Key parameters at a glance

A radius of 0.87 Earth radii
A mass of 0.59 Earth masses
Surface gravity around 0.78 g
An orbital period of 4.821 days
Semi-major axis 0.0571 AU
Equilibrium temperature 1,328 K (1055 °C)
Distance from Earth 1,727.31 light-years
Earth Similarity Index 0.227
Travel time at Voyager 1 speed 30,461,095 years

Kepler-1890 b Planet Profile

Physical Specs

Radius

0.87 R⊕

Radius (Jupiter)

0.078 R♃

Mass

0.59 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.92 g/cm³

Surface Gravity

0.78 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.227

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

#440of 570

top 77.0%

This planet

0.87R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

K2-209 b 0.87 R⊕ Kepler-1972 c 0.87 R⊕ Kepler-1907 b 0.87 R⊕

Metric	Earth	Kepler-1890 b	Jupiter
Radius (R⊕)	1.00	0.87	11.21
Mass (M⊕)	1.00	0.59	317.83
Density (g/cm³)	5.51	4.92	1.33
Surface Gravity (g)	1.00	0.78	2.53
Insolation (S⊕)	1.00	493.00	0.037

Star Catalogue Identifiers

TIC

TIC 137754713

Gaia DR2

Gaia DR2 2053515849540816768

Gaia DR3

Gaia DR3 2053515849540816768

System

Kepler-1890

Percentile among Rocky Terrestrial cohort

Radius 0.869 R⊕ · percentile 23 / cohort 570

Mass 0.587 M⊕ · percentile 19 / cohort 570

Orbital period 4.82 d · percentile 53 / cohort 567

Distance 529.60 pc · percentile 67 / cohort 566

ESI 0.227 · percentile 18 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.821 days

Semi-major axis

0.0571 AU

Eccentricity

0.000

Inclination

77.54 °

Year Length

A year here lasts approximately 4.82 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0571 AU.

Transit Fingerprint

Depth

0.004 %

Duration

3.468 h

Impact parameter b

0.016

Rp / R★

0.005900

Transit midpoint (BJD)

2,454,968.7852

Photometric dip

Transit produces a flux drop of 41 ppm lasting ≈ 3.47 h.

Extended Orbital Architecture

Planet / star radius ratio

0.005900

Semi-major axis / stellar radius

10.700

Impact parameter (b)

0.016

Transit mid-time (BJD)

2,454,968.7852

Angular separation (arcsec)

0.10800

Eq. Temperature

1,328K

(1055 °C)

Insolation (S⊕)

493.00

Earth = 1.00

Earth Similarity (ESI)

0.227

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-1890

Spectral Class

F-type yellow-white

Effective Temperature

6,046 K — hotter than the Sun (5,778 K)

Estimated Age

2.65 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.396 R☉

Stellar Mass

1.024 M☉

Metallicity [Fe/H]

-0.16

Extended Stellar Properties

Surface gravity (log g)

4.158 dex

Stellar density

0.064 g/cm³

Metallicity ratio

[Fe/H]

Distance

529.60 parsec

Light-years 1,727.31 ly

V-band magnitude

12.92 mag

Voyager-speed travel 30,461,095 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.860 mas

Total Proper Motion

11.270 mas/yr

PM Right Ascension

6.16 mas/yr

PM Declination

9.44 mas/yr

Galactic Cartesian (pc)

x = 0.291 · y = -0.700 · z = 0.652

Equatorial (J2000)

RA 292.57782° · Dec 40.66790°

Galactic ℓ, b

73.425° · 10.556°

Ecliptic λ, β

307.218° · 61.222°

HTM-20 index

1788434302