Key parameters at a glance

A radius of 1.21 Earth radii
A mass of 4,459.73 Earth masses
Surface gravity around 3,046.06 g
An orbital period of 0.987 days
Semi-major axis 0.0175 AU
Equilibrium temperature 1,054 K (781 °C)
Distance from Earth 1,204.99 light-years
Earth Similarity Index 0.055
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 f 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 this	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	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 f Planet Profile

Physical Specs

Radius

1.21 R⊕

Radius (Jupiter)

0.108 R♃

Mass

4,459.73 M⊕

Mass (Jupiter)

14.032 M♃

Density

703.00 g/cm³

Surface Gravity

3,046.06 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.055

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

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	Kepler-80 f	Jupiter
Radius (R⊕)	1.00	1.21	11.21
Mass (M⊕)	1.00	4,459.73	317.83
Density (g/cm³)	5.51	703.00	1.33
Surface Gravity (g)	1.00	3,046.06	2.53
Insolation (S⊕)	1.00	750.96	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	4,459.730 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 Rocky Terrestrial cohort

Radius 1.210 R⊕ · percentile 87 / cohort 570

Mass 4,459.730 M⊕ · percentile 100 / cohort 570

Orbital period 0.99 d · percentile 11 / cohort 567

Distance 369.45 pc · percentile 49 / cohort 566

ESI 0.055 · percentile 0 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.987 days

Semi-major axis

0.0175 AU

Eccentricity

0.186

Inclination

86.50 °

Year Length

A year here lasts roughly 23.7 hours long on a mildly elliptical path at a mean orbital distance of 0.0175 AU.

Transit Fingerprint

Depth

0.045 %

Duration

1.188 h

Impact parameter b

0.056

Rp / R★

0.015340

Transit midpoint (BJD)

2,454,966.1704

Photometric dip

Transit produces a flux drop of 450 ppm lasting ≈ 1.19 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015340

Semi-major axis / stellar radius

5.570

Impact parameter (b)

0.056

Transit mid-time (BJD)

2,454,966.1704

Angular separation (arcsec)

0.04740

Eq. Temperature

1,054K

(781 °C)

Insolation (S⊕)

750.96

Earth = 1.00

Earth Similarity (ESI)

0.055

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 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