Key parameters at a glance

A radius of 1.06 Earth radii
A mass of 1.20 Earth masses
Surface gravity around 1.07 g
An orbital period of 19.535 days
Semi-major axis 0.0649 AU
Equilibrium temperature 234 K (-39 °C)
Distance from Earth 300.69 light-years
Earth Similarity Index 0.850
Travel time at Voyager 1 speed 5,302,623 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

Kepler-1649c is an Earth-sized exoplanet, likely rocky, orbiting within the habitable zone of the red dwarf star Kepler-1649, the outermost planet of the planetary system discovered by Kepler’s space telescope. It is located about 301 light-years (92 pc) away from Earth, in the constellation of Cygnus.

Excerpted from Wikipedia · full article

1 sibling around Kepler-1649

Kepler-1649 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-1649 b	Rocky Terrestrial	1.02	1.03	8.689	307	2017
Kepler-1649 c this	Rocky Terrestrial	1.06	1.20	19.535	234	2020

Kepler-1649 c Planet Profile

Physical Specs

Radius

1.06 R⊕

Radius (Jupiter)

0.095 R♃

Mass

1.20 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.54 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.850

HZ Position Habitable

Controversial No

Discovery

Year 2020

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#270of 570

top 47.2%

This planet

1.06R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1200 b 1.06 R⊕ Kepler-316 b 1.06 R⊕ Kepler-1203 b 1.06 R⊕

Metric	Earth	Kepler-1649 c	Jupiter
Radius (R⊕)	1.00	1.06	11.21
Mass (M⊕)	1.00	1.20	317.83
Density (g/cm³)	5.51	5.54	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	0.75	0.037

Star Catalogue Identifiers

TIC

TIC 137558813

Gaia DR2

Gaia DR2 2125699062780742016

Gaia DR3

Gaia DR3 2125699062780742016

System

Kepler-1649

Percentile among Rocky Terrestrial cohort

Radius 1.060 R⊕ · percentile 51 / cohort 570

Mass 1.200 M⊕ · percentile 46 / cohort 570

Orbital period 19.54 d · percentile 91 / cohort 567

Distance 92.19 pc · percentile 23 / cohort 566

ESI 0.850 · percentile 89 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

19.535 days

Semi-major axis

0.0649 AU

Eccentricity

0.000

Inclination

89.34 °

Year Length

A year here lasts approximately 19.54 Earth days (5.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0649 AU.

Transit Fingerprint

Depth

0.173 %

Duration

1.070 h

Impact parameter b

0.875

Rp / R★

0.042000

Transit midpoint (BJD)

2,455,410.9777

Photometric dip

Transit produces a flux drop of 1,732 ppm lasting ≈ 1.07 h.

Extended Orbital Architecture

Planet / star radius ratio

0.042000

Semi-major axis / stellar radius

76.800

Impact parameter (b)

0.875

Transit mid-time (BJD)

2,455,410.9777

Angular separation (arcsec)

0.70400

Eq. Temperature

234K

(-39 °C)

Insolation (S⊕)

0.75

Earth = 1.00

Earth Similarity (ESI)

0.850

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — surface water would be frozen. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Vanderburg et al. 2020

Instrument

Kepler CCD Array

Publication

2020-04

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Kepler (12 shown).

Kepler-1701 b · Sub-Neptune Kepler-1690 b · Sub-Neptune Kepler-1700 b · Sub-Neptune Kepler-1684 b · Sub-Neptune Kepler-1678 b · Sub-Neptune Kepler-598 c · Sub-Neptune Kepler-1661 b · Sub-Neptune Kepler-1663 b · Sub-Neptune Kepler-1681 b · Sub-Neptune Kepler-1672 b · Sub-Neptune Kepler-1702 b · Super-Earth Kepler-1674 b · Sub-Neptune

Host System: Kepler-1649

Spectral Class

M-type red dwarf

Effective Temperature

3,240 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.232 R☉

Stellar Mass

0.198 M☉

Metallicity [Fe/H]

-0.15

Extended Stellar Properties

Surface gravity (log g)

5.004 dex

Stellar density

22.920 g/cm³

Metallicity ratio

[M/H]

Distance

92.19 parsec

Light-years 300.69 ly

V-band magnitude

17.95 mag

Voyager-speed travel 5,302,623 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

10.819 mas

Total Proper Motion

168.226 mas/yr

PM Right Ascension

-135.84 mas/yr

PM Declination

-99.23 mas/yr

Galactic Cartesian (pc)

x = 0.285 · y = -0.688 · z = 0.667

Equatorial (J2000)

RA 292.50297° · Dec 41.82999°

Galactic ℓ, b

74.456° · 11.129°

Ecliptic λ, β

307.899° · 62.340°

HTM-20 index

-439453126

Wikipedia → Image: Wikimedia Commons · NASA/Ames Research Center/Daniel Rutter · Public domain