Key parameters at a glance

A radius of 3.10 Earth radii
A mass of 9.80 Earth masses
Surface gravity around 1.02 g
An orbital period of 44.870 days
Semi-major axis 0.2529 AU
Equilibrium temperature 536 K (263 °C)
Distance from Earth 5,651.99 light-years
Earth Similarity Index 0.428
Travel time at Voyager 1 speed 99,672,837 years

Kepler-1896 b Planet Profile

Physical Specs

Radius

3.10 R⊕

Radius (Jupiter)

0.277 R♃

Mass

9.80 M⊕

Mass (Jupiter)

0.031 M♃

Density

1.81 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.428

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

#442of 1978

top 22.3%

This planet

3.10R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-209 c 3.10 R⊕ Kepler-104 b 3.10 R⊕ TOI-1062 c 3.10 R⊕

Metric	Earth	Kepler-1896 b	Jupiter
Radius (R⊕)	1.00	3.10	11.21
Mass (M⊕)	1.00	9.80	317.83
Density (g/cm³)	5.51	1.81	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	19.50	0.037

Star Catalogue Identifiers

TIC

TIC 394175334

Gaia DR2

Gaia DR2 2101351511654637696

Gaia DR3

Gaia DR3 2101351511654637696

System

Kepler-1896

Percentile among Sub-Neptune cohort

Radius 3.099 R⊕ · percentile 78 / cohort 1978

Mass 9.800 M⊕ · percentile 71 / cohort 1978

Orbital period 44.87 d · percentile 83 / cohort 1946

Distance 1,732.91 pc · percentile 95 / cohort 1975

ESI 0.428 · percentile 58 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

44.870 days

Semi-major axis

0.2529 AU

Eccentricity

0.000

Inclination

89.67 °

Year Length

A year here lasts approximately 44.87 Earth days (12.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2529 AU.

Transit Fingerprint

Depth

0.064 %

Duration

4.199 h

Impact parameter b

0.295

Rp / R★

0.023536

Transit midpoint (BJD)

2,454,974.1230

Photometric dip

Transit produces a flux drop of 636 ppm lasting ≈ 4.20 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023536

Semi-major axis / stellar radius

68.700

Impact parameter (b)

0.295

Transit mid-time (BJD)

2,454,974.1230

Angular separation (arcsec)

0.14600

Eq. Temperature

536K

(263 °C)

Insolation (S⊕)

19.50

Earth = 1.00

Earth Similarity (ESI)

0.428

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-1896

Spectral Class

F-type yellow-white

Effective Temperature

6,122 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.996 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.471 dex

Stellar density

4.062 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,732.91 parsec

Light-years 5,651.99 ly

V-band magnitude

15.84 mag

Voyager-speed travel 99,672,837 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.549 mas

Total Proper Motion

2.574 mas/yr

PM Right Ascension

-0.30 mas/yr

PM Declination

2.56 mas/yr

Galactic Cartesian (pc)

x = 0.257 · y = -0.719 · z = 0.646

Equatorial (J2000)

RA 289.67858° · Dec 40.24965°

Galactic ℓ, b

72.054° · 12.355°

Ecliptic λ, β

302.566° · 61.482°

HTM-20 index

-822989038