Key parameters at a glance

A radius of 3.61 Earth radii
A mass of 12.70 Earth masses
Surface gravity around 0.98 g
An orbital period of 109.445 days
Semi-major axis 0.4276 AU
Equilibrium temperature 340 K (67 °C)
Distance from Earth 2,578.32 light-years
Earth Similarity Index 0.588
Travel time at Voyager 1 speed 45,468,589 years

Kepler-1780 b Planet Profile

Physical Specs

Radius

3.61 R⊕

Radius (Jupiter)

0.322 R♃

Mass

12.70 M⊕

Mass (Jupiter)

0.040 M♃

Density

1.49 g/cm³

Surface Gravity

0.98 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.588

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

#138of 1978

top 6.9%

This planet

3.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-225 b 3.61 R⊕ Kepler-869 b 3.61 R⊕ Kepler-258 c 3.61 R⊕

Metric	Earth	Kepler-1780 b	Jupiter
Radius (R⊕)	1.00	3.61	11.21
Mass (M⊕)	1.00	12.70	317.83
Density (g/cm³)	5.51	1.49	1.33
Surface Gravity (g)	1.00	0.98	2.53
Insolation (S⊕)	1.00	3.14	0.037

Star Catalogue Identifiers

TIC

TIC 270862497

Gaia DR2

Gaia DR2 2078135461074212736

Gaia DR3

Gaia DR3 2078135461074212736

System

Kepler-1780

Percentile among Sub-Neptune cohort

Radius 3.606 R⊕ · percentile 93 / cohort 1978

Mass 12.700 M⊕ · percentile 86 / cohort 1978

Orbital period 109.44 d · percentile 95 / cohort 1946

Distance 790.52 pc · percentile 65 / cohort 1975

ESI 0.588 · percentile 81 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

109.445 days

Semi-major axis

0.4276 AU

Eccentricity

0.000

Inclination

89.96 °

Year Length

A year here lasts approximately 109.44 Earth days (30.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4276 AU.

Transit Fingerprint

Depth

0.127 %

Duration

4.153 h

Impact parameter b

0.149

Rp / R★

0.032089

Transit midpoint (BJD)

2,455,030.9842

Photometric dip

Transit produces a flux drop of 1,270 ppm lasting ≈ 4.15 h.

Extended Orbital Architecture

Planet / star radius ratio

0.032089

Semi-major axis / stellar radius

225.200

Impact parameter (b)

0.149

Transit mid-time (BJD)

2,455,030.9842

Angular separation (arcsec)

0.54100

Eq. Temperature

340K

(67 °C)

Insolation (S⊕)

3.14

Earth = 1.00

Earth Similarity (ESI)

0.588

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-1780

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,403 K — cooler than the Sun (5,778 K)

Estimated Age

0.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.868 R☉

Stellar Mass

0.868 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

18.033 g/cm³

Metallicity ratio

[Fe/H]

Distance

790.52 parsec

Light-years 2,578.32 ly

V-band magnitude

14.91 mag

Voyager-speed travel 45,468,589 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.237 mas

Total Proper Motion

15.701 mas/yr

PM Right Ascension

1.01 mas/yr

PM Declination

-15.67 mas/yr

Galactic Cartesian (pc)

x = 0.299 · y = -0.670 · z = 0.680

Equatorial (J2000)

RA 294.08393° · Dec 42.80951°

Galactic ℓ, b

75.885° · 10.532°

Ecliptic λ, β

311.014° · 62.861°

HTM-20 index

-954179469