Key parameters at a glance

A radius of 2.98 Earth radii
A mass of 9.19 Earth masses
Surface gravity around 1.03 g
An orbital period of 10.691 days
Semi-major axis 0.0996 AU
Equilibrium temperature 1,008 K (735 °C)
Distance from Earth 3,497.37 light-years
Earth Similarity Index 0.231
Travel time at Voyager 1 speed 61,676,130 years

2 siblings around KOI-7892

Kepler-457 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-457 d this	Sub-Neptune	2.98	9.19	10.691	1,008	2021
KIC 8540376 b	Neptune-like	4.10	15.80	31.810	—	2015
KIC 8540376 c	Sub-Neptune	2.40	6.35	75.200	—	2015

Kepler-457 d Planet Profile

Physical Specs

Radius

2.98 R⊕

Radius (Jupiter)

0.266 R♃

Mass

9.19 M⊕

Mass (Jupiter)

0.029 M♃

Density

1.90 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.231

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

#539of 1978

top 27.2%

This planet

2.98R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1667 b 2.98 R⊕ Kepler-1881 b 2.98 R⊕ Kepler-1717 b 2.99 R⊕

Metric	Earth	Kepler-457 d	Jupiter
Radius (R⊕)	1.00	2.98	11.21
Mass (M⊕)	1.00	9.19	317.83
Density (g/cm³)	5.51	1.90	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	244.47	0.037

Star Catalogue Identifiers

TIC

TIC 123449386

Gaia DR2

Gaia DR2 2105414310196331264

Gaia DR3

Gaia DR3 2105414310196331264

System

KOI-7892

Percentile among Sub-Neptune cohort

Radius 2.985 R⊕ · percentile 73 / cohort 1978

Mass 9.190 M⊕ · percentile 67 / cohort 1978

Orbital period 10.69 d · percentile 37 / cohort 1946

Distance 1,072.30 pc · percentile 82 / cohort 1975

ESI 0.231 · percentile 12 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.691 days

Semi-major axis

0.0996 AU

Eccentricity

0.000

Inclination

86.62 °

Year Length

A year here lasts approximately 10.69 Earth days (2.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0996 AU.

Transit Fingerprint

Depth

0.041 %

Duration

4.657 h

Impact parameter b

0.734

Rp / R★

0.019947

Transit midpoint (BJD)

2,454,974.1160

Photometric dip

Transit produces a flux drop of 408 ppm lasting ≈ 4.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019947

Semi-major axis / stellar radius

12.440

Impact parameter (b)

0.734

Transit mid-time (BJD)

2,454,974.1160

Angular separation (arcsec)

0.09290

Eq. Temperature

1,008K

(735 °C)

Insolation (S⊕)

244.47

Earth = 1.00

Earth Similarity (ESI)

0.231

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: KOI-7892

Spectral Class

F-type yellow-white

Effective Temperature

6,474 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.242 R☉

Stellar Mass

1.148 M☉

Metallicity [Fe/H]

-0.16

Extended Stellar Properties

Surface gravity (log g)

4.311 dex

Stellar density

0.319 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,072.30 parsec

Light-years 3,497.37 ly

V-band magnitude

14.41 mag

Voyager-speed travel 61,676,130 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.904 mas

Total Proper Motion

4.132 mas/yr

PM Right Ascension

2.83 mas/yr

PM Declination

-3.01 mas/yr

Galactic Cartesian (pc)

x = 0.152 · y = -0.694 · z = 0.703

Equatorial (J2000)

RA 282.37754° · Dec 44.69457°

Galactic ℓ, b

74.174° · 19.028°

Ecliptic λ, β

293.094° · 67.144°

HTM-20 index

-361451664