Key parameters at a glance

A radius of 1.02 Earth radii
A mass of 1.03 Earth masses
Surface gravity around 1.00 g
An orbital period of 8.689 days
Semi-major axis 0.0514 AU
Equilibrium temperature 307 K (34 °C)
Distance from Earth 300.69 light-years
Earth Similarity Index 0.951
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-1649b is an exoplanet orbiting the red dwarf star Kepler-1649, discovered in 2017. It is similar to Venus, but in the past it was thought to be a candidate for habitability.

Excerpted from Wikipedia · full article

1 sibling around Kepler-1649

Kepler-1649 b 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 this	Rocky Terrestrial	1.02	1.03	8.689	307	2017
Kepler-1649 c	Rocky Terrestrial	1.06	1.20	19.535	234	2020

Kepler-1649 b Planet Profile

Physical Specs

Radius

1.02 R⊕

Radius (Jupiter)

0.091 R♃

Mass

1.03 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.38 g/cm³

Surface Gravity

1.00 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.951

HZ Position Inner

Controversial No

Discovery

Year 2017

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#321of 570

top 56.1%

This planet

1.02R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

K2-415 b 1.02 R⊕ Kepler-336 b 1.02 R⊕ K2-136 b 1.01 R⊕

Metric	Earth	Kepler-1649 b	Jupiter
Radius (R⊕)	1.00	1.02	11.21
Mass (M⊕)	1.00	1.03	317.83
Density (g/cm³)	5.51	5.38	1.33
Surface Gravity (g)	1.00	1.00	2.53
Insolation (S⊕)	1.00	2.21	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 1.017 R⊕ · percentile 44 / cohort 570

Mass 1.030 M⊕ · percentile 39 / cohort 570

Orbital period 8.69 d · percentile 75 / cohort 567

Distance 92.19 pc · percentile 23 / cohort 566

ESI 0.951 · percentile 95 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

8.689 days

Semi-major axis

0.0514 AU

Eccentricity

0.000

Inclination

89.15 °

Year Length

A year here lasts approximately 8.69 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0514 AU.

Transit Fingerprint

Depth

0.178 %

Duration

1.184 h

Impact parameter b

0.650

Rp / R★

0.040200

Transit midpoint (BJD)

2,455,374.6219

Photometric dip

Transit produces a flux drop of 1,783 ppm lasting ≈ 1.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.040200

Semi-major axis / stellar radius

44.770

Impact parameter (b)

0.650

Transit mid-time (BJD)

2,455,374.6219

Angular separation (arcsec)

0.55800

Eq. Temperature

307K

(34 °C)

Insolation (S⊕)

2.21

Earth = 1.00

Earth Similarity (ESI)

0.951

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Angelo et al. 2017

Instrument

Kepler CCD Array

Publication

2017-04

Observation locale

Space

Discovery cohort

Planets confirmed in 2017 at Kepler (8 shown).

Kepler-1652 b · Super-Earth Kepler-1653 b · Sub-Neptune Kepler-1651 b · Super-Earth Kepler-150 f · Sub-Neptune Kepler-1650 b · Rocky Terrestrial Kepler-90 i · Super-Earth Kepler-80 g · Rocky Terrestrial Kepler-448 c · Gas Giant

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

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