Key parameters at a glance

A radius of 0.93 Earth radii
A mass of 0.76 Earth masses
Surface gravity around 0.87 g
An orbital period of 4.766 days
Semi-major axis 0.0506 AU
Equilibrium temperature 1,167 K (894 °C)
Distance from Earth 1,177.17 light-years
Earth Similarity Index 0.268
Travel time at Voyager 1 speed 20,759,312 years

Kepler-1898 b Planet Profile

Physical Specs

Radius

0.93 R⊕

Radius (Jupiter)

0.083 R♃

Mass

0.76 M⊕

Mass (Jupiter)

0.002 M♃

Density

5.13 g/cm³

Surface Gravity

0.87 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.268

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#390of 570

top 68.2%

This planet

0.93R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

K2-157 b 0.94 R⊕ Kepler-398 b 0.93 R⊕ Kepler-1421 b 0.93 R⊕

Metric	Earth	Kepler-1898 b	Jupiter
Radius (R⊕)	1.00	0.93	11.21
Mass (M⊕)	1.00	0.76	317.83
Density (g/cm³)	5.51	5.13	1.33
Surface Gravity (g)	1.00	0.87	2.53
Insolation (S⊕)	1.00	204.60	0.037

Star Catalogue Identifiers

TIC

TIC 121124617

Gaia DR2

Gaia DR2 2099597408349457024

Gaia DR3

Gaia DR3 2099597408349457024

System

Kepler-1898

Percentile among Rocky Terrestrial cohort

Radius 0.934 R⊕ · percentile 32 / cohort 570

Mass 0.760 M⊕ · percentile 27 / cohort 570

Orbital period 4.77 d · percentile 52 / cohort 567

Distance 360.92 pc · percentile 48 / cohort 566

ESI 0.268 · percentile 29 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.766 days

Semi-major axis

0.0506 AU

Eccentricity

0.000

Inclination

89.51 °

Year Length

A year here lasts approximately 4.77 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0506 AU.

Transit Fingerprint

Depth

0.007 %

Duration

2.165 h

Impact parameter b

0.331

Rp / R★

0.007495

Transit midpoint (BJD)

2,454,966.5038

Photometric dip

Transit produces a flux drop of 68 ppm lasting ≈ 2.17 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007495

Semi-major axis / stellar radius

16.520

Impact parameter (b)

0.331

Transit mid-time (BJD)

2,454,966.5038

Angular separation (arcsec)

0.14000

Eq. Temperature

1,167K

(894 °C)

Insolation (S⊕)

204.60

Earth = 1.00

Earth Similarity (ESI)

0.268

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1898

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,702 K — cooler than the Sun (5,778 K)

Estimated Age

13.18 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.125 R☉

Stellar Mass

0.837 M☉

Metallicity [Fe/H]

-0.28

Extended Stellar Properties

Surface gravity (log g)

4.258 dex

Stellar density

3.756 g/cm³

Metallicity ratio

[Fe/H]

Distance

360.92 parsec

Light-years 1,177.17 ly

V-band magnitude

13.39 mag

Voyager-speed travel 20,759,312 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Parallax

2.742 mas

Total Proper Motion

23.128 mas/yr

PM Right Ascension

1.72 mas/yr

PM Declination

23.06 mas/yr

Galactic Cartesian (pc)

x = 0.232 · y = -0.748 · z = 0.622

Equatorial (J2000)

RA 287.20580° · Dec 38.49819°

Galactic ℓ, b

69.603° · 13.359°

Ecliptic λ, β

297.839° · 60.285°

HTM-20 index

700184786