Key parameters at a glance

A radius of 2.01 Earth radii
A mass of 4.70 Earth masses
Surface gravity around 1.16 g
An orbital period of 19.092 days
Semi-major axis 0.1350 AU
Distance from Earth 654.93 light-years
Earth Similarity Index 0.784
Travel time at Voyager 1 speed 11,549,651 years

2 siblings around K2-80

K2-80 b 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
K2-80 c	Super-Earth	1.47	2.76	5.605	—	2016
K2-80 b this	Sub-Neptune	2.01	4.70	19.092	—	2016
K2-80 d	Sub-Neptune	2.55	7.04	28.867	—	2018

K2-80 b Planet Profile

Physical Specs

Radius

2.01 R⊕

Radius (Jupiter)

0.179 R♃

Mass

4.70 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.18 g/cm³

Surface Gravity

1.16 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.784

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

#1940of 1978

top 98.0%

This planet

2.01R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-415 c 2.01 R⊕ Kepler-260 b 2.01 R⊕ Kepler-280 c 2.01 R⊕

Metric	Earth	K2-80 b	Jupiter
Radius (R⊕)	1.00	2.01	11.21
Mass (M⊕)	1.00	4.70	317.83
Density (g/cm³)	5.51	3.18	1.33
Surface Gravity (g)	1.00	1.16	2.53
Insolation (S⊕)	1.00	32.50	0.037

Star Catalogue Identifiers

TIC

TIC 242961495

Gaia DR2

Gaia DR2 38723395078288256

Gaia DR3

Gaia DR3 38723395078288256

System

K2-80

Percentile among Sub-Neptune cohort

Radius 2.010 R⊕ · percentile 1 / cohort 1978

Mass 4.700 M⊕ · percentile 3 / cohort 1978

Orbital period 19.09 d · percentile 60 / cohort 1946

Distance 200.80 pc · percentile 29 / cohort 1975

ESI 0.784 · percentile 99 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.092 days

Semi-major axis

0.1350 AU

Eccentricity

—

Inclination

88.99 °

Year Length

A year here lasts approximately 19.09 Earth days (5.2% of a terrestrial year) at a mean orbital distance of 0.1350 AU.

Transit Fingerprint

Depth

0.056 %

Duration

4.460 h

Rp / R★

0.021000

Transit midpoint (BJD)

2,457,077.6100

Photometric dip

Transit produces a flux drop of 562 ppm lasting ≈ 4.46 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021000

Semi-major axis / stellar radius

29.258

Transit mid-time (BJD)

2,457,077.6100

Angular separation (arcsec)

0.67200

Eq. Temperature

—

Insolation (S⊕)

32.50

Earth = 1.00

Earth Similarity (ESI)

0.784

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Crossfield et al. 2016

Instrument

Kepler CCD Array

Publication

2016-09

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: K2-80

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,441 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.870 R☉

Stellar Mass

0.900 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.519 dex

Stellar density

1.907 g/cm³

Systemic radial velocity

16.78 km/s

Metallicity ratio

[Fe/H]

Distance

200.80 parsec

Light-years 654.93 ly

V-band magnitude

12.69 mag

Voyager-speed travel 11,549,651 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

4.952 mas

Total Proper Motion

60.422 mas/yr

PM Right Ascension

-2.93 mas/yr

PM Declination

-60.35 mas/yr

Galactic Cartesian (pc)

x = 0.500 · y = 0.834 · z = 0.234

Equatorial (J2000)

RA 59.03749° · Dec 13.55903°

Galactic ℓ, b

176.612° · -29.483°

Ecliptic λ, β

59.760° · -6.689°

HTM-20 index

2019361615