Key parameters at a glance

A radius of 2.03 Earth radii
A mass of 4.78 Earth masses
Surface gravity around 1.16 g
An orbital period of 33.470 days
Semi-major axis 0.2006 AU
Equilibrium temperature 609 K (336 °C)
Distance from Earth 3,681.39 light-years
Earth Similarity Index 0.447
Travel time at Voyager 1 speed 64,921,274 years

Kepler-1155 b Planet Profile

Physical Specs

Radius

2.03 R⊕

Radius (Jupiter)

0.181 R♃

Mass

4.78 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.14 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.447

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

#1915of 1978

top 96.8%

This planet

2.03R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 2030 b 2.03 R⊕ Kepler-37 d 2.03 R⊕ Kepler-195 b 2.03 R⊕

Metric	Earth	Kepler-1155 b	Jupiter
Radius (R⊕)	1.00	2.03	11.21
Mass (M⊕)	1.00	4.78	317.83
Density (g/cm³)	5.51	3.14	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	32.52	0.037

Star Catalogue Identifiers

TIC

TIC 121785676

Gaia DR2

Gaia DR2 2099713617285398528

Gaia DR3

Gaia DR3 2099713617285398528

System

Kepler-1155

Percentile among Sub-Neptune cohort

Radius 2.030 R⊕ · percentile 3 / cohort 1978

Mass 4.780 M⊕ · percentile 5 / cohort 1978

Orbital period 33.47 d · percentile 76 / cohort 1946

Distance 1,128.72 pc · percentile 84 / cohort 1975

ESI 0.447 · percentile 62 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

33.470 days

Semi-major axis

0.2006 AU

Eccentricity

0.000

Inclination

88.22 °

Year Length

A year here lasts approximately 33.47 Earth days (9.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2006 AU.

Transit Fingerprint

Depth

0.037 %

Duration

4.513 h

Impact parameter b

0.079

Rp / R★

0.018028

Transit midpoint (BJD)

2,454,973.1510

Photometric dip

Transit produces a flux drop of 371 ppm lasting ≈ 4.51 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018028

Semi-major axis / stellar radius

57.510

Impact parameter (b)

0.079

Transit mid-time (BJD)

2,454,973.1510

Angular separation (arcsec)

0.17800

Eq. Temperature

609K

(336 °C)

Insolation (S⊕)

32.52

Earth = 1.00

Earth Similarity (ESI)

0.447

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-1155

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,842 K — hotter than the Sun (5,778 K)

Estimated Age

3.72 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.030 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.430 dex

Stellar density

3.212 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,128.72 parsec

Light-years 3,681.39 ly

V-band magnitude

14.80 mag

Voyager-speed travel 64,921,274 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

0.659 mas

Total Proper Motion

7.477 mas/yr

PM Right Ascension

1.56 mas/yr

PM Declination

7.31 mas/yr

Galactic Cartesian (pc)

x = 0.249 · y = -0.730 · z = 0.636

Equatorial (J2000)

RA 288.82061° · Dec 39.52287°

Galactic ℓ, b

71.094° · 12.644°

Ecliptic λ, β

300.839° · 60.962°

HTM-20 index

-87640572