Key parameters at a glance

A radius of 4.06 Earth radii
A mass of 15.50 Earth masses
Surface gravity around 0.94 g
An orbital period of 88.644 days
Semi-major axis 0.3815 AU
Equilibrium temperature 391 K (118 °C)
Distance from Earth 1,845.23 light-years
Earth Similarity Index 0.501
Travel time at Voyager 1 speed 32,540,701 years

Kepler-1771 b Planet Profile

Physical Specs

Radius

4.06 R⊕

Radius (Jupiter)

0.362 R♃

Mass

15.50 M⊕

Mass (Jupiter)

0.049 M♃

Density

1.28 g/cm³

Surface Gravity

0.94 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.501

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

#559of 574

top 97.2%

This planet

4.06R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-1472 b 4.06 R⊕ HD 190007 b 4.06 R⊕ Kepler-258 b 4.06 R⊕

Metric	Earth	Kepler-1771 b	Jupiter
Radius (R⊕)	1.00	4.06	11.21
Mass (M⊕)	1.00	15.50	317.83
Density (g/cm³)	5.51	1.28	1.33
Surface Gravity (g)	1.00	0.94	2.53
Insolation (S⊕)	1.00	5.51	0.037

Star Catalogue Identifiers

TIC

TIC 26583944

Gaia DR2

Gaia DR2 2129746468160336768

Gaia DR3

Gaia DR3 2129746468160336768

System

Kepler-1771

Percentile among Neptune-like cohort

Radius 4.055 R⊕ · percentile 3 / cohort 574

Mass 15.500 M⊕ · percentile 9 / cohort 574

Orbital period 88.64 d · percentile 80 / cohort 524

Distance 565.75 pc · percentile 59 / cohort 572

ESI 0.501 · percentile 90 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

88.644 days

Semi-major axis

0.3815 AU

Eccentricity

0.000

Inclination

89.34 °

Year Length

A year here lasts approximately 88.64 Earth days (24.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3815 AU.

Transit Fingerprint

Depth

0.063 %

Duration

7.820 h

Impact parameter b

0.883

Rp / R★

0.027840

Transit midpoint (BJD)

2,454,978.4719

Photometric dip

Transit produces a flux drop of 626 ppm lasting ≈ 7.82 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027840

Semi-major axis / stellar radius

44.000

Impact parameter (b)

0.883

Transit mid-time (BJD)

2,454,978.4719

Angular separation (arcsec)

0.67400

Eq. Temperature

391K

(118 °C)

Insolation (S⊕)

5.51

Earth = 1.00

Earth Similarity (ESI)

0.501

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-1771

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,661 K — cooler than the Sun (5,778 K)

Estimated Age

0.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.934 R☉

Stellar Mass

0.941 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.471 dex

Stellar density

0.596 g/cm³

Metallicity ratio

[Fe/H]

Distance

565.75 parsec

Light-years 1,845.23 ly

V-band magnitude

13.80 mag

Voyager-speed travel 32,540,701 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Total Proper Motion

8.873 mas/yr

PM Right Ascension

3.55 mas/yr

PM Declination

8.13 mas/yr

Galactic Cartesian (pc)

x = 0.246 · y = -0.608 · z = 0.755

Equatorial (J2000)

RA 292.01347° · Dec 49.01913°

Galactic ℓ, b

80.947° · 14.559°

Ecliptic λ, β

313.662° · 69.144°

HTM-20 index

735506102