Key parameters at a glance
- A radius of 2.42 Earth radii
- A mass of 6.44 Earth masses
- Surface gravity around 1.10 g
- An orbital period of 88.072 days
- Semi-major axis 0.3575 AU
- Equilibrium temperature 330 K (57 °C)
- Distance from Earth 2,717.06 light-years
- Earth Similarity Index 0.705
- Travel time at Voyager 1 speed 47,915,330 years
Kepler-1858 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#1298of 1978
top 65.6%
This planet
2.42R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1858 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.42 | 11.21 |
| Mass (M⊕) | 1.00 | 6.44 | 317.83 |
| Density (g/cm³) | 5.51 | 2.49 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.10 | 2.53 |
| Insolation (S⊕) | 1.00 | 2.79 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 63205796
Gaia DR2
Gaia DR2 2128318305636573824
Gaia DR3
Gaia DR3 2128318305636573824
System
Kepler-1858
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 88.07 Earth days (24.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3575 AU.
Transit Fingerprint
Depth
0.096 %
Duration
6.772 h
Impact parameter b
0.024
Rp / R★
0.026500
Transit midpoint (BJD)
2,455,047.5172
Photometric dip
Transit produces a flux drop of 955 ppm lasting ≈ 6.77 h.
Extended Orbital Architecture
Planet / star radius ratio
0.026500
Semi-major axis / stellar radius
102.000
Impact parameter (b)
0.024
Transit mid-time (BJD)
2,455,047.5172
Angular separation (arcsec)
0.42900
Eq. Temperature
330K
(57 °C)
Insolation (S⊕)
2.79
Earth = 1.00
Earth Similarity (ESI)
0.705
0 = alien, 1 = Earth-identical
Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.
Discovery Paper
Primary reference
Valizadegan et al. 2022Instrument
Kepler CCD Array
Publication
2022-02
Observation locale
Space
Discovery cohort
Planets confirmed in 2021 at Kepler (12 shown).
Host System: Kepler-1858
Spectral Class
K-type orange
Effective Temperature
4,939 K — cooler than the Sun (5,778 K)
Estimated Age
0.70 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.819 R☉
Stellar Mass
0.785 M☉
Metallicity [Fe/H]
0.16
Extended Stellar Properties
Surface gravity (log g)
4.506 dex
Stellar density
2.171 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
1.173 mas
Total Proper Motion
8.492 mas/yr
PM Right Ascension
-3.14 mas/yr
PM Declination
-7.89 mas/yr
Galactic Cartesian (pc)
x = 0.261 · y = -0.635 · z = 0.727
Equatorial (J2000)
RA 292.30743° · Dec 46.62658°
Galactic ℓ, b
78.802° · 13.363°
Ecliptic λ, β
311.579° · 66.874°
HTM-20 index
-983571253
Similar Worlds
K2-43 c
Sub-Neptune · K-type orange
Radius 2.42 R⊕ · 595.4 ly
Kepler-1716 b
Sub-Neptune · K-type orange
Radius 2.42 R⊕ · 637.4 ly
TOI-904 b
Sub-Neptune · K-type orange
Radius 2.43 R⊕ · 150.3 ly
TOI-178 f
Sub-Neptune · K-type orange
Radius 2.42 R⊕ · 204.5 ly
Kepler-1526 b
Sub-Neptune · K-type orange
Radius 2.43 R⊕ · 1,812.0 ly
K2-324 b
Sub-Neptune · K-type orange
Radius 2.43 R⊕ · 445.7 ly