Key parameters at a glance
- A radius of 3.87 Earth radii
- A mass of 17.00 Earth masses
- Surface gravity around 1.14 g
- An orbital period of 175.060 days
- Semi-major axis 0.6330 AU
- Equilibrium temperature 243 K (-30 °C)
- Distance from Earth 1,339.22 light-years
- Earth Similarity Index 0.583
- Travel time at Voyager 1 speed 23,617,132 years
Context from the literature
The list of exoplanets detected by the Kepler space telescope contains bodies with a wide variety of properties, with significant ranges in orbital distances, masses, radii, composition, habitability, and host star type. As of June 16 2023, the Kepler space telescope and its follow-up observations have detected 2,778 planets, including hot Jupiters, super-Earths, circumbinary planets, and planets located in the circumstellar habitable zones of their host stars. Kepler has detected over 3,601 unconfirmed planet candidates and 2,165 eclipsing binary stars.
Excerpted from Wikipedia · full article
Circumbinary planet
Kepler-1661 b orbits a binary-star pair rather than a single host — a minority architecture in the confirmed catalogue.
Kepler-1661 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#38of 1978
top 1.9%
This planet
3.87R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1661 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 3.87 | 11.21 |
| Mass (M⊕) | 1.00 | 17.00 | 317.83 |
| Density (g/cm³) | 5.51 | 1.60 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.14 | 2.53 |
| Insolation (S⊕) | 1.00 | 0.88 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 17.000 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 164886585
Gaia DR2
Gaia DR2 2104078025612319360
Gaia DR3
Gaia DR3 2104078025612319360
System
Kepler-1661
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 175.06 Earth days (47.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6330 AU.
Transit Fingerprint
Rp / R★
0.046510
Transit midpoint (BJD)
2,456,007.1000
Extended Orbital Architecture
Planet / star radius ratio
0.046510
Transit mid-time (BJD)
2,456,007.1000
Long. of periastron (ω)
67.10°
Angular separation (arcsec)
1.54000
Eq. Temperature
243K
(-30 °C)
Insolation (S⊕)
0.88
Earth = 1.00
Earth Similarity (ESI)
0.583
0 = alien, 1 = Earth-identical
Within the conservative habitable zone — surface water would be frozen.
Discovery Paper
Primary reference
Socia et al. 2020Instrument
Kepler CCD Array
Publication
2020-03
Observation locale
Space
Discovery cohort
Planets confirmed in 2020 at Kepler (12 shown).
Host System: Kepler-1661
Spectral Class
K-type orange
Effective Temperature
5,100 K — cooler than the Sun (5,778 K)
Estimated Age
2.00 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.762 R☉
Stellar Mass
0.841 M☉
Metallicity [Fe/H]
-0.12
Extended Stellar Properties
Surface gravity (log g)
4.660 dex
Stellar density
4.626 g/cm³
Rotational v·sin i
2.50 km/s
Rotation period
24.44 days
Metallicity ratio
[M/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.407 mas
Total Proper Motion
27.603 mas/yr
PM Right Ascension
-7.99 mas/yr
PM Declination
-26.42 mas/yr
Galactic Cartesian (pc)
x = 0.195 · y = -0.718 · z = 0.669
Equatorial (J2000)
RA 285.16709° · Dec 41.96694°
Galactic ℓ, b
72.265° · 16.157°
Ecliptic λ, β
296.365° · 64.024°
HTM-20 index
2139885455
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