Key parameters at a glance

A radius of 2.57 Earth radii
A mass of 146.78 Earth masses
Surface gravity around 22.22 g
An orbital period of 7.490 days
Semi-major axis 0.0710 AU
Equilibrium temperature 753 K (480 °C)
Distance from Earth 2,809.92 light-years
Earth Similarity Index 0.134
Travel time at Voyager 1 speed 49,552,972 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around Kepler-245

Kepler-245 b shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-245 e	Super-Earth	1.75	1,806.36	3.220	998	2016
Kepler-245 b this	Sub-Neptune	2.57	146.78	7.490	753	2014
Kepler-245 c	Sub-Neptune	2.18	26.70	17.461	568	2014
Kepler-245 d	Sub-Neptune	3.03	21.60	36.277	445	2014

Kepler-245 b Planet Profile

Physical Specs

Radius

2.57 R⊕

Radius (Jupiter)

0.229 R♃

Mass

146.78 M⊕

Mass (Jupiter)

0.462 M♃

Density

0.12 g/cm³

Surface Gravity

22.22 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.134

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1074of 1978

top 54.2%

This planet

2.57R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1549 b 2.57 R⊕ Kepler-549 b 2.57 R⊕ Kepler-313 c 2.57 R⊕

Metric	Earth	Kepler-245 b	Jupiter
Radius (R⊕)	1.00	2.57	11.21
Mass (M⊕)	1.00	146.78	317.83
Density (g/cm³)	5.51	0.12	1.33
Surface Gravity (g)	1.00	22.22	2.53
Insolation (S⊕)	1.00	77.75	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	146.780 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 63004906

Gaia DR2

Gaia DR2 2101768089124657664

Gaia DR3

Gaia DR3 2101768089124657664

System

Kepler-245

Percentile among Sub-Neptune cohort

Radius 2.570 R⊕ · percentile 45 / cohort 1978

Mass 146.780 M⊕ · percentile 99 / cohort 1978

Orbital period 7.49 d · percentile 24 / cohort 1946

Distance 861.53 pc · percentile 70 / cohort 1975

ESI 0.134 · percentile 1 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

7.490 days

Semi-major axis

0.0710 AU

Eccentricity

0.000

Inclination

89.95 °

Year Length

A year here lasts approximately 7.49 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0710 AU.

Transit Fingerprint

Depth

0.121 %

Duration

2.804 h

Impact parameter b

0.200

Rp / R★

0.031177

Transit midpoint (BJD)

2,455,007.9492

Photometric dip

Transit produces a flux drop of 1,212 ppm lasting ≈ 2.80 h.

Extended Orbital Architecture

Planet / star radius ratio

0.031177

Semi-major axis / stellar radius

21.600

Impact parameter (b)

0.200

Transit mid-time (BJD)

2,455,007.9492

Angular separation (arcsec)

0.08240

Eq. Temperature

753K

(480 °C)

Insolation (S⊕)

77.75

Earth = 1.00

Earth Similarity (ESI)

0.134

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-245

Spectral Class

K-type orange

Effective Temperature

5,100 K — cooler than the Sun (5,778 K)

Estimated Age

3.63 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.795 R☉

Stellar Mass

0.856 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

1.700 g/cm³

Metallicity ratio

[Fe/H]

Distance

861.53 parsec

Light-years 2,809.92 ly

V-band magnitude

15.55 mag

Voyager-speed travel 49,552,972 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.133 mas

Total Proper Motion

6.121 mas/yr

PM Right Ascension

3.71 mas/yr

PM Declination

4.87 mas/yr

Galactic Cartesian (pc)

x = 0.272 · y = -0.686 · z = 0.675

Equatorial (J2000)

RA 291.63900° · Dec 42.43635°

Galactic ℓ, b

74.722° · 11.972°

Ecliptic λ, β

307.008° · 63.122°

HTM-20 index

-339621301

Similar Worlds

Kepler-532 b

Sub-Neptune · K-type orange

Radius 2.57 R⊕ · 1,020.2 ly

Kepler-241 c

Sub-Neptune · K-type orange

Radius 2.57 R⊕ · 1,669.9 ly

Kepler-660 b

Sub-Neptune · K-type orange

Radius 2.57 R⊕ · 1,854.0 ly

Kepler-580 b

Sub-Neptune · K-type orange

Radius 2.57 R⊕ · 1,056.4 ly

TOI-1174 b

Sub-Neptune · K-type orange

Radius 2.56 R⊕ · 308.7 ly

KOI-1833 d

Sub-Neptune · K-type orange

Radius 2.58 R⊕ · 946.9 ly

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