Key parameters at a glance

A radius of 1.10 Earth radii
A mass of 1.39 Earth masses
Surface gravity around 1.14 g
An orbital period of 8.617 days
Semi-major axis 0.0763 AU
Equilibrium temperature 733 K (460 °C)
Distance from Earth 1,580.56 light-years
Earth Similarity Index 0.441
Travel time at Voyager 1 speed 27,873,090 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1966 b Planet Profile

Physical Specs

Radius

1.10 R⊕

Radius (Jupiter)

0.099 R♃

Mass

1.39 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.66 g/cm³

Surface Gravity

1.14 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.441

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

#223of 570

top 38.9%

This planet

1.10R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-392 c 1.10 R⊕ Kepler-59 b 1.10 R⊕ K2-239 d 1.10 R⊕

Metric	Earth	Kepler-1966 b	Jupiter
Radius (R⊕)	1.00	1.10	11.21
Mass (M⊕)	1.00	1.39	317.83
Density (g/cm³)	5.51	5.66	1.33
Surface Gravity (g)	1.00	1.14	2.53
Insolation (S⊕)	1.00	68.28	0.037

Star Catalogue Identifiers

TIC

TIC 137627194

Gaia DR2

Gaia DR2 2053614049674000512

Gaia DR3

Gaia DR3 2053614049674000512

System

Kepler-1966

Percentile among Rocky Terrestrial cohort

Radius 1.105 R⊕ · percentile 61 / cohort 570

Mass 1.390 M⊕ · percentile 56 / cohort 570

Orbital period 8.62 d · percentile 75 / cohort 567

Distance 484.60 pc · percentile 62 / cohort 566

ESI 0.441 · percentile 65 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

8.617 days

Semi-major axis

0.0763 AU

Eccentricity

0.000

Inclination

89.86 °

Year Length

A year here lasts approximately 8.62 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0763 AU.

Transit Fingerprint

Depth

0.015 %

Duration

2.713 h

Impact parameter b

0.340

Rp / R★

0.011203

Transit midpoint (BJD)

2,454,966.5169

Photometric dip

Transit produces a flux drop of 151 ppm lasting ≈ 2.71 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011203

Semi-major axis / stellar radius

24.500

Impact parameter (b)

0.340

Transit mid-time (BJD)

2,454,966.5169

Angular separation (arcsec)

0.15700

Eq. Temperature

733K

(460 °C)

Insolation (S⊕)

68.28

Earth = 1.00

Earth Similarity (ESI)

0.441

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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-1966

Spectral Class

K-type orange

Effective Temperature

5,009 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.840 R☉

Stellar Mass

0.797 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.491 dex

Stellar density

3.747 g/cm³

Metallicity ratio

[Fe/H]

Distance

484.60 parsec

Light-years 1,580.56 ly

V-band magnitude

15.22 mag

Voyager-speed travel 27,873,090 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.037 mas

Total Proper Motion

12.265 mas/yr

PM Right Ascension

-12.03 mas/yr

PM Declination

-2.37 mas/yr

Galactic Cartesian (pc)

x = 0.287 · y = -0.694 · z = 0.660

Equatorial (J2000)

RA 292.46378° · Dec 41.29904°

Galactic ℓ, b

73.959° · 10.917°

Ecliptic λ, β

307.471° · 61.847°

HTM-20 index

-428359962