Key parameters at a glance

A radius of 2.44 Earth radii
A mass of 8.38 Earth masses
Surface gravity around 1.40 g
An orbital period of 10.910 days
Semi-major axis 0.0782 AU
Equilibrium temperature 443 K (170 °C)
Distance from Earth 1,015.07 light-years
Earth Similarity Index 0.572
Travel time at Voyager 1 speed 17,900,745 years
Almost certainly tidally locked to its host star given the close orbit

3 siblings around Kepler-49

Kepler-49 c 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-49 d	Super-Earth	1.60	235.98	2.577	717	2014
Kepler-49 b	Sub-Neptune	2.58	9.77	7.200	509	2012
Kepler-49 c this	Sub-Neptune	2.44	8.38	10.910	443	2012
Kepler-49 e	Super-Earth	1.56	1.04	18.596	371	2014

Kepler-49 c Planet Profile

Physical Specs

Radius

2.44 R⊕

Radius (Jupiter)

0.218 R♃

Mass

8.38 M⊕

Mass (Jupiter)

0.026 M♃

Density

3.11 g/cm³

Surface Gravity

1.40 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.572

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

#1268of 1978

top 64.1%

This planet

2.44R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-338 b 2.44 R⊕ Kepler-1086 b 2.44 R⊕ HD 106315 b 2.44 R⊕

Metric	Earth	Kepler-49 c	Jupiter
Radius (R⊕)	1.00	2.44	11.21
Mass (M⊕)	1.00	8.38	317.83
Density (g/cm³)	5.51	3.11	1.33
Surface Gravity (g)	1.00	1.40	2.53
Insolation (S⊕)	1.00	12.34	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.380 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 137555411

Gaia DR2

Gaia DR2 2053523271244105216

Gaia DR3

Gaia DR3 2053523271244105216

System

Kepler-49

Percentile among Sub-Neptune cohort

Radius 2.444 R⊕ · percentile 36 / cohort 1978

Mass 8.380 M⊕ · percentile 58 / cohort 1978

Orbital period 10.91 d · percentile 38 / cohort 1946

Distance 311.22 pc · percentile 35 / cohort 1975

ESI 0.572 · percentile 79 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

10.910 days

Semi-major axis

0.0782 AU

Eccentricity

0.008

Inclination

88.68 °

Year Length

A year here lasts approximately 10.91 Earth days (3.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0782 AU.

Transit Fingerprint

Depth

0.139 %

Duration

2.180 h

Impact parameter b

0.946

Rp / R★

0.034000

Transit midpoint (BJD)

2,455,002.8525

Photometric dip

Transit produces a flux drop of 1,387 ppm lasting ≈ 2.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034000

Semi-major axis / stellar radius

13.420

Impact parameter (b)

0.946

Transit mid-time (BJD)

2,455,002.8525

Angular separation (arcsec)

0.25100

Eq. Temperature

443K

(170 °C)

Insolation (S⊕)

12.34

Earth = 1.00

Earth Similarity (ESI)

0.572

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

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-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 Kepler-81 b · Sub-Neptune

Host System: Kepler-49

Spectral Class

M-type red dwarf

Effective Temperature

4,096 K — cooler than the Sun (5,778 K)

Estimated Age

2.88 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.618 R☉

Stellar Mass

0.607 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.680 dex

Stellar density

3.567 g/cm³

Metallicity ratio

[Fe/H]

Distance

311.22 parsec

Light-years 1,015.07 ly

V-band magnitude

15.66 mag

Voyager-speed travel 17,900,745 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.185 mas

Total Proper Motion

8.734 mas/yr

PM Right Ascension

-7.61 mas/yr

PM Declination

4.28 mas/yr

Galactic Cartesian (pc)

x = 0.288 · y = -0.703 · z = 0.651

Equatorial (J2000)

RA 292.29452° · Dec 40.59181°

Galactic ℓ, b

73.257° · 10.714°

Ecliptic λ, β

306.745° · 61.217°

HTM-20 index

1873653475