Key parameters at a glance

A radius of 1.13 Earth radii
A mass of 1.51 Earth masses
Surface gravity around 1.18 g
An orbital period of 6.306 days
Semi-major axis 0.0657 AU
Equilibrium temperature 1,125 K (852 °C)
Distance from Earth 1,663.49 light-years
Earth Similarity Index 0.278
Travel time at Voyager 1 speed 29,335,648 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1577 b Planet Profile

Physical Specs

Radius

1.13 R⊕

Radius (Jupiter)

0.101 R♃

Mass

1.51 M⊕

Mass (Jupiter)

0.005 M♃

Density

5.75 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.278

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#180of 570

top 31.4%

This planet

1.13R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TOI-1450 A c 1.13 R⊕ Kepler-250 b 1.13 R⊕ Kepler-887 c 1.13 R⊕

Metric	Earth	Kepler-1577 b	Jupiter
Radius (R⊕)	1.00	1.13	11.21
Mass (M⊕)	1.00	1.51	317.83
Density (g/cm³)	5.51	5.75	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	57.75	0.037

Star Catalogue Identifiers

TIC

TIC 240177285

Gaia DR2

Gaia DR2 2128481789271221632

Gaia DR3

Gaia DR3 2128481789271221632

System

Kepler-1577

Percentile among Rocky Terrestrial cohort

Radius 1.130 R⊕ · percentile 66 / cohort 570

Mass 1.510 M⊕ · percentile 62 / cohort 570

Orbital period 6.31 d · percentile 63 / cohort 567

Distance 510.03 pc · percentile 65 / cohort 566

ESI 0.278 · percentile 31 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

6.306 days

Semi-major axis

0.0657 AU

Eccentricity

0.000

Inclination

87.71 °

Year Length

A year here lasts approximately 6.31 Earth days (1.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0657 AU.

Transit Fingerprint

Depth

0.022 %

Duration

2.468 h

Impact parameter b

0.542

Rp / R★

0.013838

Transit midpoint (BJD)

2,454,964.5311

Photometric dip

Transit produces a flux drop of 221 ppm lasting ≈ 2.47 h.

Extended Orbital Architecture

Planet / star radius ratio

0.013838

Semi-major axis / stellar radius

15.020

Impact parameter (b)

0.542

Transit mid-time (BJD)

2,454,964.5311

Angular separation (arcsec)

0.12900

Eq. Temperature

1,125K

(852 °C)

Insolation (S⊕)

57.75

Earth = 1.00

Earth Similarity (ESI)

0.278

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-1577

Spectral Class

K-type orange

Effective Temperature

4,862 K — cooler than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.740 R☉

Stellar Mass

0.780 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.600 dex

Stellar density

2.230 g/cm³

Metallicity ratio

[Fe/H]

Distance

510.03 parsec

Light-years 1,663.49 ly

V-band magnitude

15.23 mag

Voyager-speed travel 29,335,648 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.932 mas

Total Proper Motion

14.629 mas/yr

PM Right Ascension

-3.61 mas/yr

PM Declination

-14.18 mas/yr

Galactic Cartesian (pc)

x = 0.263 · y = -0.621 · z = 0.738

Equatorial (J2000)

RA 292.95527° · Dec 47.57304°

Galactic ℓ, b

79.875° · 13.375°

Ecliptic λ, β

313.592° · 67.569°

HTM-20 index

-615054002