Key parameters at a glance

A radius of 2.18 Earth radii
A mass of 5.38 Earth masses
Surface gravity around 1.13 g
An orbital period of 49.478 days
Semi-major axis 0.2587 AU
Equilibrium temperature 462 K (189 °C)
Distance from Earth 2,183.85 light-years
Earth Similarity Index 0.560
Travel time at Voyager 1 speed 38,512,237 years

Kepler-1742 b Planet Profile

Physical Specs

Radius

2.18 R⊕

Radius (Jupiter)

0.194 R♃

Mass

5.38 M⊕

Mass (Jupiter)

0.017 M♃

Density

2.86 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.560

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

#1719of 1978

top 86.9%

This planet

2.18R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-261 b 2.18 R⊕ Kepler-250 d 2.18 R⊕ GJ 3090 b 2.18 R⊕

Metric	Earth	Kepler-1742 b	Jupiter
Radius (R⊕)	1.00	2.18	11.21
Mass (M⊕)	1.00	5.38	317.83
Density (g/cm³)	5.51	2.86	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	10.73	0.037

Star Catalogue Identifiers

TIC

TIC 158326424

Gaia DR2

Gaia DR2 2106221351731318784

Gaia DR3

Gaia DR3 2106221351731318784

System

Kepler-1742

Percentile among Sub-Neptune cohort

Radius 2.178 R⊕ · percentile 13 / cohort 1978

Mass 5.380 M⊕ · percentile 14 / cohort 1978

Orbital period 49.48 d · percentile 85 / cohort 1946

Distance 669.57 pc · percentile 58 / cohort 1975

ESI 0.560 · percentile 78 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

49.478 days

Semi-major axis

0.2587 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 49.48 Earth days (13.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2587 AU.

Transit Fingerprint

Depth

0.052 %

Duration

2.479 h

Impact parameter b

0.048

Rp / R★

0.020297

Transit midpoint (BJD)

2,454,974.8245

Photometric dip

Transit produces a flux drop of 520 ppm lasting ≈ 2.48 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020297

Semi-major axis / stellar radius

154.500

Impact parameter (b)

0.048

Transit mid-time (BJD)

2,454,974.8245

Angular separation (arcsec)

0.38600

Eq. Temperature

462K

(189 °C)

Insolation (S⊕)

10.73

Earth = 1.00

Earth Similarity (ESI)

0.560

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-1742

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,776 K — cooler than the Sun (5,778 K)

Estimated Age

0.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.849 R☉

Stellar Mass

0.939 M☉

Metallicity [Fe/H]

-0.18

Extended Stellar Properties

Surface gravity (log g)

4.554 dex

Stellar density

28.511 g/cm³

Metallicity ratio

[Fe/H]

Distance

669.57 parsec

Light-years 2,183.85 ly

V-band magnitude

14.51 mag

Voyager-speed travel 38,512,237 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.465 mas

Total Proper Motion

8.700 mas/yr

PM Right Ascension

-3.82 mas/yr

PM Declination

-7.82 mas/yr

Galactic Cartesian (pc)

x = 0.206 · y = -0.676 · z = 0.707

Equatorial (J2000)

RA 286.96681° · Dec 44.99243°

Galactic ℓ, b

75.694° · 16.099°

Ecliptic λ, β

301.300° · 66.597°

HTM-20 index

-1890968693