Key parameters at a glance

A radius of 2.39 Earth radii
A mass of 23.60 Earth masses
Surface gravity around 4.13 g
An orbital period of 30.864 days
Semi-major axis 0.1850 AU
Equilibrium temperature 527 K (254 °C)
Distance from Earth 1,585.11 light-years
Earth Similarity Index 0.463
Travel time at Voyager 1 speed 27,953,385 years

3 siblings around Kepler-215

Kepler-215 d 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-215 b	Super-Earth	1.62	3.26	9.361	784	2014
Kepler-215 c	Super-Earth	1.77	3.78	14.667	675	2014
Kepler-215 d this	Sub-Neptune	2.39	23.60	30.864	527	2014
Kepler-215 e	Super-Earth	1.75	3.71	68.161	405	2014

Kepler-215 d Planet Profile

Physical Specs

Radius

2.39 R⊕

Radius (Jupiter)

0.213 R♃

Mass

23.60 M⊕

Mass (Jupiter)

0.074 M♃

Density

9.50 g/cm³

Surface Gravity

4.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.463

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

#1343of 1978

top 67.8%

This planet

2.39R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-193 b 2.39 R⊕ Kepler-152 c 2.39 R⊕ Kepler-238 c 2.39 R⊕

Metric	Earth	Kepler-215 d	Jupiter
Radius (R⊕)	1.00	2.39	11.21
Mass (M⊕)	1.00	23.60	317.83
Density (g/cm³)	5.51	9.50	1.33
Surface Gravity (g)	1.00	4.13	2.53
Insolation (S⊕)	1.00	21.40	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	23.600 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 271352188

Gaia DR2

Gaia DR2 2079885608708649344

Gaia DR3

Gaia DR3 2079885608708649344

System

Kepler-215

Percentile among Sub-Neptune cohort

Radius 2.390 R⊕ · percentile 31 / cohort 1978

Mass 23.600 M⊕ · percentile 96 / cohort 1978

Orbital period 30.86 d · percentile 74 / cohort 1946

Distance 486.00 pc · percentile 46 / cohort 1975

ESI 0.463 · percentile 65 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

30.864 days

Semi-major axis

0.1850 AU

Eccentricity

0.000

Inclination

88.93 °

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 0.1850 AU.

Transit Fingerprint

Depth

0.055 %

Duration

2.719 h

Impact parameter b

0.150

Rp / R★

0.024180

Transit midpoint (BJD)

2,455,005.9331

Photometric dip

Transit produces a flux drop of 551 ppm lasting ≈ 2.72 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024180

Semi-major axis / stellar radius

48.621

Impact parameter (b)

0.150

Transit mid-time (BJD)

2,455,005.9331

Angular separation (arcsec)

0.38100

Eq. Temperature

527K

(254 °C)

Insolation (S⊕)

21.40

Earth = 1.00

Earth Similarity (ESI)

0.463

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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-215

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,739 K — cooler than the Sun (5,778 K)

Estimated Age

1.62 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.027 R☉

Stellar Mass

0.788 M☉

Metallicity [Fe/H]

-0.44

Extended Stellar Properties

Surface gravity (log g)

4.364 dex

Stellar density

1.120 g/cm³

Metallicity ratio

[M/H]

Distance

486.00 parsec

Light-years 1,585.11 ly

V-band magnitude

13.68 mag

Voyager-speed travel 27,953,385 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.029 mas

Total Proper Motion

5.860 mas/yr

PM Right Ascension

4.87 mas/yr

PM Declination

3.26 mas/yr

Galactic Cartesian (pc)

x = 0.297 · y = -0.639 · z = 0.710

Equatorial (J2000)

RA 294.97353° · Dec 45.21369°

Galactic ℓ, b

78.357° · 11.073°

Ecliptic λ, β

314.409° · 64.849°

HTM-20 index

-1202227853