Key parameters at a glance

A radius of 7.22 Earth radii
A mass of 41.20 Earth masses
Surface gravity around 0.79 g
An orbital period of 219.322 days
Semi-major axis 0.7336 AU
Equilibrium temperature 313 K (40 °C)
Distance from Earth 4,450.50 light-years
Earth Similarity Index 0.455
Travel time at Voyager 1 speed 78,484,501 years

1 sibling around Kepler-1085

Kepler-1085 b shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-1085 c	Sub-Neptune	3.27	10.70	56.777	491	2020
Kepler-1085 b this	Neptune-like	7.22	41.20	219.322	313	2016

Kepler-1085 b Planet Profile

Physical Specs

Radius

7.22 R⊕

Radius (Jupiter)

0.644 R♃

Mass

41.20 M⊕

Mass (Jupiter)

0.130 M♃

Density

0.60 g/cm³

Surface Gravity

0.79 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.455

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

#190of 574

top 32.9%

This planet

7.22R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

TIC 139270665 b 7.23 R⊕ TOI-2134 c 7.27 R⊕ TOI-257 b 7.16 R⊕

Metric	Earth	Kepler-1085 b	Jupiter
Radius (R⊕)	1.00	7.22	11.21
Mass (M⊕)	1.00	41.20	317.83
Density (g/cm³)	5.51	0.60	1.33
Surface Gravity (g)	1.00	0.79	2.53
Insolation (S⊕)	1.00	2.06	0.037

Star Catalogue Identifiers

TIC

TIC 158487108

Gaia DR2

Gaia DR2 2130321925058256384

Gaia DR3

Gaia DR3 2130321925058256384

System

Kepler-1085

Percentile among Neptune-like cohort

Radius 7.220 R⊕ · percentile 67 / cohort 574

Mass 41.200 M⊕ · percentile 64 / cohort 574

Orbital period 219.32 d · percentile 90 / cohort 524

Distance 1,364.53 pc · percentile 82 / cohort 572

ESI 0.455 · percentile 82 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

219.322 days

Semi-major axis

0.7336 AU

Eccentricity

0.000

Inclination

89.90 °

Year Length

A year here lasts approximately 219.32 Earth days (60.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.7336 AU.

Transit Fingerprint

Depth

0.363 %

Duration

12.358 h

Impact parameter b

0.244

Rp / R★

0.058145

Transit midpoint (BJD)

2,455,153.7286

Photometric dip

Transit produces a flux drop of 3,629 ppm lasting ≈ 12.36 h.

Extended Orbital Architecture

Planet / star radius ratio

0.058145

Semi-major axis / stellar radius

138.600

Impact parameter (b)

0.244

Transit mid-time (BJD)

2,455,153.7286

Angular separation (arcsec)

0.53800

Eq. Temperature

313K

(40 °C)

Insolation (S⊕)

2.06

Earth = 1.00

Earth Similarity (ESI)

0.455

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-1085

Spectral Class

F-type yellow-white

Effective Temperature

6,000 K — hotter than the Sun (5,778 K)

Estimated Age

3.39 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.140 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.370 dex

Stellar density

1.010 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,364.53 parsec

Light-years 4,450.50 ly

V-band magnitude

15.27 mag

Voyager-speed travel 78,484,501 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.704 mas

Total Proper Motion

0.159 mas/yr

PM Right Ascension

0.16 mas/yr

PM Declination

0.03 mas/yr

Galactic Cartesian (pc)

x = 0.208 · y = -0.661 · z = 0.721

Equatorial (J2000)

RA 287.47764° · Dec 46.14117°

Galactic ℓ, b

76.942° · 16.209°

Ecliptic λ, β

303.069° · 67.584°

HTM-20 index

-1735555335