Key parameters at a glance

A radius of 3.12 Earth radii
A mass of 9.91 Earth masses
Surface gravity around 1.02 g
An orbital period of 7.721 days
Semi-major axis 0.0761 AU
Equilibrium temperature 1,021 K (748 °C)
Distance from Earth 1,964.17 light-years
Earth Similarity Index 0.224
Travel time at Voyager 1 speed 34,638,138 years

Kepler-1791 b Planet Profile

Physical Specs

Radius

3.12 R⊕

Radius (Jupiter)

0.278 R♃

Mass

9.91 M⊕

Mass (Jupiter)

0.031 M♃

Density

1.79 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.224

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

#417of 1978

top 21.0%

This planet

3.12R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-11 d 3.12 R⊕ Kepler-150 e 3.12 R⊕ Kepler-224 c 3.12 R⊕

Metric	Earth	Kepler-1791 b	Jupiter
Radius (R⊕)	1.00	3.12	11.21
Mass (M⊕)	1.00	9.91	317.83
Density (g/cm³)	5.51	1.79	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	257.14	0.037

Star Catalogue Identifiers

TIC

TIC 164728985

Gaia DR2

Gaia DR2 2104257967562692096

Gaia DR3

Gaia DR3 2104257967562692096

System

Kepler-1791

Percentile among Sub-Neptune cohort

Radius 3.121 R⊕ · percentile 79 / cohort 1978

Mass 9.910 M⊕ · percentile 72 / cohort 1978

Orbital period 7.72 d · percentile 25 / cohort 1946

Distance 602.22 pc · percentile 53 / cohort 1975

ESI 0.224 · percentile 10 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.721 days

Semi-major axis

0.0761 AU

Eccentricity

0.000

Inclination

84.91 °

Year Length

A year here lasts approximately 7.72 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0761 AU.

Transit Fingerprint

Depth

0.027 %

Duration

1.515 h

Impact parameter b

0.502

Rp / R★

0.015396

Transit midpoint (BJD)

2,454,969.5637

Photometric dip

Transit produces a flux drop of 265 ppm lasting ≈ 1.52 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015396

Semi-major axis / stellar radius

10.860

Impact parameter (b)

0.502

Transit mid-time (BJD)

2,454,969.5637

Angular separation (arcsec)

0.12600

Eq. Temperature

1,021K

(748 °C)

Insolation (S⊕)

257.14

Earth = 1.00

Earth Similarity (ESI)

0.224

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-1791

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,887 K — hotter than the Sun (5,778 K)

Estimated Age

3.73 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.177 R☉

Stellar Mass

0.985 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.290 dex

Stellar density

0.406 g/cm³

Metallicity ratio

[Fe/H]

Distance

602.22 parsec

Light-years 1,964.17 ly

V-band magnitude

13.53 mag

Voyager-speed travel 34,638,138 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Total Proper Motion

5.922 mas/yr

PM Right Ascension

-1.98 mas/yr

PM Declination

-5.58 mas/yr

Galactic Cartesian (pc)

x = 0.184 · y = -0.712 · z = 0.677

Equatorial (J2000)

RA 284.49032° · Dec 42.64826°

Galactic ℓ, b

72.729° · 16.876°

Ecliptic λ, β

295.611° · 64.804°

HTM-20 index

1489630843