Key parameters at a glance
- A radius of 2.81 Earth radii
- A mass of 8.32 Earth masses
- Surface gravity around 1.05 g
- An orbital period of 24.220 days
- Semi-major axis 0.1546 AU
- Equilibrium temperature 505 K (232 °C)
- Distance from Earth 3,206.68 light-years
- Earth Similarity Index 0.470
- Travel time at Voyager 1 speed 56,549,816 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-1897 b Planet Profile
Physical Specs
Classification
Planet Type
Sub-Neptune
Discovery
Size rank in cohort
Rank by radius
#729of 1978
top 36.8%
This planet
2.81R⊕
Sub-Neptune median
2.71R⊕
Nearest-size peers
| Metric | Earth | Kepler-1897 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 2.81 | 11.21 |
| Mass (M⊕) | 1.00 | 8.32 | 317.83 |
| Density (g/cm³) | 5.51 | 2.05 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.05 | 2.53 |
| Insolation (S⊕) | 1.00 | 15.43 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 138645719
Gaia DR2
Gaia DR2 2052410599840071040
Gaia DR3
Gaia DR3 2052410599840071040
System
Kepler-1897
Percentile among Sub-Neptune cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 24.22 Earth days (6.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1546 AU.
Transit Fingerprint
Depth
0.081 %
Duration
3.271 h
Impact parameter b
0.032
Rp / R★
0.025317
Transit midpoint (BJD)
2,454,979.4237
Photometric dip
Transit produces a flux drop of 806 ppm lasting ≈ 3.27 h.
Extended Orbital Architecture
Planet / star radius ratio
0.025317
Semi-major axis / stellar radius
57.980
Impact parameter (b)
0.032
Transit mid-time (BJD)
2,454,979.4237
Angular separation (arcsec)
0.15700
Eq. Temperature
505K
(232 °C)
Insolation (S⊕)
15.43
Earth = 1.00
Earth Similarity (ESI)
0.470
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
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-1897
Spectral Class
K-type orange
Effective Temperature
5,165 K — cooler than the Sun (5,778 K)
Estimated Age
4.20 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.761 R☉
Stellar Mass
0.859 M☉
Metallicity [Fe/H]
0.02
Extended Stellar Properties
Surface gravity (log g)
4.599 dex
Stellar density
6.285 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
0.990 mas
Total Proper Motion
7.995 mas/yr
PM Right Ascension
7.19 mas/yr
PM Declination
3.49 mas/yr
Galactic Cartesian (pc)
x = 0.319 · y = -0.707 · z = 0.631
Equatorial (J2000)
RA 294.29010° · Dec 39.12687°
Galactic ℓ, b
72.652° · 8.680°
Ecliptic λ, β
308.738° · 59.342°
HTM-20 index
1188282483
Similar Worlds
Kepler-1996 c
Sub-Neptune · K-type orange
Radius 2.81 R⊕ · 1,436.9 ly
Kepler-1234 b
Sub-Neptune · K-type orange
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Kepler-892 b
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Radius 2.81 R⊕ · 1,861.5 ly
Kepler-1359 b
Sub-Neptune · K-type orange
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Gl 410 b
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HD 3167 e
Sub-Neptune · K-type orange
Radius 2.83 R⊕ · 154.2 ly