Key parameters at a glance

A radius of 3.02 Earth radii
A mass of 9.36 Earth masses
Surface gravity around 1.03 g
An orbital period of 10.087 days
Semi-major axis 0.0956 AU
Equilibrium temperature 942 K (669 °C)
Distance from Earth 4,162.70 light-years
Earth Similarity Index 0.248
Travel time at Voyager 1 speed 73,409,147 years

Kepler-1778 b Planet Profile

Physical Specs

Radius

3.02 R⊕

Radius (Jupiter)

0.269 R♃

Mass

9.36 M⊕

Mass (Jupiter)

0.029 M♃

Density

1.87 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.248

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

#506of 1978

top 25.5%

This planet

3.02R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-248 b 3.02 R⊕ Kepler-1112 b 3.02 R⊕ TOI-4010 b 3.02 R⊕

Metric	Earth	Kepler-1778 b	Jupiter
Radius (R⊕)	1.00	3.02	11.21
Mass (M⊕)	1.00	9.36	317.83
Density (g/cm³)	5.51	1.87	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	186.14	0.037

Star Catalogue Identifiers

TIC

TIC 158433884

Gaia DR2

Gaia DR2 2106006156689931648

Gaia DR3

Gaia DR3 2106006156689931648

System

Kepler-1778

Percentile among Sub-Neptune cohort

Radius 3.017 R⊕ · percentile 74 / cohort 1978

Mass 9.360 M⊕ · percentile 68 / cohort 1978

Orbital period 10.09 d · percentile 34 / cohort 1946

Distance 1,276.29 pc · percentile 88 / cohort 1975

ESI 0.248 · percentile 16 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.087 days

Semi-major axis

0.0956 AU

Eccentricity

0.000

Inclination

85.49 °

Year Length

A year here lasts approximately 10.09 Earth days (2.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0956 AU.

Transit Fingerprint

Depth

0.057 %

Duration

2.988 h

Impact parameter b

0.975

Rp / R★

0.026351

Transit midpoint (BJD)

2,454,968.1358

Photometric dip

Transit produces a flux drop of 568 ppm lasting ≈ 2.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026351

Semi-major axis / stellar radius

7.000

Impact parameter (b)

0.975

Transit mid-time (BJD)

2,454,968.1358

Angular separation (arcsec)

0.07490

Eq. Temperature

942K

(669 °C)

Insolation (S⊕)

186.14

Earth = 1.00

Earth Similarity (ESI)

0.248

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-1778

Spectral Class

F-type yellow-white

Effective Temperature

6,310 K — hotter than the Sun (5,778 K)

Estimated Age

0.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.095 R☉

Stellar Mass

1.143 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.417 dex

Stellar density

0.299 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,276.29 parsec

Light-years 4,162.70 ly

V-band magnitude

15.27 mag

Voyager-speed travel 73,409,147 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.755 mas

Total Proper Motion

2.105 mas/yr

PM Right Ascension

0.40 mas/yr

PM Declination

2.07 mas/yr

Galactic Cartesian (pc)

x = 0.216 · y = -0.690 · z = 0.691

Equatorial (J2000)

RA 287.36130° · Dec 43.73880°

Galactic ℓ, b

74.607° · 15.354°

Ecliptic λ, β

301.076° · 65.316°

HTM-20 index

2369388