Key parameters at a glance

A radius of 2.89 Earth radii
A mass of 8.70 Earth masses
Surface gravity around 1.04 g
An orbital period of 30.864 days
Semi-major axis 0.1985 AU
Equilibrium temperature 743 K (470 °C)
Distance from Earth 2,082.47 light-years
Earth Similarity Index 0.322
Travel time at Voyager 1 speed 36,724,417 years

Kepler-805 b Planet Profile

Physical Specs

Radius

2.89 R⊕

Radius (Jupiter)

0.258 R♃

Mass

8.70 M⊕

Mass (Jupiter)

0.027 M♃

Density

1.98 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.322

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

#640of 1978

top 32.3%

This planet

2.89R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-781 b 2.89 R⊕ Kepler-689 b 2.89 R⊕ Kepler-53 b 2.89 R⊕

Metric	Earth	Kepler-805 b	Jupiter
Radius (R⊕)	1.00	2.89	11.21
Mass (M⊕)	1.00	8.70	317.83
Density (g/cm³)	5.51	1.98	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	86.47	0.037

Star Catalogue Identifiers

TIC

TIC 275573748

Gaia DR2

Gaia DR2 2126508676995012352

Gaia DR3

Gaia DR3 2126508676995012352

System

Kepler-805

Percentile among Sub-Neptune cohort

Radius 2.890 R⊕ · percentile 67 / cohort 1978

Mass 8.700 M⊕ · percentile 61 / cohort 1978

Orbital period 30.86 d · percentile 74 / cohort 1946

Distance 638.49 pc · percentile 56 / cohort 1975

ESI 0.322 · percentile 33 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

30.864 days

Semi-major axis

0.1985 AU

Eccentricity

0.000

Inclination

85.76 °

Year Length

A year here lasts approximately 30.86 Earth days (8.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1985 AU.

Transit Fingerprint

Depth

0.026 %

Duration

8.421 h

Impact parameter b

0.031

Rp / R★

0.015804

Transit midpoint (BJD)

2,454,995.8830

Photometric dip

Transit produces a flux drop of 257 ppm lasting ≈ 8.42 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015804

Semi-major axis / stellar radius

28.600

Impact parameter (b)

0.031

Transit mid-time (BJD)

2,454,995.8830

Angular separation (arcsec)

0.31100

Eq. Temperature

743K

(470 °C)

Insolation (S⊕)

86.47

Earth = 1.00

Earth Similarity (ESI)

0.322

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-805

Spectral Class

F-type yellow-white

Effective Temperature

6,112 K — hotter than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.650 R☉

Stellar Mass

1.190 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.080 dex

Stellar density

0.260 g/cm³

Systemic radial velocity

-9.07 km/s

Metallicity ratio

[Fe/H]

Distance

638.49 parsec

Light-years 2,082.47 ly

V-band magnitude

12.59 mag

Voyager-speed travel 36,724,417 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.538 mas

Total Proper Motion

14.063 mas/yr

PM Right Ascension

11.17 mas/yr

PM Declination

8.55 mas/yr

Galactic Cartesian (pc)

x = 0.279 · y = -0.649 · z = 0.708

Equatorial (J2000)

RA 293.23002° · Dec 45.05336°

Galactic ℓ, b

77.641° · 12.096°

Ecliptic λ, β

311.575° · 65.174°

HTM-20 index

-1832305784