Key parameters at a glance

A radius of 2.07 Earth radii
A mass of 4.94 Earth masses
Surface gravity around 1.15 g
An orbital period of 11.120 days
Semi-major axis 0.0911 AU
Equilibrium temperature 649 K (376 °C)
Distance from Earth 1,196.99 light-years
Earth Similarity Index 0.418
Travel time at Voyager 1 speed 21,108,962 years

Kepler-477 b Planet Profile

Physical Specs

Radius

2.07 R⊕

Radius (Jupiter)

0.185 R♃

Mass

4.94 M⊕

Mass (Jupiter)

0.016 M♃

Density

3.06 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.418

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

#1860of 1978

top 94.0%

This planet

2.07R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-262 b 2.07 R⊕ Kepler-654 b 2.07 R⊕ Kepler-988 b 2.07 R⊕

Metric	Earth	Kepler-477 b	Jupiter
Radius (R⊕)	1.00	2.07	11.21
Mass (M⊕)	1.00	4.94	317.83
Density (g/cm³)	5.51	3.06	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	38.71	0.037

Star Catalogue Identifiers

TIC

TIC 158633329

System

Kepler-477

Percentile among Sub-Neptune cohort

Radius 2.070 R⊕ · percentile 6 / cohort 1978

Mass 4.940 M⊕ · percentile 7 / cohort 1978

Orbital period 11.12 d · percentile 39 / cohort 1946

Distance 367.00 pc · percentile 39 / cohort 1975

ESI 0.418 · percentile 56 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

11.120 days

Semi-major axis

0.0911 AU

Eccentricity

0.000

Inclination

87.75 °

Year Length

A year here lasts approximately 11.12 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0911 AU.

Transit Fingerprint

Depth

0.064 %

Duration

3.330 h

Impact parameter b

0.680

Rp / R★

0.023984

Transit midpoint (BJD)

2,454,972.7529

Photometric dip

Transit produces a flux drop of 636 ppm lasting ≈ 3.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023984

Semi-major axis / stellar radius

19.700

Impact parameter (b)

0.680

Transit mid-time (BJD)

2,454,972.7529

Angular separation (arcsec)

0.24800

Eq. Temperature

649K

(376 °C)

Insolation (S⊕)

38.71

Earth = 1.00

Earth Similarity (ESI)

0.418

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-477

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

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

Estimated Age

2.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.790 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

1.446 g/cm³

Metallicity ratio

[Fe/H]

Distance

367.00 parsec

Light-years 1,196.99 ly

V-band magnitude

13.84 mag

Voyager-speed travel 21,108,962 yr

Multi-band Host Photometry — 15 bands

Astrometric Data

Total Proper Motion

26.700 mas/yr

PM Right Ascension

-26.00 mas/yr

PM Declination

-6.00 mas/yr

Galactic Cartesian (pc)

x = 0.229 · y = -0.703 · z = 0.674

Equatorial (J2000)

RA 288.06745° · Dec 42.35531°

Galactic ℓ, b

73.506° · 14.330°

Ecliptic λ, β

301.321° · 63.843°

HTM-20 index

-1968935374