Key parameters at a glance

A radius of 3.18 Earth radii
A mass of 10.20 Earth masses
Surface gravity around 1.01 g
An orbital period of 59.771 days
Semi-major axis 0.2950 AU
Equilibrium temperature 522 K (249 °C)
Distance from Earth 2,663.36 light-years
Earth Similarity Index 0.434
Travel time at Voyager 1 speed 46,968,418 years

Kepler-1774 b Planet Profile

Physical Specs

Radius

3.18 R⊕

Radius (Jupiter)

0.284 R♃

Mass

10.20 M⊕

Mass (Jupiter)

0.032 M♃

Density

1.74 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.434

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

#365of 1978

top 18.4%

This planet

3.18R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1736 b 3.18 R⊕ TOI-2458 c 3.18 R⊕ NGTS-4 b 3.18 R⊕

Metric	Earth	Kepler-1774 b	Jupiter
Radius (R⊕)	1.00	3.18	11.21
Mass (M⊕)	1.00	10.20	317.83
Density (g/cm³)	5.51	1.74	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	16.40	0.037

Star Catalogue Identifiers

TIC

TIC 121660779

Gaia DR2

Gaia DR2 2102110724433416960

Gaia DR3

Gaia DR3 2102110724433416960

System

Kepler-1774

Percentile among Sub-Neptune cohort

Radius 3.182 R⊕ · percentile 82 / cohort 1978

Mass 10.200 M⊕ · percentile 74 / cohort 1978

Orbital period 59.77 d · percentile 89 / cohort 1946

Distance 816.59 pc · percentile 66 / cohort 1975

ESI 0.434 · percentile 59 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

59.771 days

Semi-major axis

0.2950 AU

Eccentricity

0.000

Inclination

88.90 °

Year Length

A year here lasts approximately 59.77 Earth days (16.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2950 AU.

Transit Fingerprint

Depth

0.057 %

Duration

4.494 h

Impact parameter b

0.741

Rp / R★

0.023538

Transit midpoint (BJD)

2,454,981.9696

Photometric dip

Transit produces a flux drop of 566 ppm lasting ≈ 4.49 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023538

Semi-major axis / stellar radius

46.600

Impact parameter (b)

0.741

Transit mid-time (BJD)

2,454,981.9696

Angular separation (arcsec)

0.36100

Eq. Temperature

522K

(249 °C)

Insolation (S⊕)

16.40

Earth = 1.00

Earth Similarity (ESI)

0.434

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-1774

Spectral Class

F-type yellow-white

Effective Temperature

6,214 K — hotter than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.122 R☉

Stellar Mass

1.101 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.382 dex

Stellar density

0.537 g/cm³

Metallicity ratio

[Fe/H]

Distance

816.59 parsec

Light-years 2,663.36 ly

V-band magnitude

14.02 mag

Voyager-speed travel 46,968,418 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.196 mas

Total Proper Motion

19.473 mas/yr

PM Right Ascension

-8.87 mas/yr

PM Declination

-17.34 mas/yr

Galactic Cartesian (pc)

x = 0.240 · y = -0.716 · z = 0.656

Equatorial (J2000)

RA 288.57440° · Dec 40.98861°

Galactic ℓ, b

72.381° · 13.426°

Ecliptic λ, β

301.289° · 62.425°

HTM-20 index

-1311661761