Key parameters at a glance

A radius of 2.82 Earth radii
A mass of 8.37 Earth masses
Surface gravity around 1.05 g
An orbital period of 7.675 days
Semi-major axis 0.0781 AU
Equilibrium temperature 957 K (684 °C)
Distance from Earth 4,249.39 light-years
Earth Similarity Index 0.250
Travel time at Voyager 1 speed 74,937,965 years

Kepler-1738 b Planet Profile

Physical Specs

Radius

2.82 R⊕

Radius (Jupiter)

0.252 R♃

Mass

8.37 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.04 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.250

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

#719of 1978

top 36.3%

This planet

2.82R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-281 b 2.82 R⊕ Kepler-198 b 2.82 R⊕ Kepler-722 c 2.82 R⊕

Metric	Earth	Kepler-1738 b	Jupiter
Radius (R⊕)	1.00	2.82	11.21
Mass (M⊕)	1.00	8.37	317.83
Density (g/cm³)	5.51	2.04	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	198.67	0.037

Star Catalogue Identifiers

TIC

TIC 272080244

Gaia DR2

Gaia DR2 2080581565208813312

Gaia DR3

Gaia DR3 2080581565208813312

System

Kepler-1738

Percentile among Sub-Neptune cohort

Radius 2.825 R⊕ · percentile 64 / cohort 1978

Mass 8.370 M⊕ · percentile 58 / cohort 1978

Orbital period 7.67 d · percentile 25 / cohort 1946

Distance 1,302.87 pc · percentile 89 / cohort 1975

ESI 0.250 · percentile 16 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.675 days

Semi-major axis

0.0781 AU

Eccentricity

0.000

Inclination

85.69 °

Year Length

A year here lasts approximately 7.67 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0781 AU.

Transit Fingerprint

Depth

0.050 %

Duration

1.937 h

Impact parameter b

0.056

Rp / R★

0.021324

Transit midpoint (BJD)

2,454,966.2243

Photometric dip

Transit produces a flux drop of 503 ppm lasting ≈ 1.94 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021324

Semi-major axis / stellar radius

12.500

Impact parameter (b)

0.056

Transit mid-time (BJD)

2,454,966.2243

Angular separation (arcsec)

0.05990

Eq. Temperature

957K

(684 °C)

Insolation (S⊕)

198.67

Earth = 1.00

Earth Similarity (ESI)

0.250

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-1738

Spectral Class

F-type yellow-white

Effective Temperature

6,063 K — hotter than the Sun (5,778 K)

Estimated Age

0.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.001 R☉

Stellar Mass

1.079 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

0.628 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,302.87 parsec

Light-years 4,249.39 ly

V-band magnitude

15.65 mag

Voyager-speed travel 74,937,965 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.739 mas

Total Proper Motion

7.604 mas/yr

PM Right Ascension

-4.92 mas/yr

PM Declination

-5.80 mas/yr

Galactic Cartesian (pc)

x = 0.298 · y = -0.607 · z = 0.737

Equatorial (J2000)

RA 296.13135° · Dec 47.43881°

Galactic ℓ, b

80.744° · 11.400°

Ecliptic λ, β

318.432° · 66.538°

HTM-20 index

-2066680532