Key parameters at a glance

A radius of 2.87 Earth radii
A mass of 8.58 Earth masses
Surface gravity around 1.04 g
An orbital period of 9.179 days
Semi-major axis 0.0819 AU
Equilibrium temperature 753 K (480 °C)
Distance from Earth 2,518.85 light-years
Earth Similarity Index 0.319
Travel time at Voyager 1 speed 44,419,870 years

Kepler-1722 b Planet Profile

Physical Specs

Radius

2.87 R⊕

Radius (Jupiter)

0.256 R♃

Mass

8.58 M⊕

Mass (Jupiter)

0.027 M♃

Density

2.00 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.319

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

#669of 1978

top 33.8%

This planet

2.87R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-561 c 2.87 R⊕ Kepler-11 c 2.87 R⊕ Kepler-297 b 2.87 R⊕

Metric	Earth	Kepler-1722 b	Jupiter
Radius (R⊕)	1.00	2.87	11.21
Mass (M⊕)	1.00	8.58	317.83
Density (g/cm³)	5.51	2.00	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	76.14	0.037

Star Catalogue Identifiers

TIC

TIC 360023124

Gaia DR2

Gaia DR2 2076834154709585664

Gaia DR3

Gaia DR3 2076834154709585664

System

Kepler-1722

Percentile among Sub-Neptune cohort

Radius 2.867 R⊕ · percentile 66 / cohort 1978

Mass 8.580 M⊕ · percentile 61 / cohort 1978

Orbital period 9.18 d · percentile 31 / cohort 1946

Distance 772.28 pc · percentile 64 / cohort 1975

ESI 0.319 · percentile 32 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.179 days

Semi-major axis

0.0819 AU

Eccentricity

0.000

Inclination

88.77 °

Year Length

A year here lasts approximately 9.18 Earth days (2.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0819 AU.

Transit Fingerprint

Depth

0.080 %

Duration

2.142 h

Impact parameter b

0.319

Rp / R★

0.026824

Transit midpoint (BJD)

2,455,006.0881

Photometric dip

Transit produces a flux drop of 797 ppm lasting ≈ 2.14 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026824

Semi-major axis / stellar radius

31.960

Impact parameter (b)

0.319

Transit mid-time (BJD)

2,455,006.0881

Angular separation (arcsec)

0.10600

Eq. Temperature

753K

(480 °C)

Insolation (S⊕)

76.14

Earth = 1.00

Earth Similarity (ESI)

0.319

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-1722

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,506 K — cooler than the Sun (5,778 K)

Estimated Age

1.40 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.788 R☉

Stellar Mass

0.876 M☉

Metallicity [Fe/H]

-0.20

Extended Stellar Properties

Surface gravity (log g)

4.584 dex

Stellar density

4.440 g/cm³

Metallicity ratio

[Fe/H]

Distance

772.28 parsec

Light-years 2,518.85 ly

V-band magnitude

15.00 mag

Voyager-speed travel 44,419,870 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.267 mas

Total Proper Motion

12.301 mas/yr

PM Right Ascension

-4.45 mas/yr

PM Declination

-11.47 mas/yr

Galactic Cartesian (pc)

x = 0.337 · y = -0.672 · z = 0.659

Equatorial (J2000)

RA 296.66274° · Dec 41.26120°

Galactic ℓ, b

75.423° · 8.111°

Ecliptic λ, β

313.613° · 60.726°

HTM-20 index

-972533152