Key parameters at a glance
- A radius of 1.49 Earth radii
- A mass of 2.83 Earth masses
- Surface gravity around 1.27 g
- An orbital period of 5.871 days
- Semi-major axis 0.0545 AU
- Equilibrium temperature 616 K (343 °C)
- Distance from Earth 1,581.50 light-years
- Earth Similarity Index 0.490
- Travel time at Voyager 1 speed 27,889,770 years
- Almost certainly tidally locked to its host star given the close orbit
Kepler-898 b Planet Profile
Physical Specs
Classification
Planet Type
Super-Earth
Discovery
Size rank in cohort
Rank by radius
#766of 1176
top 65.1%
This planet
1.49R⊕
Super-Earth median
1.60R⊕
Nearest-size peers
| Metric | Earth | Kepler-898 b | Jupiter |
|---|---|---|---|
| Radius (R⊕) | 1.00 | 1.49 | 11.21 |
| Mass (M⊕) | 1.00 | 2.83 | 317.83 |
| Density (g/cm³) | 5.51 | 4.70 | 1.33 |
| Surface Gravity (g) | 1.00 | 1.27 | 2.53 |
| Insolation (S⊕) | 1.00 | 37.11 | 0.037 |
Star Catalogue Identifiers
TIC
TIC 158272820
Gaia DR2
Gaia DR2 2130552994298492288
Gaia DR3
Gaia DR3 2130552994298492288
System
Kepler-898
Percentile among Super-Earth cohort
Orbit & Habitability
Orbital Dynamics
Year Length
A year here lasts approximately 5.87 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0545 AU.
Transit Fingerprint
Depth
0.051 %
Duration
2.498 h
Impact parameter b
0.642
Rp / R★
0.022147
Transit midpoint (BJD)
2,454,970.2495
Photometric dip
Transit produces a flux drop of 506 ppm lasting ≈ 2.50 h.
Extended Orbital Architecture
Planet / star radius ratio
0.022147
Semi-major axis / stellar radius
13.880
Impact parameter (b)
0.642
Transit mid-time (BJD)
2,454,970.2495
Angular separation (arcsec)
0.11200
Eq. Temperature
616K
(343 °C)
Insolation (S⊕)
37.11
Earth = 1.00
Earth Similarity (ESI)
0.490
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
Morton et al. 2016Instrument
Kepler CCD Array
Publication
2016-05
Observation locale
Space
Discovery cohort
Planets confirmed in 2016 at Kepler (12 shown).
Host System: Kepler-898
Spectral Class
K-type orange
Effective Temperature
4,223 K — cooler than the Sun (5,778 K)
Estimated Age
3.98 Gyr — younger than the Sun (4.6 Gyr)
Stellar Radius
0.620 R☉
Stellar Mass
0.650 M☉
Metallicity [Fe/H]
-0.06
Extended Stellar Properties
Surface gravity (log g)
4.660 dex
Stellar density
1.466 g/cm³
Metallicity ratio
[Fe/H]
Multi-band Host Photometry — 16 bands
Astrometric Data
Parallax
2.034 mas
Total Proper Motion
10.196 mas/yr
PM Right Ascension
2.98 mas/yr
PM Declination
-9.75 mas/yr
Galactic Cartesian (pc)
x = 0.195 · y = -0.655 · z = 0.730
Equatorial (J2000)
RA 286.58541° · Dec 46.87089°
Galactic ℓ, b
77.406° · 17.052°
Ecliptic λ, β
302.117° · 68.469°
HTM-20 index
-1752954837
Similar Worlds
KMT-2021-BLG-0912L b
Super-Earth · K-type orange
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TOI-431 c
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Kepler-174 c
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K2-268 d
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Radius 1.49 R⊕ · 1,069.1 ly