Key parameters at a glance

A radius of 3.17 Earth radii
A mass of 10.20 Earth masses
Surface gravity around 1.01 g
An orbital period of 9.029 days
Semi-major axis 0.0796 AU
Equilibrium temperature 757 K (484 °C)
Distance from Earth 2,916.44 light-years
Earth Similarity Index 0.304
Travel time at Voyager 1 speed 51,431,497 years

Kepler-1727 b Planet Profile

Physical Specs

Radius

3.17 R⊕

Radius (Jupiter)

0.283 R♃

Mass

10.20 M⊕

Mass (Jupiter)

0.032 M♃

Density

1.75 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.304

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#375of 1978

top 18.9%

This planet

3.17R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-204 b 3.17 R⊕ K2-186 b 3.17 R⊕ Kepler-253 d 3.17 R⊕

Metric	Earth	Kepler-1727 b	Jupiter
Radius (R⊕)	1.00	3.17	11.21
Mass (M⊕)	1.00	10.20	317.83
Density (g/cm³)	5.51	1.75	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	77.75	0.037

Star Catalogue Identifiers

TIC

TIC 122376998

Gaia DR2

Gaia DR2 2052880194379878272

Gaia DR3

Gaia DR3 2052880194379878272

System

Kepler-1727

Percentile among Sub-Neptune cohort

Radius 3.173 R⊕ · percentile 81 / cohort 1978

Mass 10.200 M⊕ · percentile 74 / cohort 1978

Orbital period 9.03 d · percentile 30 / cohort 1946

Distance 894.19 pc · percentile 72 / cohort 1975

ESI 0.304 · percentile 29 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.029 days

Semi-major axis

0.0796 AU

Eccentricity

0.000

Inclination

89.94 °

Year Length

A year here lasts approximately 9.03 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0796 AU.

Transit Fingerprint

Depth

0.102 %

Duration

3.132 h

Impact parameter b

0.021

Rp / R★

0.030346

Transit midpoint (BJD)

2,455,010.2042

Photometric dip

Transit produces a flux drop of 1,020 ppm lasting ≈ 3.13 h.

Extended Orbital Architecture

Planet / star radius ratio

0.030346

Semi-major axis / stellar radius

22.690

Impact parameter (b)

0.021

Transit mid-time (BJD)

2,455,010.2042

Angular separation (arcsec)

0.08900

Eq. Temperature

757K

(484 °C)

Insolation (S⊕)

77.75

Earth = 1.00

Earth Similarity (ESI)

0.304

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1727

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,349 K — cooler than the Sun (5,778 K)

Estimated Age

9.70 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.824 M☉

Metallicity [Fe/H]

-0.12

Extended Stellar Properties

Surface gravity (log g)

4.526 dex

Stellar density

2.666 g/cm³

Metallicity ratio

[Fe/H]

Distance

894.19 parsec

Light-years 2,916.44 ly

V-band magnitude

15.75 mag

Voyager-speed travel 51,431,497 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.090 mas

Total Proper Motion

8.853 mas/yr

PM Right Ascension

-0.78 mas/yr

PM Declination

8.82 mas/yr

Galactic Cartesian (pc)

x = 0.271 · y = -0.732 · z = 0.626

Equatorial (J2000)

RA 290.33361° · Dec 38.72827°

Galactic ℓ, b

70.875° · 11.243°

Ecliptic λ, β

302.694° · 59.880°

HTM-20 index

1881890255