Key parameters at a glance

A radius of 2.29 Earth radii
A mass of 5.86 Earth masses
Surface gravity around 1.12 g
An orbital period of 94.289 days
Semi-major axis 0.3856 AU
Equilibrium temperature 369 K (96 °C)
Distance from Earth 2,034.25 light-years
Earth Similarity Index 0.661
Travel time at Voyager 1 speed 35,874,077 years

Kepler-1227 b Planet Profile

Physical Specs

Radius

2.29 R⊕

Radius (Jupiter)

0.204 R♃

Mass

5.86 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.68 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.661

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

#1519of 1978

top 76.7%

This planet

2.29R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-379 c 2.29 R⊕ Kepler-319 d 2.29 R⊕ Kepler-626 b 2.29 R⊕

Metric	Earth	Kepler-1227 b	Jupiter
Radius (R⊕)	1.00	2.29	11.21
Mass (M⊕)	1.00	5.86	317.83
Density (g/cm³)	5.51	2.68	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	4.18	0.037

Star Catalogue Identifiers

TIC

TIC 121113728

Gaia DR2

Gaia DR2 2102431713108873216

Gaia DR3

Gaia DR3 2102431713108873216

System

Kepler-1227

Percentile among Sub-Neptune cohort

Radius 2.290 R⊕ · percentile 23 / cohort 1978

Mass 5.860 M⊕ · percentile 22 / cohort 1978

Orbital period 94.29 d · percentile 93 / cohort 1946

Distance 623.71 pc · percentile 54 / cohort 1975

ESI 0.661 · percentile 89 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

94.289 days

Semi-major axis

0.3856 AU

Eccentricity

0.000

Inclination

89.75 °

Year Length

A year here lasts approximately 94.29 Earth days (25.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3856 AU.

Transit Fingerprint

Depth

0.051 %

Duration

4.144 h

Impact parameter b

0.620

Rp / R★

0.021983

Transit midpoint (BJD)

2,454,999.5130

Photometric dip

Transit produces a flux drop of 505 ppm lasting ≈ 4.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021983

Semi-major axis / stellar radius

143.400

Impact parameter (b)

0.620

Transit mid-time (BJD)

2,454,999.5130

Angular separation (arcsec)

0.61800

Eq. Temperature

369K

(96 °C)

Insolation (S⊕)

4.18

Earth = 1.00

Earth Similarity (ESI)

0.661

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-1227

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,747 K — cooler than the Sun (5,778 K)

Estimated Age

4.17 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.950 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

-0.04

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.130 g/cm³

Metallicity ratio

[Fe/H]

Distance

623.71 parsec

Light-years 2,034.25 ly

V-band magnitude

14.28 mag

Voyager-speed travel 35,874,077 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.575 mas

Total Proper Motion

12.201 mas/yr

PM Right Ascension

6.99 mas/yr

PM Declination

10.00 mas/yr

Galactic Cartesian (pc)

x = 0.219 · y = -0.712 · z = 0.668

Equatorial (J2000)

RA 287.06641° · Dec 41.87497°

Galactic ℓ, b

72.744° · 14.819°

Ecliptic λ, β

299.413° · 63.582°

HTM-20 index

-2019251193