Key parameters at a glance

A radius of 3.50 Earth radii
A mass of 12.10 Earth masses
Surface gravity around 0.99 g
An orbital period of 40.810 days
Semi-major axis 0.2483 AU
Equilibrium temperature 623 K (350 °C)
Distance from Earth 2,221.95 light-years
Earth Similarity Index 0.354
Travel time at Voyager 1 speed 39,184,158 years

Kepler-1773 b Planet Profile

Physical Specs

Radius

3.50 R⊕

Radius (Jupiter)

0.313 R♃

Mass

12.10 M⊕

Mass (Jupiter)

0.038 M♃

Density

1.54 g/cm³

Surface Gravity

0.99 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.354

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

#181of 1978

top 9.1%

This planet

3.50R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-396 b 3.50 R⊕ Kepler-177 b 3.50 R⊕ Kepler-92 b 3.51 R⊕

Metric	Earth	Kepler-1773 b	Jupiter
Radius (R⊕)	1.00	3.50	11.21
Mass (M⊕)	1.00	12.10	317.83
Density (g/cm³)	5.51	1.54	1.33
Surface Gravity (g)	1.00	0.99	2.53
Insolation (S⊕)	1.00	39.20	0.037

Star Catalogue Identifiers

TIC

TIC 120763491

Gaia DR2

Gaia DR2 2099957605786905344

Gaia DR3

Gaia DR3 2099957605786905344

System

Kepler-1773

Percentile among Sub-Neptune cohort

Radius 3.505 R⊕ · percentile 91 / cohort 1978

Mass 12.100 M⊕ · percentile 84 / cohort 1978

Orbital period 40.81 d · percentile 81 / cohort 1946

Distance 681.26 pc · percentile 58 / cohort 1975

ESI 0.354 · percentile 42 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

40.810 days

Semi-major axis

0.2483 AU

Eccentricity

0.000

Inclination

88.57 °

Year Length

A year here lasts approximately 40.81 Earth days (11.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2483 AU.

Transit Fingerprint

Depth

0.044 %

Duration

2.702 h

Impact parameter b

0.958

Rp / R★

0.019279

Transit midpoint (BJD)

2,454,975.6917

Photometric dip

Transit produces a flux drop of 436 ppm lasting ≈ 2.70 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019279

Semi-major axis / stellar radius

116.880

Impact parameter (b)

0.958

Transit mid-time (BJD)

2,454,975.6917

Angular separation (arcsec)

0.36400

Eq. Temperature

623K

(350 °C)

Insolation (S⊕)

39.20

Earth = 1.00

Earth Similarity (ESI)

0.354

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-1773

Spectral Class

F-type yellow-white

Effective Temperature

6,183 K — hotter than the Sun (5,778 K)

Estimated Age

2.91 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.300 R☉

Stellar Mass

1.241 M☉

Metallicity [Fe/H]

0.26

Extended Stellar Properties

Surface gravity (log g)

4.301 dex

Stellar density

0.630 g/cm³

Metallicity ratio

[Fe/H]

Distance

681.26 parsec

Light-years 2,221.95 ly

V-band magnitude

13.09 mag

Voyager-speed travel 39,184,158 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

1.439 mas

Total Proper Motion

2.478 mas/yr

PM Right Ascension

1.05 mas/yr

PM Declination

2.24 mas/yr

Galactic Cartesian (pc)

x = 0.219 · y = -0.754 · z = 0.619

Equatorial (J2000)

RA 286.22323° · Dec 38.25817°

Galactic ℓ, b

69.055° · 13.966°

Ecliptic λ, β

296.216° · 60.229°

HTM-20 index

777724603