Key parameters at a glance
- A radius of 2.21 Earth radii
- A mass of 5.40 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 11.873 days
- Semi-major axis 0.1029 AU
- Equilibrium temperature 938 K (665 °C)
- Distance from Earth 695.56 light-years
- Earth Similarity Index 0.279
- Travel time at Voyager 1 speed 12,266,205 years
Kepler-1655 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1655of 1978
top 83.6%
This planet
2.21R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1655 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.21 | 11.21 |
| Mass (M⊕) | 1.00 | 5.40 | 317.83 |
| Density (g/cm³) | 5.51 | 2.72 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 129.10 | 0.037 |
Alternative Mass Estimates
| Method | Value | Interpretation |
|---|---|---|
| Best measured mass | 5.400 M⊕ | Direct mass measurement (not derived). |
Star Catalogue Identifiers
TIC
TIC 120973167
Gaia DR2
Gaia DR2 2100392428275714688
Gaia DR3
Gaia DR3 2100392428275714688
System
Kepler-1655
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 11.87 Earth days (3.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1029 AU.
Transit Fingerprint
Depth
0.034 %
Duration
2.366 h
Impact parameter b
0.880
Rp / R★
0.017014
Transit midpoint (BJD)
2,455,013.8980
Photometric dip
Transit produces a flux drop of 343 ppm lasting ≈ 2.37 h.
Extended Orbital Architecture
Planet / star radius ratio
0.017014
Semi-major axis / stellar radius
38.960
Impact parameter (b)
0.880
RV semi-amplitude (K)
1.510 m/s
Transit mid-time (BJD)
2,455,013.8980
Long. of periastron (ω)
-71.00°
Angular separation (arcsec)
0.48300
Eq. Temperature
938K
(665 °C)
Insolation (S⊕)
129.10
Earth = 1.00
Earth Similarity (ESI)
0.279
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.
Detection Signatures
Transit photometry
A transit dip has been observed from at least one telescope.
Radial velocity
Stellar wobble has been measured spectroscopically.
Discovery Paper
Primary reference
Haywood et al. 2018Instrument
Kepler CCD Array
Publication
2018-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2018 at Kepler (6 shown).
Host System: Kepler-1655
Spectral Class
G-type yellow (Sun-like)
Effective Temperature
6,148 K — hotter than the Sun (5,778 K)
Estimated Age
2.56 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
1.030 R☉
Stellar Mass
1.030 M☉
Metallicity [Fe/H]
-0.24
Extended Stellar Properties
Surface gravity (log g)
4.416 dex
Stellar density
0.790 g/cm³
Rotational v·sin i
3.50 km/s
Rotation period
13.60 days
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 17 bands
Astrometric Data
Parallax
4.660 mas
Total Proper Motion
44.827 mas/yr
PM Right Ascension
29.51 mas/yr
PM Declination
33.74 mas/yr
Galactic Cartesian (pc)
x = 0.223 · y = -0.742 · z = 0.632
Equatorial (J2000)
RA 286.68960° · Dec 39.21208°
Galactic ℓ, b
70.106° · 14.017°
Ecliptic λ, β
297.386° · 61.074°
HTM-20 index
-744670786
Similar Worlds
K2-374 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 1,172.3 ly
Kepler-538 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.22 R⊕ · 508.7 ly
Kepler-632 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 1,138.3 ly
Kepler-862 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 3,388.9 ly
Kepler-110 c
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 1,913.0 ly
Kepler-1980 b
Sub-Neptune · G-type yellow (Sun-like)
Radius 2.21 R⊕ · 5,575.3 ly