Key parameters at a glance
- A radius of 2.84 Earth radii
- A mass of 8.44 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 11.955 days
- Semi-major axis 0.0960 AU
- Equilibrium temperature 906 K (633 °C)
- Distance from Earth 1,094.30 light-years
- Earth Similarity Index 0.265
- Travel time at Voyager 1 speed 19,298,020 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1665 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#699of 1978
top 35.3%
This planet
2.84R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1665 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.84 | 11.21 |
| Mass (M⊕) | 1.00 | 8.44 | 317.83 |
| Density (g/cm³) | 5.51 | 2.03 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 40.40 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 122442334
Gaia DR2
Gaia DR2 2101773689759891328
Gaia DR3
Gaia DR3 2101773689759891328
System
Kepler-1665
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.95 Earth days (3.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0960 AU.
Transit Fingerprint
Depth
0.090 %
Duration
2.143 h
Impact parameter b
0.084
Rp / R★
0.026872
Transit midpoint (BJD)
2,455,011.7214
Photometric dip
Transit produces a flux drop of 904 ppm lasting ≈ 2.14 h.
Extended Orbital Architecture
Planet / star radius ratio
0.026872
Semi-major axis / stellar radius
44.020
Impact parameter (b)
0.084
Transit mid-time (BJD)
2,455,011.7214
Angular separation (arcsec)
0.28600
Eq. Temperature
906K
(633 °C)
Insolation (S⊕)
40.40
Earth = 1.00
Earth Similarity (ESI)
0.265
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-1665
Spectral Class
K-type orange
Effective Temperature
5,050 K — cooler than the Sun (5,778 K)
Estimated Age
13.90 Gyr — older than the Sun (4.6 Gyr)
Stellar Radius
0.778 R☉
Stellar Mass
0.842 M☉
Metallicity [Fe/H]
-0.01
Extended Stellar Properties
Surface gravity (log g)
4.582 dex
Stellar density
2.523 g/cm³
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.952 mas
Total Proper Motion
32.282 mas/yr
PM Right Ascension
4.72 mas/yr
PM Declination
-31.94 mas/yr
Galactic Cartesian (pc)
x = 0.263 · y = -0.707 · z = 0.657
Equatorial (J2000)
RA 290.39624° · Dec 41.03992°
Galactic ℓ, b
73.023° · 12.201°
Ecliptic λ, β
304.151° · 62.082°
HTM-20 index
-1602288110
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HD 3167 e
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HD 110067 d
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