Key parameters at a glance

A radius of 2.69 Earth radii
A mass of 7.68 Earth masses
Surface gravity around 1.06 g
An orbital period of 3.215 days
Semi-major axis 0.0439 AU
Equilibrium temperature 1,155 K (882 °C)
Distance from Earth 2,842.66 light-years
Earth Similarity Index 0.208
Travel time at Voyager 1 speed 50,130,276 years

Kepler-1772 b Planet Profile

Physical Specs

Radius

2.69 R⊕

Radius (Jupiter)

0.240 R♃

Mass

7.68 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.18 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.208

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

#895of 1978

top 45.2%

This planet

2.69R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-171 b 2.69 R⊕ HD 28109 b 2.69 R⊕ Kepler-417 c 2.69 R⊕

Metric	Earth	Kepler-1772 b	Jupiter
Radius (R⊕)	1.00	2.69	11.21
Mass (M⊕)	1.00	7.68	317.83
Density (g/cm³)	5.51	2.18	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	1,485.00	0.037

Star Catalogue Identifiers

TIC

TIC 122062591

Gaia DR2

Gaia DR2 2101002725951186560

Gaia DR3

Gaia DR3 2101002725951186560

System

Kepler-1772

Percentile among Sub-Neptune cohort

Radius 2.686 R⊕ · percentile 55 / cohort 1978

Mass 7.680 M⊕ · percentile 50 / cohort 1978

Orbital period 3.22 d · percentile 5 / cohort 1946

Distance 871.56 pc · percentile 71 / cohort 1975

ESI 0.208 · percentile 8 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.215 days

Semi-major axis

0.0439 AU

Eccentricity

0.000

Inclination

63.99 °

Year Length

A year here lasts approximately 3.22 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0439 AU.

Transit Fingerprint

Depth

0.016 %

Duration

3.903 h

Impact parameter b

0.849

Rp / R★

0.011486

Transit midpoint (BJD)

2,454,966.7774

Photometric dip

Transit produces a flux drop of 158 ppm lasting ≈ 3.90 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011486

Semi-major axis / stellar radius

6.382

Impact parameter (b)

0.849

Transit mid-time (BJD)

2,454,966.7774

Angular separation (arcsec)

0.05040

Eq. Temperature

1,155K

(882 °C)

Insolation (S⊕)

1,485.00

Earth = 1.00

Earth Similarity (ESI)

0.208

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1772

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,541 K — cooler than the Sun (5,778 K)

Estimated Age

7.94 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.934 R☉

Stellar Mass

0.942 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.472 dex

Stellar density

0.019 g/cm³

Metallicity ratio

[Fe/H]

Distance

871.56 parsec

Light-years 2,842.66 ly

V-band magnitude

13.55 mag

Voyager-speed travel 50,130,276 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.119 mas

Total Proper Motion

1.576 mas/yr

PM Right Ascension

1.18 mas/yr

PM Declination

1.04 mas/yr

Galactic Cartesian (pc)

x = 0.258 · y = -0.730 · z = 0.633

Equatorial (J2000)

RA 289.43812° · Dec 39.27036°

Galactic ℓ, b

71.067° · 12.104°

Ecliptic λ, β

301.643° · 60.592°

HTM-20 index

-170868509