Key parameters at a glance

A radius of 1.90 Earth radii
A mass of 4.27 Earth masses
Surface gravity around 1.18 g
An orbital period of 106.248 days
Semi-major axis 0.4301 AU
Equilibrium temperature 377 K (104 °C)
Distance from Earth 4,239.93 light-years
Earth Similarity Index 0.695
Travel time at Voyager 1 speed 74,771,164 years

Kepler-1177 b Planet Profile

Physical Specs

Radius

1.90 R⊕

Radius (Jupiter)

0.170 R♃

Mass

4.27 M⊕

Mass (Jupiter)

0.013 M♃

Density

3.42 g/cm³

Surface Gravity

1.18 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.695

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

#125of 1176

top 10.5%

This planet

1.90R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-158 c 1.90 R⊕ Kepler-349 b 1.90 R⊕ Kepler-196 b 1.90 R⊕

Metric	Earth	Kepler-1177 b	Jupiter
Radius (R⊕)	1.00	1.90	11.21
Mass (M⊕)	1.00	4.27	317.83
Density (g/cm³)	5.51	3.42	1.33
Surface Gravity (g)	1.00	1.18	2.53
Insolation (S⊕)	1.00	11.86	0.037

Star Catalogue Identifiers

TIC

TIC 399826020

Gaia DR2

Gaia DR2 2131318426189833728

Gaia DR3

Gaia DR3 2131318426189833728

System

Kepler-1177

Percentile among Super-Earth cohort

Radius 1.900 R⊕ · percentile 88 / cohort 1176

Mass 4.270 M⊕ · percentile 81 / cohort 1176

Orbital period 106.25 d · percentile 99 / cohort 1164

Distance 1,299.97 pc · percentile 91 / cohort 1171

ESI 0.695 · percentile 85 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

106.248 days

Semi-major axis

0.4301 AU

Eccentricity

0.000

Inclination

89.32 °

Year Length

A year here lasts approximately 106.25 Earth days (29.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4301 AU.

Transit Fingerprint

Depth

0.040 %

Duration

13.668 h

Impact parameter b

0.539

Rp / R★

0.018235

Transit midpoint (BJD)

2,454,968.7451

Photometric dip

Transit produces a flux drop of 397 ppm lasting ≈ 13.67 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018235

Semi-major axis / stellar radius

58.850

Impact parameter (b)

0.539

Transit mid-time (BJD)

2,454,968.7451

Angular separation (arcsec)

0.33100

Eq. Temperature

377K

(104 °C)

Insolation (S⊕)

11.86

Earth = 1.00

Earth Similarity (ESI)

0.695

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-1177

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,712 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.970 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

0.342 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,299.97 parsec

Light-years 4,239.93 ly

V-band magnitude

14.77 mag

Voyager-speed travel 74,771,164 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.740 mas

Total Proper Motion

2.900 mas/yr

PM Right Ascension

2.11 mas/yr

PM Declination

-1.99 mas/yr

Galactic Cartesian (pc)

x = 0.187 · y = -0.623 · z = 0.759

Equatorial (J2000)

RA 286.67148° · Dec 49.40630°

Galactic ℓ, b

79.903° · 17.924°

Ecliptic λ, β

304.670° · 70.845°

HTM-20 index

808755205