Key parameters at a glance

A radius of 3.65 Earth radii
A mass of 12.90 Earth masses
Surface gravity around 0.97 g
An orbital period of 85.654 days
Semi-major axis 0.3957 AU
Equilibrium temperature 522 K (249 °C)
Distance from Earth 2,142.92 light-years
Earth Similarity Index 0.410
Travel time at Voyager 1 speed 37,790,391 years

Kepler-1775 b Planet Profile

Physical Specs

Radius

3.65 R⊕

Radius (Jupiter)

0.325 R♃

Mass

12.90 M⊕

Mass (Jupiter)

0.041 M♃

Density

1.46 g/cm³

Surface Gravity

0.97 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.410

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

#118of 1978

top 5.9%

This planet

3.65R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-1231 b 3.65 R⊕ Kepler-967 c 3.65 R⊕ Kepler-1128 b 3.65 R⊕

Metric	Earth	Kepler-1775 b	Jupiter
Radius (R⊕)	1.00	3.65	11.21
Mass (M⊕)	1.00	12.90	317.83
Density (g/cm³)	5.51	1.46	1.33
Surface Gravity (g)	1.00	0.97	2.53
Insolation (S⊕)	1.00	9.90	0.037

Star Catalogue Identifiers

TIC

TIC 120892579

Gaia DR2

Gaia DR2 2100001036496903040

Gaia DR3

Gaia DR3 2100001036496903040

System

Kepler-1775

Percentile among Sub-Neptune cohort

Radius 3.648 R⊕ · percentile 94 / cohort 1978

Mass 12.900 M⊕ · percentile 87 / cohort 1978

Orbital period 85.65 d · percentile 92 / cohort 1946

Distance 657.02 pc · percentile 57 / cohort 1975

ESI 0.410 · percentile 54 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

85.654 days

Semi-major axis

0.3957 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 85.65 Earth days (23.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3957 AU.

Transit Fingerprint

Depth

0.049 %

Duration

6.877 h

Impact parameter b

0.049

Rp / R★

0.020242

Transit midpoint (BJD)

2,454,988.1274

Photometric dip

Transit produces a flux drop of 489 ppm lasting ≈ 6.88 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020242

Semi-major axis / stellar radius

97.180

Impact parameter (b)

0.049

Transit mid-time (BJD)

2,454,988.1274

Angular separation (arcsec)

0.60200

Eq. Temperature

522K

(249 °C)

Insolation (S⊕)

9.90

Earth = 1.00

Earth Similarity (ESI)

0.410

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-1775

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,818 K — hotter than the Sun (5,778 K)

Estimated Age

2.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.647 R☉

Stellar Mass

1.149 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.065 dex

Stellar density

2.367 g/cm³

Metallicity ratio

[Fe/H]

Distance

657.02 parsec

Light-years 2,142.92 ly

V-band magnitude

13.43 mag

Voyager-speed travel 37,790,391 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.493 mas

Total Proper Motion

7.438 mas/yr

PM Right Ascension

4.36 mas/yr

PM Declination

6.02 mas/yr

Galactic Cartesian (pc)

x = 0.220 · y = -0.748 · z = 0.626

Equatorial (J2000)

RA 286.40235° · Dec 38.73857°

Galactic ℓ, b

69.566° · 14.031°

Ecliptic λ, β

296.714° · 60.665°

HTM-20 index

582439583