Key parameters at a glance

A radius of 1.21 Earth radii
A mass of 1.92 Earth masses
Surface gravity around 1.31 g
An orbital period of 7.123 days
Semi-major axis 0.0670 AU
Equilibrium temperature 879 K (606 °C)
Distance from Earth 596.81 light-years
Earth Similarity Index 0.357
Travel time at Voyager 1 speed 10,524,744 years

K2-279 b Planet Profile

Physical Specs

Radius

1.21 R⊕

Radius (Jupiter)

0.108 R♃

Mass

1.92 M⊕

Mass (Jupiter)

0.006 M♃

Density

5.96 g/cm³

Surface Gravity

1.31 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.357

HZ Position Unknown

Controversial No

Discovery

Year 2018

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#56of 570

top 9.6%

This planet

1.21R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-415 b 1.21 R⊕ Kepler-169 c 1.21 R⊕ Kepler-189 b 1.21 R⊕

Metric	Earth	K2-279 b	Jupiter
Radius (R⊕)	1.00	1.21	11.21
Mass (M⊕)	1.00	1.92	317.83
Density (g/cm³)	5.51	5.96	1.33
Surface Gravity (g)	1.00	1.31	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 709015

Gaia DR2

Gaia DR2 3632489004572413952

Gaia DR3

Gaia DR3 3632489004572617088

System

K2-279

Percentile among Rocky Terrestrial cohort

Radius 1.210 R⊕ · percentile 87 / cohort 570

Mass 1.920 M⊕ · percentile 80 / cohort 570

Orbital period 7.12 d · percentile 69 / cohort 567

Distance 182.98 pc · percentile 30 / cohort 566

ESI 0.357 · percentile 52 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

7.123 days

Semi-major axis

0.0670 AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 7.12 Earth days (2.0% of a terrestrial year) at a mean orbital distance of 0.0670 AU.

Transit Fingerprint

Depth

0.021 %

Duration

3.072 h

Impact parameter b

0.540

Rp / R★

0.012900

Transit midpoint (BJD)

2,457,222.1328

Photometric dip

Transit produces a flux drop of 207 ppm lasting ≈ 3.07 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012900

Semi-major axis / stellar radius

14.450

Impact parameter (b)

0.540

Transit mid-time (BJD)

2,457,222.1328

Angular separation (arcsec)

0.36600

Eq. Temperature

879K

(606 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.357

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Livingston et al. 2018

Instrument

Kepler CCD Array

Publication

2018-12

Observation locale

Space

Discovery cohort

Planets confirmed in 2018 at K2 (12 shown).

K2-190 c · Rocky Terrestrial K2-183 b · Rocky Terrestrial K2-209 b · Rocky Terrestrial K2-210 b · Rocky Terrestrial K2-165 b · Super-Earth K2-169 b · Super-Earth K2-148 b · Super-Earth K2-219 b · Super-Earth K2-190 b · Super-Earth K2-200 b · Super-Earth K2-201 b · Super-Earth K2-170 b · Super-Earth

Host System: K2-279

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,558 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.860 R☉

Stellar Mass

0.790 M☉

Metallicity [Fe/H]

-0.37

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

1.130 g/cm³

Systemic radial velocity

3.29 km/s

Metallicity ratio

[Fe/H]

Distance

182.98 parsec

Light-years 596.81 ly

V-band magnitude

11.49 mag

Voyager-speed travel 10,524,744 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

5.437 mas

Total Proper Motion

102.295 mas/yr

PM Right Ascension

-87.03 mas/yr

PM Declination

-53.76 mas/yr

Galactic Cartesian (pc)

x = -0.903 · y = -0.417 · z = -0.105

Equatorial (J2000)

RA 204.77929° · Dec -6.04176°

Galactic ℓ, b

323.851° · 54.882°

Ecliptic λ, β

205.165° · 3.969°

HTM-20 index

-2011632036