Key parameters at a glance

A radius of 6.41 Earth radii
A mass of 33.60 Earth masses
Surface gravity around 0.82 g
An orbital period of 53.449 days
Semi-major axis 0.2881 AU
Equilibrium temperature 486 K (213 °C)
Distance from Earth 7,633.94 light-years
Earth Similarity Index 0.338
Travel time at Voyager 1 speed 134,624,562 years

Kepler-891 b Planet Profile

Physical Specs

Radius

6.41 R⊕

Radius (Jupiter)

0.572 R♃

Mass

33.60 M⊕

Mass (Jupiter)

0.106 M♃

Density

0.70 g/cm³

Surface Gravity

0.82 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.338

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#247of 574

top 42.9%

This planet

6.41R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TOI-6038 A b 6.41 R⊕ MOA-2015-BLG-337L b 6.42 R⊕ KIC 5437945 b 6.40 R⊕

Metric	Earth	Kepler-891 b	Jupiter
Radius (R⊕)	1.00	6.41	11.21
Mass (M⊕)	1.00	33.60	317.83
Density (g/cm³)	5.51	0.70	1.33
Surface Gravity (g)	1.00	0.82	2.53
Insolation (S⊕)	1.00	44.33	0.037

Star Catalogue Identifiers

TIC

TIC 122713286

Gaia DR2

Gaia DR2 2101493898411455360

Gaia DR3

Gaia DR3 2101493898411455360

System

Kepler-891

Percentile among Neptune-like cohort

Radius 6.410 R⊕ · percentile 57 / cohort 574

Mass 33.600 M⊕ · percentile 55 / cohort 574

Orbital period 53.45 d · percentile 72 / cohort 524

Distance 2,340.58 pc · percentile 91 / cohort 572

ESI 0.338 · percentile 60 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

53.449 days

Semi-major axis

0.2881 AU

Eccentricity

0.000

Inclination

89.93 °

Year Length

A year here lasts approximately 53.45 Earth days (14.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2881 AU.

Transit Fingerprint

Depth

0.344 %

Duration

5.323 h

Impact parameter b

0.053

Rp / R★

0.055279

Transit midpoint (BJD)

2,454,982.2018

Photometric dip

Transit produces a flux drop of 3,437 ppm lasting ≈ 5.32 h.

Extended Orbital Architecture

Planet / star radius ratio

0.055279

Semi-major axis / stellar radius

80.697

Impact parameter (b)

0.053

Transit mid-time (BJD)

2,454,982.2018

Angular separation (arcsec)

0.12300

Eq. Temperature

486K

(213 °C)

Insolation (S⊕)

44.33

Earth = 1.00

Earth Similarity (ESI)

0.338

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

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-891

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

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

Estimated Age

3.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.070 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

3.500 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,340.58 parsec

Light-years 7,633.94 ly

V-band magnitude

15.39 mag

Voyager-speed travel 134,624,562 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.398 mas

Total Proper Motion

4.263 mas/yr

PM Right Ascension

-2.71 mas/yr

PM Declination

-3.29 mas/yr

Galactic Cartesian (pc)

x = 0.274 · y = -0.711 · z = 0.648

Equatorial (J2000)

RA 291.08376° · Dec 40.35523°

Galactic ℓ, b

72.625° · 11.434°

Ecliptic λ, β

304.771° · 61.273°

HTM-20 index

1400857717