Key parameters at a glance

A radius of 1.18 Earth radii
A mass of 1.76 Earth masses
Surface gravity around 1.26 g
An orbital period of 11.555 days
Semi-major axis 0.0911 AU
Equilibrium temperature 674 K (401 °C)
Distance from Earth 2,220.56 light-years
Earth Similarity Index 0.470
Travel time at Voyager 1 speed 39,159,598 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1477 b Planet Profile

Physical Specs

Radius

1.18 R⊕

Radius (Jupiter)

0.105 R♃

Mass

1.76 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.89 g/cm³

Surface Gravity

1.26 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.470

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

#117of 570

top 20.4%

This planet

1.18R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1430 b 1.18 R⊕ Kepler-1512 b 1.18 R⊕ Kepler-332 d 1.18 R⊕

Metric	Earth	Kepler-1477 b	Jupiter
Radius (R⊕)	1.00	1.18	11.21
Mass (M⊕)	1.00	1.76	317.83
Density (g/cm³)	5.51	5.89	1.33
Surface Gravity (g)	1.00	1.26	2.53
Insolation (S⊕)	1.00	78.16	0.037

Star Catalogue Identifiers

TIC

TIC 123314844

Gaia DR2

Gaia DR2 2116740104595955328

Gaia DR3

Gaia DR3 2116740104595955328

System

Kepler-1477

Percentile among Rocky Terrestrial cohort

Radius 1.180 R⊕ · percentile 77 / cohort 570

Mass 1.760 M⊕ · percentile 71 / cohort 570

Orbital period 11.56 d · percentile 82 / cohort 567

Distance 680.83 pc · percentile 78 / cohort 566

ESI 0.470 · percentile 68 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

11.555 days

Semi-major axis

0.0911 AU

Eccentricity

0.000

Inclination

83.66 °

Year Length

A year here lasts approximately 11.56 Earth days (3.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0911 AU.

Transit Fingerprint

Depth

0.025 %

Duration

2.799 h

Impact parameter b

0.261

Rp / R★

0.014364

Transit midpoint (BJD)

2,454,967.1308

Photometric dip

Transit produces a flux drop of 250 ppm lasting ≈ 2.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014364

Semi-major axis / stellar radius

8.700

Impact parameter (b)

0.261

Transit mid-time (BJD)

2,454,967.1308

Angular separation (arcsec)

0.13400

Eq. Temperature

674K

(401 °C)

Insolation (S⊕)

78.16

Earth = 1.00

Earth Similarity (ESI)

0.470

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

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-1477

Spectral Class

K-type orange

Effective Temperature

5,100 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.780 R☉

Stellar Mass

0.810 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

4.190 g/cm³

Systemic radial velocity

20.87 km/s

Rotational v·sin i

3.30 km/s

Metallicity ratio

[Fe/H]

Distance

680.83 parsec

Light-years 2,220.56 ly

V-band magnitude

14.72 mag

Voyager-speed travel 39,159,598 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.440 mas

Total Proper Motion

16.837 mas/yr

PM Right Ascension

1.58 mas/yr

PM Declination

-16.76 mas/yr

Galactic Cartesian (pc)

x = 0.144 · y = -0.721 · z = 0.678

Equatorial (J2000)

RA 281.29853° · Dec 42.68567°

Galactic ℓ, b

71.895° · 19.085°

Ecliptic λ, β

290.185° · 65.335°

HTM-20 index

-1776263536