Key parameters at a glance

A radius of 1.88 Earth radii
A mass of 3.94 Earth masses
Surface gravity around 1.11 g
An orbital period of 4.778 days
Semi-major axis 0.0539 AU
Equilibrium temperature 932 K (659 °C)
Distance from Earth 1,000.44 light-years
Earth Similarity Index 0.297
Travel time at Voyager 1 speed 17,642,836 years
Almost certainly tidally locked to its host star given the close orbit

4 siblings around Kepler-48

Kepler-48 b shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-48 b this	Super-Earth	1.88	3.94	4.778	932	2012
Kepler-48 c	Sub-Neptune	2.71	14.61	9.674	736	2012
Kepler-48 d	Sub-Neptune	2.04	7.93	42.896	448	2014
Kepler-48 e	Gas Giant	13.40	657.00	982.000	—	2014
Kepler-48 f	Gas Giant	13.80	298.58	5,219.682	—	2023

Kepler-48 b Planet Profile

Physical Specs

Radius

1.88 R⊕

Radius (Jupiter)

0.168 R♃

Mass

3.94 M⊕

Mass (Jupiter)

0.012 M♃

Density

3.23 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.297

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#153of 1176

top 12.9%

This planet

1.88R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-137 c 1.88 R⊕ Kepler-291 c 1.88 R⊕ Kepler-1644 b 1.88 R⊕

Metric	Earth	Kepler-48 b	Jupiter
Radius (R⊕)	1.00	1.88	11.21
Mass (M⊕)	1.00	3.94	317.83
Density (g/cm³)	5.51	3.23	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	173.12	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	3.940 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	6.609 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 171882123

Gaia DR2

Gaia DR2 2075112109039378688

Gaia DR3

Gaia DR3 2075112109039378688

System

Kepler-48

Percentile among Super-Earth cohort

Radius 1.880 R⊕ · percentile 86 / cohort 1176

Mass 3.940 M⊕ · percentile 72 / cohort 1176

Orbital period 4.78 d · percentile 39 / cohort 1164

Distance 306.74 pc · percentile 32 / cohort 1171

ESI 0.297 · percentile 36 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.778 days

Semi-major axis

0.0539 AU

Eccentricity

0.000

Inclination

89.91 °

Year Length

A year here lasts approximately 4.78 Earth days (1.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0539 AU.

Transit Fingerprint

Depth

0.047 %

Duration

2.736 h

Impact parameter b

0.170

Rp / R★

0.019318

Transit midpoint (BJD)

2,454,957.0611

Photometric dip

Transit produces a flux drop of 473 ppm lasting ≈ 2.74 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019318

Semi-major axis / stellar radius

13.609

Impact parameter (b)

0.170

RV semi-amplitude (K)

1.620 m/s

Transit mid-time (BJD)

2,454,957.0611

Angular separation (arcsec)

0.17600

Eq. Temperature

932K

(659 °C)

Insolation (S⊕)

173.12

Earth = 1.00

Earth Similarity (ESI)

0.297

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.

Radial velocity

Stellar wobble has been measured spectroscopically.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Steffen et al. 2013

Instrument

Kepler CCD Array

Publication

2013-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2012 at Kepler (12 shown).

Kepler-54 c · Rocky Terrestrial Kepler-49 c · Sub-Neptune Kepler-55 b · Sub-Neptune Kepler-49 b · Sub-Neptune Kepler-81 c · Sub-Neptune Kepler-55 c · Sub-Neptune Kepler-52 c · Super-Earth Kepler-83 c · Sub-Neptune Kepler-32 d · Sub-Neptune Kepler-83 b · Sub-Neptune Kepler-54 b · Sub-Neptune Kepler-80 c · Sub-Neptune

Host System: Kepler-48

Spectral Class

K-type orange

Effective Temperature

5,194 K — cooler than the Sun (5,778 K)

Estimated Age

3.14 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.890 R☉

Stellar Mass

0.880 M☉

Metallicity [Fe/H]

0.17

Extended Stellar Properties

Surface gravity (log g)

4.487 dex

Stellar density

1.980 g/cm³

Systemic radial velocity

-10.53 km/s

Rotational v·sin i

0.50 km/s

Metallicity ratio

[Fe/H]

Distance

306.74 parsec

Light-years 1,000.44 ly

V-band magnitude

13.17 mag

Voyager-speed travel 17,642,836 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.231 mas

Total Proper Motion

24.275 mas/yr

PM Right Ascension

13.23 mas/yr

PM Declination

-20.36 mas/yr

Galactic Cartesian (pc)

x = 0.368 · y = -0.660 · z = 0.655

Equatorial (J2000)

RA 299.13931° · Dec 40.94894°

Galactic ℓ, b

76.090° · 6.339°

Ecliptic λ, β

316.862° · 59.737°

HTM-20 index

-213247919

Similar Worlds

Kepler-1221 b

Super-Earth · K-type orange

Radius 1.88 R⊕ · 2,979.9 ly

TOI-286 c

Super-Earth · K-type orange

Radius 1.88 R⊕ · 193.2 ly

Kepler-137 c

Super-Earth · K-type orange

Radius 1.88 R⊕ · 988.2 ly

TOI-2322 c

Super-Earth · K-type orange

Radius 1.87 R⊕ · 195.2 ly

K2-47 b

Super-Earth · K-type orange

Radius 1.89 R⊕ · 1,141.2 ly

Kepler-1032 b

Super-Earth · K-type orange

Radius 1.87 R⊕ · 2,195.1 ly

Explore Related Categories

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