Key parameters at a glance

A radius of 2.75 Earth radii
A mass of 7.99 Earth masses
Surface gravity around 1.06 g
An orbital period of 12.191 days
Semi-major axis 0.0984 AU
Equilibrium temperature 763 K (490 °C)
Distance from Earth 3,283.18 light-years
Earth Similarity Index 0.320
Travel time at Voyager 1 speed 57,898,949 years

Kepler-1815 b Planet Profile

Physical Specs

Radius

2.75 R⊕

Radius (Jupiter)

0.245 R♃

Mass

7.99 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.11 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.320

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

#811of 1978

top 41.0%

This planet

2.75R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1448 b 2.75 R⊕ Kepler-25 b 2.75 R⊕ Kepler-304 d 2.75 R⊕

Metric	Earth	Kepler-1815 b	Jupiter
Radius (R⊕)	1.00	2.75	11.21
Mass (M⊕)	1.00	7.99	317.83
Density (g/cm³)	5.51	2.11	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	80.01	0.037

Star Catalogue Identifiers

TIC

TIC 239273090

Gaia DR2

Gaia DR2 2076050683953049728

Gaia DR3

Gaia DR3 2076050683953049728

System

Kepler-1815

Percentile among Sub-Neptune cohort

Radius 2.749 R⊕ · percentile 59 / cohort 1978

Mass 7.990 M⊕ · percentile 54 / cohort 1978

Orbital period 12.19 d · percentile 42 / cohort 1946

Distance 1,006.63 pc · percentile 78 / cohort 1975

ESI 0.320 · percentile 33 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.191 days

Semi-major axis

0.0984 AU

Eccentricity

0.000

Inclination

89.90 °

Year Length

A year here lasts approximately 12.19 Earth days (3.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0984 AU.

Transit Fingerprint

Depth

0.067 %

Duration

1.883 h

Impact parameter b

0.030

Rp / R★

0.023339

Transit midpoint (BJD)

2,454,969.3357

Photometric dip

Transit produces a flux drop of 666 ppm lasting ≈ 1.88 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023339

Semi-major axis / stellar radius

50.410

Impact parameter (b)

0.030

Transit mid-time (BJD)

2,454,969.3357

Angular separation (arcsec)

0.09780

Eq. Temperature

763K

(490 °C)

Insolation (S⊕)

80.01

Earth = 1.00

Earth Similarity (ESI)

0.320

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-1815

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,516 K — cooler than the Sun (5,778 K)

Estimated Age

13.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.967 R☉

Stellar Mass

0.856 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.399 dex

Stellar density

16.308 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,006.63 parsec

Light-years 3,283.18 ly

V-band magnitude

15.62 mag

Voyager-speed travel 57,898,949 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.966 mas

Total Proper Motion

11.879 mas/yr

PM Right Ascension

-2.54 mas/yr

PM Declination

-11.60 mas/yr

Galactic Cartesian (pc)

x = 0.362 · y = -0.622 · z = 0.694

Equatorial (J2000)

RA 300.17047° · Dec 43.98490°

Galactic ℓ, b

79.107° · 7.245°

Ecliptic λ, β

320.839° · 62.202°

HTM-20 index

-1726778065