 38.7%
This planet
2.78R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1669 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.78 | 11.21 |
| Mass (M⊕) | 1.00 | 8.15 | 317.83 |
| Density (g/cm³) | 5.51 | 2.08 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 18.66 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 169457234
Gaia DR2
Gaia DR2 2073652546016392448
Gaia DR3
Gaia DR3 2073652546016392448
System
Kepler-1669
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 9.51 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0745 AU.
Transit Fingerprint
Depth
0.117 %
Duration
2.950 h
Impact parameter b
0.133
Rp / R★
0.039326
Transit midpoint (BJD)
2,455,018.4791
Photometric dip
Transit produces a flux drop of 1,169 ppm lasting ≈ 2.95 h.
Extended Orbital Architecture
Planet / star radius ratio
0.039326
Semi-major axis / stellar radius
25.170
Impact parameter (b)
0.133
Transit mid-time (BJD)
2,455,018.4791
Angular separation (arcsec)
0.13700
Eq. Temperature
530K
(257 °C)
Insolation (S⊕)
18.66
Earth = 1.00
Earth Similarity (ESI)
0.452
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
Armstrong et al. 2021Instrument
Kepler CCD Array
Publication
2021-07
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Kepler (12 shown).
Host System: Kepler-1669
Spectral Class
K-type orange
Effective Temperature
4,303 K — cooler than the Sun (5,778 K)
Estimated Age
13.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.714 R☉
Stellar Mass
0.670 M☉
Metallicity [Fe/H]
-0.23
Extended Stellar Properties
Surface gravity (log g)
4.557 dex
Stellar density
2.593 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
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