Key parameters at a glance

A radius of 2.71 Earth radii
A mass of 7.90 Earth masses
Surface gravity around 1.07 g
An orbital period of 13.341 days
Semi-major axis 0.1078 AU
Equilibrium temperature 838 K (565 °C)
Distance from Earth 797.74 light-years
Earth Similarity Index 0.297
Travel time at Voyager 1 speed 14,068,232 years

1 sibling around EPIC 220674823

EPIC 220674823 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
EPIC 220674823 b	Super-Earth	1.61	7.54	0.571	2,324	2016
EPIC 220674823 c this	Sub-Neptune	2.71	7.90	13.341	838	2016

EPIC 220674823 c Planet Profile

Physical Specs

Radius

2.71 R⊕

Radius (Jupiter)

0.242 R♃

Mass

7.90 M⊕

Mass (Jupiter)

0.025 M♃

Density

2.34 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.297

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#848of 1978

top 42.8%

This planet

2.71R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-182 b 2.71 R⊕ K2-250 b 2.71 R⊕ Kepler-1748 b 2.71 R⊕

Metric	Earth	EPIC 220674823 c	Jupiter
Radius (R⊕)	1.00	2.71	11.21
Mass (M⊕)	1.00	7.90	317.83
Density (g/cm³)	5.51	2.34	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	70.00	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	7.900 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 266015990

Gaia DR2

Gaia DR2 2582617711154563968

Gaia DR3

Gaia DR3 2582617711154563968

System

EPIC 220674823

Percentile among Sub-Neptune cohort

Radius 2.712 R⊕ · percentile 57 / cohort 1978

Mass 7.900 M⊕ · percentile 53 / cohort 1978

Orbital period 13.34 d · percentile 46 / cohort 1946

Distance 244.59 pc · percentile 31 / cohort 1975

ESI 0.297 · percentile 27 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

13.341 days

Semi-major axis

0.1078 AU

Eccentricity

0.180

Inclination

89.34 °

Year Length

A year here lasts approximately 13.34 Earth days (3.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.1078 AU.

Transit Fingerprint

Depth

0.090 %

Duration

3.782 h

Impact parameter b

0.260

Rp / R★

0.025000

Transit midpoint (BJD)

2,459,473.5249

Photometric dip

Transit produces a flux drop of 903 ppm lasting ≈ 3.78 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025000

Semi-major axis / stellar radius

23.350

Impact parameter (b)

0.260

RV semi-amplitude (K)

2.270 m/s

Transit mid-time (BJD)

2,459,473.5249

Long. of periastron (ω)

178.00°

Angular separation (arcsec)

0.44100

Eq. Temperature

838K

(565 °C)

Insolation (S⊕)

70.00

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.

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

Adams et al. 2017

Instrument

Kepler CCD Array

Publication

2017-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at K2 (12 shown).

K2-72 d · Rocky Terrestrial K2-72 b · Rocky Terrestrial K2-91 b · Rocky Terrestrial K2-72 c · Rocky Terrestrial K2-102 b · Super-Earth K2-90 c · Super-Earth K2-72 e · Super-Earth K2-83 b · Rocky Terrestrial K2-88 b · Rocky Terrestrial K2-80 c · Super-Earth K2-83 c · Super-Earth K2-65 b · Super-Earth

Host System: EPIC 220674823

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,578 K — cooler than the Sun (5,778 K)

Estimated Age

7.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.990 R☉

Stellar Mass

0.913 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.408 dex

Stellar density

1.350 g/cm³

Systemic radial velocity

-14.79 km/s

Rotational v·sin i

2.62 km/s

Activity index (log R'HK)

-5.135

Metallicity ratio

[Fe/H]

Distance

244.59 parsec

Light-years 797.74 ly

V-band magnitude

12.10 mag

Voyager-speed travel 14,068,232 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

4.060 mas

Total Proper Motion

61.004 mas/yr

PM Right Ascension

60.96 mas/yr

PM Declination

2.24 mas/yr

Galactic Cartesian (pc)

x = 0.957 · y = 0.222 · z = 0.187

Equatorial (J2000)

RA 13.08002° · Dec 10.79471°

Galactic ℓ, b

123.284° · -52.076°

Ecliptic λ, β

16.223° · 4.784°

HTM-20 index

85471358