Key parameters at a glance

A radius of 1.52 Earth radii
A mass of 2.93 Earth masses
Surface gravity around 1.27 g
An orbital period of 4.022 days
Semi-major axis 0.0473 AU
Equilibrium temperature 1,017 K (744 °C)
Distance from Earth 1,944.67 light-years
Earth Similarity Index 0.292
Travel time at Voyager 1 speed 34,294,298 years

Kepler-1891 b Planet Profile

Physical Specs

Radius

1.52 R⊕

Radius (Jupiter)

0.136 R♃

Mass

2.93 M⊕

Mass (Jupiter)

0.009 M♃

Density

4.57 g/cm³

Surface Gravity

1.27 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.292

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

#705of 1176

top 59.9%

This planet

1.52R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-128 c 1.52 R⊕ Kepler-65 d 1.52 R⊕ Kepler-306 b 1.52 R⊕

Metric	Earth	Kepler-1891 b	Jupiter
Radius (R⊕)	1.00	1.52	11.21
Mass (M⊕)	1.00	2.93	317.83
Density (g/cm³)	5.51	4.57	1.33
Surface Gravity (g)	1.00	1.27	2.53
Insolation (S⊕)	1.00	253.28	0.037

Star Catalogue Identifiers

TIC

TIC 159221689

Gaia DR2

Gaia DR2 2126892067256468736

Gaia DR3

Gaia DR3 2126892067256468736

System

Kepler-1891

Percentile among Super-Earth cohort

Radius 1.521 R⊕ · percentile 40 / cohort 1176

Mass 2.930 M⊕ · percentile 37 / cohort 1176

Orbital period 4.02 d · percentile 31 / cohort 1164

Distance 596.24 pc · percentile 54 / cohort 1171

ESI 0.292 · percentile 35 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.022 days

Semi-major axis

0.0473 AU

Eccentricity

0.000

Inclination

88.30 °

Year Length

A year here lasts approximately 4.02 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0473 AU.

Transit Fingerprint

Depth

0.023 %

Duration

0.861 h

Impact parameter b

0.587

Rp / R★

0.014713

Transit midpoint (BJD)

2,454,968.1732

Photometric dip

Transit produces a flux drop of 234 ppm lasting ≈ 0.86 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014713

Semi-major axis / stellar radius

12.200

Impact parameter (b)

0.587

Transit mid-time (BJD)

2,454,968.1732

Angular separation (arcsec)

0.07930

Eq. Temperature

1,017K

(744 °C)

Insolation (S⊕)

253.28

Earth = 1.00

Earth Similarity (ESI)

0.292

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-1891

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,516 K — cooler than the Sun (5,778 K)

Estimated Age

3.70 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.827 R☉

Stellar Mass

0.873 M☉

Metallicity [Fe/H]

-0.14

Extended Stellar Properties

Surface gravity (log g)

4.544 dex

Stellar density

18.270 g/cm³

Metallicity ratio

[Fe/H]

Distance

596.24 parsec

Light-years 1,944.67 ly

V-band magnitude

14.41 mag

Voyager-speed travel 34,294,298 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.648 mas

Total Proper Motion

9.014 mas/yr

PM Right Ascension

-3.92 mas/yr

PM Declination

-8.12 mas/yr

Galactic Cartesian (pc)

x = 0.245 · y = -0.672 · z = 0.699

Equatorial (J2000)

RA 290.04385° · Dec 44.37054°

Galactic ℓ, b

76.008° · 13.845°

Ecliptic λ, β

305.936° · 65.328°

HTM-20 index

618083921