Key parameters at a glance
- A radius of 3.30 Earth radii
- A mass of 10.90 Earth masses
- Surface gravity around 1.00 g
- An orbital period of 17.605 days
- Semi-major axis 0.1072 AU
- Equilibrium temperature 362 K (89 °C)
- Distance from Earth 1,102.17 light-years
- Earth Similarity Index 0.581
- Travel time at Voyager 1 speed 19,436,695 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1663 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#279of 1978
top 14.1%
This planet
3.30R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1663 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.30 | 11.21 |
| Mass (M⊕) | 1.00 | 10.90 | 317.83 |
| Density (g/cm³) | 5.51 | 1.66 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.00 | 2.53 |
| Insolation (S⊕) | 1.00 | 4.07 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 407001589
Gaia DR2
Gaia DR2 2129578826996503040
Gaia DR3
Gaia DR3 2129578826996503040
System
Kepler-1663
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 17.60 Earth days (4.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1072 AU.
Transit Fingerprint
Depth
0.237 %
Duration
3.716 h
Impact parameter b
0.715
Rp / R★
0.049169
Transit midpoint (BJD)
2,455,003.4993
Photometric dip
Transit produces a flux drop of 2,374 ppm lasting ≈ 3.72 h.
Extended Orbital Architecture
Planet / star radius ratio
0.049169
Semi-major axis / stellar radius
27.700
Impact parameter (b)
0.715
Transit mid-time (BJD)
2,455,003.4993
Angular separation (arcsec)
0.31700
Eq. Temperature
362K
(89 °C)
Insolation (S⊕)
4.07
Earth = 1.00
Earth Similarity (ESI)
0.581
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. 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-1663
Spectral Class
K-type orange
Effective Temperature
3,844 K — cooler than the Sun (5,778 K)
Estimated Age
0.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.629 R☉
Stellar Mass
0.611 M☉
Metallicity [Fe/H]
0.06
Extended Stellar Properties
Surface gravity (log g)
4.627 dex
Stellar density
3.467 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.931 mas
Total Proper Motion
40.301 mas/yr
PM Right Ascension
-1.98 mas/yr
PM Declination
40.25 mas/yr
Galactic Cartesian (pc)
x = 0.230 · y = -0.617 · z = 0.753
Equatorial (J2000)
RA 290.40152° · Dec 48.82272°
Galactic ℓ, b
80.311° · 15.444°
Ecliptic λ, β
310.703° · 69.395°
HTM-20 index
357777689
Similar Worlds
K2-266 b
Sub-Neptune · K-type orange
Radius 3.30 R⊕ · 253.0 ly
Kepler-305 c
Sub-Neptune · K-type orange
Radius 3.30 R⊕ · 2,832.6 ly
TOI-431 d
Sub-Neptune · K-type orange
Radius 3.29 R⊕ · 106.2 ly
Kepler-1999 b
Sub-Neptune · K-type orange
Radius 3.29 R⊕ · 2,287.2 ly
Kepler-411 d
Sub-Neptune · K-type orange
Radius 3.32 R⊕ · 501.2 ly
Kepler-1270 b
Sub-Neptune · K-type orange
Radius 3.32 R⊕ · 3,571.6 ly