Key parameters at a glance

A radius of 1.03 Earth radii
A mass of 1.08 Earth masses
Surface gravity around 1.02 g
An orbital period of 2.716 days
Distance from Earth 1,092.51 light-years
Earth Similarity Index 0.992
Travel time at Voyager 1 speed 19,266,500 years
Almost certainly tidally locked to its host star given the close orbit

2 siblings around K2-16

EPIC 201754305 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
EPIC 201754305 d this	Rocky Terrestrial	1.03	1.08	2.716	—	2019
K2-16 b	Sub-Neptune	2.02	4.74	7.619	658	2015
K2-16 c	Sub-Neptune	2.54	6.99	19.079	485	2015

EPIC 201754305 d Planet Profile

Physical Specs

Radius

1.03 R⊕

Radius (Jupiter)

0.092 R♃

Mass

1.08 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.43 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.992

HZ Position Unknown

Controversial No

Discovery

Year 2019

Method Transit

Facility K2

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#297of 570

top 51.9%

This planet

1.03R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-395 b 1.03 R⊕ Kepler-387 b 1.03 R⊕ Kepler-1398 c 1.03 R⊕

Metric	Earth	EPIC 201754305 d	Jupiter
Radius (R⊕)	1.00	1.03	11.21
Mass (M⊕)	1.00	1.08	317.83
Density (g/cm³)	5.51	5.43	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	—	0.037

Star Catalogue Identifiers

TIC

TIC 281886199

Gaia DR2

Gaia DR2 3897048338487064064

Gaia DR3

Gaia DR3 3897048338487064064

System

K2-16

Percentile among Rocky Terrestrial cohort

Radius 1.030 R⊕ · percentile 46 / cohort 570

Mass 1.080 M⊕ · percentile 41 / cohort 570

Orbital period 2.72 d · percentile 31 / cohort 567

Distance 334.97 pc · percentile 45 / cohort 566

ESI 0.992 · percentile 99 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.716 days

Semi-major axis

— AU

Eccentricity

—

Inclination

— °

Year Length

A year here lasts approximately 2.72 Earth days (0.7% of a terrestrial year).

Transit Fingerprint

Impact parameter b

0.210

Rp / R★

0.015000

Transit midpoint (BJD)

2,456,850.4963

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.992

0 = alien, 1 = Earth-identical

Insufficient insolation data. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Heller et al. 2019

Instrument

Kepler CCD Array

Publication

2019-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2019 at K2 (12 shown).

EPIC 206032309 b · Rocky Terrestrial EPIC 201833600 c · Rocky Terrestrial EPIC 206215704 b · Rocky Terrestrial EPIC 201841433 b · Rocky Terrestrial EPIC 206317286 b · Rocky Terrestrial EPIC 201615463 c · Rocky Terrestrial EPIC 212499991 b · Super-Earth EPIC 220554210 c · Super-Earth EPIC 201497682 b · Rocky Terrestrial K2-133 e · Super-Earth EPIC 206024342 b · Super-Earth EPIC 206042996 b · Super-Earth

Host System: K2-16

Spectral Class

K-type orange

Effective Temperature

4,761 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.544 R☉

Stellar Mass

0.670 M☉

Metallicity [Fe/H]

-0.33

Extended Stellar Properties

Surface gravity (log g)

4.629 dex

Stellar density

2.960 g/cm³

Rotational v·sin i

2.00 km/s

Metallicity ratio

[Fe/H]

Distance

334.97 parsec

Light-years 1,092.51 ly

V-band magnitude

14.67 mag

Voyager-speed travel 19,266,500 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

2.957 mas

Total Proper Motion

22.566 mas/yr

PM Right Ascension

-6.38 mas/yr

PM Declination

21.65 mas/yr

Galactic Cartesian (pc)

x = -0.993 · y = 0.085 · z = 0.079

Equatorial (J2000)

RA 175.09722° · Dec 4.55743°

Galactic ℓ, b

262.912° · 61.777°

Ecliptic λ, β

173.689° · 2.236°

HTM-20 index

1035328883