Key parameters at a glance

A radius of 2.60 Earth radii
A mass of 7.27 Earth masses
Surface gravity around 1.08 g
An orbital period of 27.434 days
Semi-major axis 0.1810 AU
Equilibrium temperature 672 K (399 °C)
Distance from Earth 3,339.51 light-years
Earth Similarity Index 0.371
Travel time at Voyager 1 speed 58,892,278 years

4 siblings around Kepler-84

Kepler-84 e shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-84 d	Super-Earth	1.38	2.48	4.225	1,254	2014
Kepler-84 b	Sub-Neptune	2.23	40.00	8.726	985	2012
Kepler-84 c	Sub-Neptune	2.36	20.20	12.883	865	2012
Kepler-84 e this	Sub-Neptune	2.60	7.27	27.434	672	2014
Kepler-84 f	Sub-Neptune	2.20	5.48	44.552	572	2014

Kepler-84 e Planet Profile

Physical Specs

Radius

2.60 R⊕

Radius (Jupiter)

0.232 R♃

Mass

7.27 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.27 g/cm³

Surface Gravity

1.08 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.371

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1017of 1978

top 51.4%

This planet

2.60R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-174 b 2.60 R⊕ K2-155 c 2.60 R⊕ Kepler-115 c 2.60 R⊕

Metric	Earth	Kepler-84 e	Jupiter
Radius (R⊕)	1.00	2.60	11.21
Mass (M⊕)	1.00	7.27	317.83
Density (g/cm³)	5.51	2.27	1.33
Surface Gravity (g)	1.00	1.08	2.53
Insolation (S⊕)	1.00	48.29	0.037

Star Catalogue Identifiers

TIC

TIC 170646917

Gaia DR2

Gaia DR2 2073776859551124992

Gaia DR3

Gaia DR3 2073776859551124992

System

Kepler-84

Percentile among Sub-Neptune cohort

Radius 2.600 R⊕ · percentile 48 / cohort 1978

Mass 7.270 M⊕ · percentile 44 / cohort 1978

Orbital period 27.43 d · percentile 71 / cohort 1946

Distance 1,023.90 pc · percentile 79 / cohort 1975

ESI 0.371 · percentile 46 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

27.434 days

Semi-major axis

0.1810 AU

Eccentricity

0.000

Inclination

88.99 °

Year Length

A year here lasts approximately 27.43 Earth days (7.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1810 AU.

Transit Fingerprint

Depth

0.047 %

Duration

5.121 h

Impact parameter b

0.090

Rp / R★

0.020601

Transit midpoint (BJD)

2,454,978.1254

Photometric dip

Transit produces a flux drop of 473 ppm lasting ≈ 5.12 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020601

Semi-major axis / stellar radius

41.830

Impact parameter (b)

0.090

Transit mid-time (BJD)

2,454,978.1254

Angular separation (arcsec)

0.17700

Eq. Temperature

672K

(399 °C)

Insolation (S⊕)

48.29

Earth = 1.00

Earth Similarity (ESI)

0.371

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-84

Spectral Class

F-type yellow-white

Effective Temperature

6,031 K — hotter than the Sun (5,778 K)

Estimated Age

3.98 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.169 R☉

Stellar Mass

1.060 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.323 dex

Stellar density

0.029 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,023.90 parsec

Light-years 3,339.51 ly

V-band magnitude

14.92 mag

Voyager-speed travel 58,892,278 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.693 mas

Total Proper Motion

4.035 mas/yr

PM Right Ascension

-1.08 mas/yr

PM Declination

-3.89 mas/yr

Galactic Cartesian (pc)

x = 0.360 · y = -0.670 · z = 0.649

Equatorial (J2000)

RA 298.25202° · Dec 40.49608°

Galactic ℓ, b

75.354° · 6.689°

Ecliptic λ, β

315.291° · 59.572°

HTM-20 index

-620986613