Key parameters at a glance

A radius of 2.61 Earth radii
A mass of 7.33 Earth masses
Surface gravity around 1.07 g
An orbital period of 35.012 days
Semi-major axis 0.2093 AU
Equilibrium temperature 603 K (330 °C)
Distance from Earth 2,251.57 light-years
Earth Similarity Index 0.411
Travel time at Voyager 1 speed 39,706,475 years

Kepler-1776 b Planet Profile

Physical Specs

Radius

2.61 R⊕

Radius (Jupiter)

0.233 R♃

Mass

7.33 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.26 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.411

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

#997of 1978

top 50.4%

This planet

2.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-54 b 2.61 R⊕ TOI-1451 b 2.61 R⊕ GJ 143 b 2.61 R⊕

Metric	Earth	Kepler-1776 b	Jupiter
Radius (R⊕)	1.00	2.61	11.21
Mass (M⊕)	1.00	7.33	317.83
Density (g/cm³)	5.51	2.26	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	29.90	0.037

Star Catalogue Identifiers

TIC

TIC 159728250

Gaia DR2

Gaia DR2 2129103700534539136

Gaia DR3

Gaia DR3 2129103700534539136

System

Kepler-1776

Percentile among Sub-Neptune cohort

Radius 2.612 R⊕ · percentile 50 / cohort 1978

Mass 7.330 M⊕ · percentile 46 / cohort 1978

Orbital period 35.01 d · percentile 77 / cohort 1946

Distance 690.34 pc · percentile 59 / cohort 1975

ESI 0.411 · percentile 55 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

35.012 days

Semi-major axis

0.2093 AU

Eccentricity

0.000

Inclination

88.69 °

Year Length

A year here lasts approximately 35.01 Earth days (9.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2093 AU.

Transit Fingerprint

Depth

0.044 %

Duration

2.868 h

Impact parameter b

0.387

Rp / R★

0.019872

Transit midpoint (BJD)

2,454,983.3701

Photometric dip

Transit produces a flux drop of 437 ppm lasting ≈ 2.87 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019872

Semi-major axis / stellar radius

40.500

Impact parameter (b)

0.387

Transit mid-time (BJD)

2,454,983.3701

Angular separation (arcsec)

0.30300

Eq. Temperature

603K

(330 °C)

Insolation (S⊕)

29.90

Earth = 1.00

Earth Similarity (ESI)

0.411

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-1776

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,872 K — hotter than the Sun (5,778 K)

Estimated Age

0.60 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.153 R☉

Stellar Mass

1.041 M☉

Metallicity [Fe/H]

0.10

Extended Stellar Properties

Surface gravity (log g)

4.332 dex

Stellar density

1.022 g/cm³

Metallicity ratio

[Fe/H]

Distance

690.34 parsec

Light-years 2,251.57 ly

V-band magnitude

13.68 mag

Voyager-speed travel 39,706,475 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.420 mas

Total Proper Motion

6.268 mas/yr

PM Right Ascension

1.49 mas/yr

PM Declination

-6.09 mas/yr

Galactic Cartesian (pc)

x = 0.250 · y = -0.634 · z = 0.732

Equatorial (J2000)

RA 291.53440° · Dec 47.04250°

Galactic ℓ, b

78.957° · 14.019°

Ecliptic λ, β

310.730° · 67.460°

HTM-20 index

-57064929