Key parameters at a glance

A radius of 4.30 Earth radii
A mass of 49.40 Earth masses
Surface gravity around 2.67 g
An orbital period of 35.736 days
Semi-major axis 0.2236 AU
Equilibrium temperature 774 K (501 °C)
Distance from Earth 3,383.54 light-years
Earth Similarity Index 0.176
Travel time at Voyager 1 speed 59,668,766 years

3 siblings around Kepler-279

Kepler-279 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-279 b	Sub-Neptune	3.62	4,180.93	12.310	1,104	2014
Kepler-279 c this	Neptune-like	4.30	49.40	35.736	774	2013
Kepler-279 d	Sub-Neptune	3.10	37.50	54.414	574	2013
Kepler-279 e	Neptune-like	4.13	56.00	98.353	552	2025

Kepler-279 c Planet Profile

Physical Specs

Radius

4.30 R⊕

Radius (Jupiter)

0.384 R♃

Mass

49.40 M⊕

Mass (Jupiter)

0.155 M♃

Density

0.30 g/cm³

Surface Gravity

2.67 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.176

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

#494of 574

top 85.9%

This planet

4.30R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-38 b 4.30 R⊕ KOI-984 b 4.30 R⊕ Kepler-359 c 4.30 R⊕

Metric	Earth	Kepler-279 c	Jupiter
Radius (R⊕)	1.00	4.30	11.21
Mass (M⊕)	1.00	49.40	317.83
Density (g/cm³)	5.51	0.30	1.33
Surface Gravity (g)	1.00	2.67	2.53
Insolation (S⊕)	1.00	60.16	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	49.400 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 158428960

Gaia DR2

Gaia DR2 2102456726998624640

Gaia DR3

Gaia DR3 2102456726998624640

System

Kepler-279

Percentile among Neptune-like cohort

Radius 4.300 R⊕ · percentile 13 / cohort 574

Mass 49.400 M⊕ · percentile 70 / cohort 574

Orbital period 35.74 d · percentile 64 / cohort 524

Distance 1,037.40 pc · percentile 76 / cohort 572

ESI 0.176 · percentile 22 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

35.736 days

Semi-major axis

0.2236 AU

Eccentricity

0.000

Inclination

87.09 °

Year Length

A year here lasts approximately 35.74 Earth days (9.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2236 AU.

Transit Fingerprint

Depth

0.079 %

Duration

8.995 h

Impact parameter b

0.917

Rp / R★

0.030850

Transit midpoint (BJD)

2,454,984.0612

Photometric dip

Transit produces a flux drop of 792 ppm lasting ≈ 9.00 h.

Extended Orbital Architecture

Planet / star radius ratio

0.030850

Semi-major axis / stellar radius

18.880

Impact parameter (b)

0.917

Transit mid-time (BJD)

2,454,984.0612

Angular separation (arcsec)

0.21600

Eq. Temperature

774K

(501 °C)

Insolation (S⊕)

60.16

Earth = 1.00

Earth Similarity (ESI)

0.176

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

Xie 2014

Instrument

Kepler CCD Array

Publication

2014-02

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-279

Spectral Class

F-type yellow-white

Effective Temperature

6,689 K — hotter than the Sun (5,778 K)

Estimated Age

0.22 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.070 R☉

Stellar Mass

1.100 M☉

Metallicity [Fe/H]

-0.11

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

0.044 g/cm³

Metallicity ratio

[M/H]

Distance

1,037.40 parsec

Light-years 3,383.54 ly

V-band magnitude

13.65 mag

Voyager-speed travel 59,668,766 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.935 mas

Total Proper Motion

3.988 mas/yr

PM Right Ascension

3.99 mas/yr

PM Declination

0.14 mas/yr

Galactic Cartesian (pc)

x = 0.221 · y = -0.707 · z = 0.672

Equatorial (J2000)

RA 287.39130° · Dec 42.19482°

Galactic ℓ, b

73.147° · 14.724°

Ecliptic λ, β

300.130° · 63.826°

HTM-20 index

-2058739019