Key parameters at a glance

A radius of 2.74 Earth radii
A mass of 6.74 Earth masses
Surface gravity around 0.90 g
An orbital period of 9.524 days
Semi-major axis 0.0792 AU
Equilibrium temperature 495 K (222 °C)
Distance from Earth 1,204.99 light-years
Earth Similarity Index 0.435
Travel time at Voyager 1 speed 21,249,938 years
Almost certainly tidally locked to its host star given the close orbit

5 siblings around Kepler-80

Kepler-80 c shares its host star with 5 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-80 f	Rocky Terrestrial	1.21	4,459.73	0.987	1,054	2016
Kepler-80 d	Super-Earth	1.53	6.75	3.072	722	2014
Kepler-80 e	Super-Earth	1.60	4.13	4.645	629	2014
Kepler-80 b	Sub-Neptune	2.67	6.93	7.052	547	2012
Kepler-80 c this	Sub-Neptune	2.74	6.74	9.524	495	2012
Kepler-80 g	Rocky Terrestrial	1.13	0.07	14.646	418	2017

Kepler-80 c Planet Profile

Physical Specs

Radius

2.74 R⊕

Radius (Jupiter)

0.244 R♃

Mass

6.74 M⊕

Mass (Jupiter)

0.021 M♃

Density

1.22 g/cm³

Surface Gravity

0.90 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.435

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#815of 1978

top 41.2%

This planet

2.74R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-212 c 2.74 R⊕ Kepler-192 b 2.74 R⊕ Kepler-1118 b 2.74 R⊕

Metric	Earth	Kepler-80 c	Jupiter
Radius (R⊕)	1.00	2.74	11.21
Mass (M⊕)	1.00	6.74	317.83
Density (g/cm³)	5.51	1.22	1.33
Surface Gravity (g)	1.00	0.90	2.53
Insolation (S⊕)	1.00	36.48	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	6.740 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 184296619

Gaia DR2

Gaia DR2 2076328963475704576

Gaia DR3

Gaia DR3 2076328963475704576

System

Kepler-80

Percentile among Sub-Neptune cohort

Radius 2.740 R⊕ · percentile 59 / cohort 1978

Mass 6.740 M⊕ · percentile 37 / cohort 1978

Orbital period 9.52 d · percentile 32 / cohort 1946

Distance 369.45 pc · percentile 39 / cohort 1975

ESI 0.435 · percentile 59 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

9.524 days

Semi-major axis

0.0792 AU

Eccentricity

0.008

Inclination

89.33 °

Year Length

A year here lasts approximately 9.52 Earth days (2.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0792 AU.

Transit Fingerprint

Depth

0.149 %

Duration

2.357 h

Impact parameter b

0.609

Rp / R★

0.036540

Transit midpoint (BJD)

2,455,696.0470

Photometric dip

Transit produces a flux drop of 1,491 ppm lasting ≈ 2.36 h.

Extended Orbital Architecture

Planet / star radius ratio

0.036540

Semi-major axis / stellar radius

25.230

Impact parameter (b)

0.609

Transit mid-time (BJD)

2,455,696.0470

Long. of periastron (ω)

190.00°

Angular separation (arcsec)

0.21400

Eq. Temperature

495K

(222 °C)

Insolation (S⊕)

36.48

Earth = 1.00

Earth Similarity (ESI)

0.435

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

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 2013

Instrument

Kepler CCD Array

Publication

2013-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2012 at Kepler (12 shown).

Kepler-54 c · Rocky Terrestrial Kepler-49 c · Sub-Neptune Kepler-55 b · Sub-Neptune Kepler-49 b · Sub-Neptune Kepler-81 c · Sub-Neptune Kepler-55 c · Sub-Neptune Kepler-52 c · Super-Earth Kepler-83 c · Sub-Neptune Kepler-32 d · Sub-Neptune Kepler-83 b · Sub-Neptune Kepler-54 b · Sub-Neptune Kepler-81 b · Sub-Neptune

Host System: Kepler-80

Spectral Class

K-type orange

Effective Temperature

4,540 K — cooler than the Sun (5,778 K)

Estimated Age

2.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.678 R☉

Stellar Mass

0.730 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.639 dex

Stellar density

2.330 g/cm³

Metallicity ratio

[Fe/H]

Distance

369.45 parsec

Light-years 1,204.99 ly

V-band magnitude

15.23 mag

Voyager-speed travel 21,249,938 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.678 mas

Total Proper Motion

7.316 mas/yr

PM Right Ascension

-1.38 mas/yr

PM Declination

-7.18 mas/yr

Galactic Cartesian (pc)

x = 0.337 · y = -0.688 · z = 0.643

Equatorial (J2000)

RA 296.11258° · Dec 39.97875°

Galactic ℓ, b

74.087° · 7.853°

Ecliptic λ, β

311.909° · 59.676°

HTM-20 index

-1092040752

Similar Worlds

TOI-1824 b

Sub-Neptune · K-type orange

Radius 2.74 R⊕ · 193.8 ly

K2-266 e

Sub-Neptune · K-type orange

Radius 2.73 R⊕ · 253.0 ly

Kepler-436 b

Sub-Neptune · K-type orange

Radius 2.73 R⊕ · 1,920.6 ly

Kepler-304 d

Sub-Neptune · K-type orange

Radius 2.75 R⊕ · 1,417.7 ly

TOI-1438 c

Sub-Neptune · K-type orange

Radius 2.75 R⊕ · 360.4 ly

Kepler-551 b

Sub-Neptune · K-type orange

Radius 2.73 R⊕ · 1,014.9 ly

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