Key parameters at a glance

A radius of 2.81 Earth radii
A mass of 8.31 Earth masses
Surface gravity around 1.05 g
An orbital period of 16.720 days
Semi-major axis 0.1326 AU
Equilibrium temperature 767 K (494 °C)
Distance from Earth 1,822.08 light-years
Earth Similarity Index 0.316
Travel time at Voyager 1 speed 32,132,326 years

Kepler-1725 b Planet Profile

Physical Specs

Radius

2.81 R⊕

Radius (Jupiter)

0.251 R♃

Mass

8.31 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.05 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.316

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

#730of 1978

top 36.9%

This planet

2.81R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1690 b 2.81 R⊕ Kepler-1897 b 2.81 R⊕ Kepler-1234 b 2.81 R⊕

Metric	Earth	Kepler-1725 b	Jupiter
Radius (R⊕)	1.00	2.81	11.21
Mass (M⊕)	1.00	8.31	317.83
Density (g/cm³)	5.51	2.05	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	84.10	0.037

Star Catalogue Identifiers

TIC

TIC 377908774

Gaia DR2

Gaia DR2 2076524710904427520

Gaia DR3

Gaia DR3 2076524710904427520

System

Kepler-1725

Percentile among Sub-Neptune cohort

Radius 2.813 R⊕ · percentile 63 / cohort 1978

Mass 8.310 M⊕ · percentile 58 / cohort 1978

Orbital period 16.72 d · percentile 56 / cohort 1946

Distance 558.65 pc · percentile 50 / cohort 1975

ESI 0.316 · percentile 32 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

16.720 days

Semi-major axis

0.1326 AU

Eccentricity

0.000

Inclination

89.30 °

Year Length

A year here lasts approximately 16.72 Earth days (4.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1326 AU.

Transit Fingerprint

Depth

0.053 %

Duration

3.294 h

Impact parameter b

0.023

Rp / R★

0.021061

Transit midpoint (BJD)

2,455,004.4010

Photometric dip

Transit produces a flux drop of 531 ppm lasting ≈ 3.29 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021061

Semi-major axis / stellar radius

39.585

Impact parameter (b)

0.023

Transit mid-time (BJD)

2,455,004.4010

Angular separation (arcsec)

0.23700

Eq. Temperature

767K

(494 °C)

Insolation (S⊕)

84.10

Earth = 1.00

Earth Similarity (ESI)

0.316

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

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-1725

Spectral Class

F-type yellow-white

Effective Temperature

6,020 K — hotter than the Sun (5,778 K)

Estimated Age

0.89 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.085 R☉

Stellar Mass

1.049 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.389 dex

Stellar density

3.042 g/cm³

Metallicity ratio

[Fe/H]

Distance

558.65 parsec

Light-years 1,822.08 ly

V-band magnitude

13.15 mag

Voyager-speed travel 32,132,326 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.761 mas

Total Proper Motion

0.693 mas/yr

PM Right Ascension

0.13 mas/yr

PM Declination

0.68 mas/yr

Galactic Cartesian (pc)

x = 0.315 · y = -0.696 · z = 0.645

Equatorial (J2000)

RA 294.37355° · Dec 40.19463°

Galactic ℓ, b

73.637° · 9.125°

Ecliptic λ, β

309.552° · 60.330°

HTM-20 index

2075556250