Key parameters at a glance

A radius of 0.31 Earth radii
A mass of 0.79 Earth masses
Surface gravity around 8.23 g
An orbital period of 13.367 days
Semi-major axis 0.1019 AU
Equilibrium temperature 718 K (445 °C)
Distance from Earth 208.48 light-years
Earth Similarity Index 0.198
Travel time at Voyager 1 speed 3,676,566 years

3 siblings around Kepler-37

Kepler-37 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-37 b this	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	Rocky Terrestrial	0.37	8.10	51.196	401	2014

Kepler-37 b Planet Profile

Physical Specs

Radius

0.31 R⊕

Radius (Jupiter)

0.028 R♃

Mass

0.79 M⊕

Mass (Jupiter)

0.002 M♃

Density

140.00 g/cm³

Surface Gravity

8.23 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.198

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#570of 570

top 99.8%

This planet

0.31R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

PSR B1257+12 b 0.34 R⊕ Kepler-37 e 0.37 R⊕ Kepler-879 c 0.40 R⊕

Metric	Earth	Kepler-37 b	Jupiter
Radius (R⊕)	1.00	0.31	11.21
Mass (M⊕)	1.00	0.79	317.83
Density (g/cm³)	5.51	140.00	1.33
Surface Gravity (g)	1.00	8.23	2.53
Insolation (S⊕)	1.00	44.50	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	0.790 M⊕	Direct mass measurement (not derived).

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 0.310 R⊕ · percentile 0 / cohort 570

Mass 0.790 M⊕ · percentile 29 / cohort 570

Orbital period 13.37 d · percentile 85 / cohort 567

Distance 63.92 pc · percentile 19 / cohort 566

ESI 0.198 · percentile 14 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

13.367 days

Semi-major axis

0.1019 AU

Eccentricity

0.098

Inclination

88.63 °

Year Length

A year here lasts approximately 13.37 Earth days (3.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1019 AU.

Transit Fingerprint

Depth

0.001 %

Duration

3.733 h

Impact parameter b

0.759

Rp / R★

0.003600

Transit midpoint (BJD)

2,455,017.0473

Photometric dip

Transit produces a flux drop of 12 ppm lasting ≈ 3.73 h.

Extended Orbital Architecture

Planet / star radius ratio

0.003600

Semi-major axis / stellar radius

28.680

Impact parameter (b)

0.759

RV semi-amplitude (K)

0.250 m/s

Transit mid-time (BJD)

2,455,017.0473

Angular separation (arcsec)

1.59000

Eq. Temperature

718K

(445 °C)

Insolation (S⊕)

44.50

Earth = 1.00

Earth Similarity (ESI)

0.198

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.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Barclay et al. 2013

Instrument

Kepler CCD Array

Publication

2013-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 c · Super-Earth

Host System: Kepler-37

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,357 K — cooler than the Sun (5,778 K)

Estimated Age

7.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.789 R☉

Stellar Mass

0.790 M☉

Metallicity [Fe/H]

-0.36

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