Key parameters at a glance

A radius of 2.43 Earth radii
A mass of 6.48 Earth masses
Surface gravity around 1.10 g
An orbital period of 7.344 days
Semi-major axis 0.0697 AU
Equilibrium temperature 839 K (566 °C)
Distance from Earth 2,555.97 light-years
Earth Similarity Index 0.305
Travel time at Voyager 1 speed 45,074,593 years

Kepler-1739 b Planet Profile

Physical Specs

Radius

2.43 R⊕

Radius (Jupiter)

0.217 R♃

Mass

6.48 M⊕

Mass (Jupiter)

0.020 M♃

Density

2.48 g/cm³

Surface Gravity

1.10 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.305

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

#1280of 1978

top 64.7%

This planet

2.43R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-233 b 2.43 R⊕ Kepler-55 b 2.43 R⊕ TOI-4184 b 2.43 R⊕

Metric	Earth	Kepler-1739 b	Jupiter
Radius (R⊕)	1.00	2.43	11.21
Mass (M⊕)	1.00	6.48	317.83
Density (g/cm³)	5.51	2.48	1.33
Surface Gravity (g)	1.00	1.10	2.53
Insolation (S⊕)	1.00	117.50	0.037

Star Catalogue Identifiers

TIC

TIC 272279981

Gaia DR2

Gaia DR2 2080638877253151232

Gaia DR3

Gaia DR3 2080638877253151232

System

Kepler-1739

Percentile among Sub-Neptune cohort

Radius 2.431 R⊕ · percentile 35 / cohort 1978

Mass 6.480 M⊕ · percentile 33 / cohort 1978

Orbital period 7.34 d · percentile 24 / cohort 1946

Distance 783.67 pc · percentile 64 / cohort 1975

ESI 0.305 · percentile 29 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.344 days

Semi-major axis

0.0697 AU

Eccentricity

0.000

Inclination

89.78 °

Year Length

A year here lasts approximately 7.34 Earth days (2.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0697 AU.

Transit Fingerprint

Depth

0.057 %

Duration

1.145 h

Impact parameter b

0.061

Rp / R★

0.022075

Transit midpoint (BJD)

2,454,970.3005

Photometric dip

Transit produces a flux drop of 574 ppm lasting ≈ 1.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.022075

Semi-major axis / stellar radius

50.030

Impact parameter (b)

0.061

Transit mid-time (BJD)

2,454,970.3005

Angular separation (arcsec)

0.08890

Eq. Temperature

839K

(566 °C)

Insolation (S⊕)

117.50

Earth = 1.00

Earth Similarity (ESI)

0.305

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-1739

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,757 K — cooler than the Sun (5,778 K)

Estimated Age

0.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.762 R☉

Stellar Mass

0.865 M☉

Metallicity [Fe/H]

-0.50

Extended Stellar Properties

Surface gravity (log g)

4.597 dex

Stellar density

38.441 g/cm³

Metallicity ratio

[Fe/H]

Distance

783.67 parsec

Light-years 2,555.97 ly

V-band magnitude

14.90 mag

Voyager-speed travel 45,074,593 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.248 mas

Total Proper Motion

20.544 mas/yr

PM Right Ascension

-6.94 mas/yr

PM Declination

-19.34 mas/yr

Galactic Cartesian (pc)

x = 0.298 · y = -0.604 · z = 0.739

Equatorial (J2000)

RA 296.23205° · Dec 47.67886°

Galactic ℓ, b

80.993° · 11.453°

Ecliptic λ, β

318.854° · 66.723°

HTM-20 index

1210318823