Key parameters at a glance

A radius of 0.37 Earth radii
A mass of 8.10 Earth masses
Surface gravity around 59.17 g
An orbital period of 51.196 days
Semi-major axis 0.2500 AU
Equilibrium temperature 401 K (128 °C)
Distance from Earth 208.48 light-years
Earth Similarity Index 0.184
Travel time at Voyager 1 speed 3,676,566 years

3 siblings around Kepler-37

Kepler-37 e 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-37 b	Rocky Terrestrial	0.31	0.79	13.367	718	2013
Kepler-37 c	Rocky Terrestrial	0.76	1.30	21.302	615	2013
Kepler-37 d	Sub-Neptune	2.03	2.00	39.792	499	2013
Kepler-37 e this	Rocky Terrestrial	0.37	8.10	51.196	401	2014

Kepler-37 e Planet Profile

Physical Specs

Radius

0.37 R⊕

Radius (Jupiter)

0.033 R♃

Mass

8.10 M⊕

Mass (Jupiter)

0.025 M♃

Density

879.00 g/cm³

Surface Gravity

59.17 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.184

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Transit Timing Variations

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#568of 570

top 99.5%

This planet

0.37R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-879 c 0.40 R⊕ PSR B1257+12 b 0.34 R⊕ Kepler-444 b 0.40 R⊕

Metric	Earth	Kepler-37 e	Jupiter
Radius (R⊕)	1.00	0.37	11.21
Mass (M⊕)	1.00	8.10	317.83
Density (g/cm³)	5.51	879.00	1.33
Surface Gravity (g)	1.00	59.17	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	8.100 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 164652245

Gaia DR2

Gaia DR2 2106674071344722688

Gaia DR3

Gaia DR3 2106674071344722688

System

Kepler-37

Percentile among Rocky Terrestrial cohort

Radius 0.370 R⊕ · percentile 0 / cohort 570

Mass 8.100 M⊕ · percentile 97 / cohort 570

Orbital period 51.20 d · percentile 99 / cohort 567

Distance 63.92 pc · percentile 19 / cohort 566

ESI 0.184 · percentile 11 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

51.196 days

Semi-major axis

0.2500 AU

Eccentricity

0.000

Inclination

89.95 °

Year Length

A year here lasts approximately 51.20 Earth days (14.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2500 AU.

Transit Fingerprint

Depth

0.003 %

Duration

8.990 h

Impact parameter b

0.020

Rp / R★

0.004600

Transit midpoint (BJD)

2,455,028.7300

Photometric dip

Transit produces a flux drop of 27 ppm lasting ≈ 8.99 h.

Extended Orbital Architecture

Planet / star radius ratio

0.004600

Semi-major axis / stellar radius

43.400

Impact parameter (b)

0.020

RV semi-amplitude (K)

1.600 m/s

Transit mid-time (BJD)

2,455,028.7300

Angular separation (arcsec)

3.91000

Eq. Temperature

401K

(128 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.184

0 = alien, 1 = Earth-identical

Insufficient insolation data — 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

Hadden et al. 2014

Instrument

Kepler CCD Array

Publication

2014-05

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-37

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,288 K — cooler than the Sun (5,778 K)

Estimated Age

3.80 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.772 R☉

Stellar Mass

0.800 M☉

Metallicity [Fe/H]

-0.25

Extended Stellar Properties

Surface gravity (log g)

4.567 dex

Stellar density

2.460 g/cm³

Systemic radial velocity

-30.10 km/s

Rotational v·sin i

1.10 km/s

Metallicity ratio

[Fe/H]

Distance

63.92 parsec

Light-years 208.48 ly

V-band magnitude

9.77 mag

Voyager-speed travel 3,676,566 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

15.616 mas

Total Proper Motion

77.677 mas/yr

PM Right Ascension

-60.52 mas/yr

PM Declination

48.69 mas/yr

Galactic Cartesian (pc)

x = 0.173 · y = -0.692 · z = 0.701

Equatorial (J2000)

RA 284.05925° · Dec 44.51837°

Galactic ℓ, b

74.437° · 17.844°

Ecliptic λ, β

295.961° · 66.695°

HTM-20 index

842412176