Key parameters at a glance

A radius of 2.61 Earth radii
A mass of 7.32 Earth masses
Surface gravity around 1.07 g
An orbital period of 3.762 days
Semi-major axis 0.0470 AU
Equilibrium temperature 1,121 K (848 °C)
Distance from Earth 4,007.90 light-years
Earth Similarity Index 0.217
Travel time at Voyager 1 speed 70,679,361 years

Kepler-704 b Planet Profile

Physical Specs

Radius

2.61 R⊕

Radius (Jupiter)

0.233 R♃

Mass

7.32 M⊕

Mass (Jupiter)

0.023 M♃

Density

2.26 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.217

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

#999of 1978

top 50.5%

This planet

2.61R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-214 b 2.61 R⊕ GJ 143 b 2.61 R⊕ TOI-1422 c 2.61 R⊕

Metric	Earth	Kepler-704 b	Jupiter
Radius (R⊕)	1.00	2.61	11.21
Mass (M⊕)	1.00	7.32	317.83
Density (g/cm³)	5.51	2.26	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	514.12	0.037

Star Catalogue Identifiers

TIC

TIC 237157729

Gaia DR2

Gaia DR2 2104530027969874944

Gaia DR3

Gaia DR3 2104530027969874944

System

Kepler-704

Percentile among Sub-Neptune cohort

Radius 2.610 R⊕ · percentile 49 / cohort 1978

Mass 7.320 M⊕ · percentile 45 / cohort 1978

Orbital period 3.76 d · percentile 8 / cohort 1946

Distance 1,228.83 pc · percentile 87 / cohort 1975

ESI 0.217 · percentile 9 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.762 days

Semi-major axis

0.0470 AU

Eccentricity

0.000

Inclination

75.62 °

Year Length

A year here lasts approximately 3.76 Earth days (1.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0470 AU.

Transit Fingerprint

Depth

0.051 %

Duration

3.391 h

Impact parameter b

0.590

Rp / R★

0.024994

Transit midpoint (BJD)

2,455,004.9037

Photometric dip

Transit produces a flux drop of 511 ppm lasting ≈ 3.39 h.

Extended Orbital Architecture

Planet / star radius ratio

0.024994

Semi-major axis / stellar radius

3.730

Impact parameter (b)

0.590

Transit mid-time (BJD)

2,455,004.9037

Angular separation (arcsec)

0.03820

Eq. Temperature

1,121K

(848 °C)

Insolation (S⊕)

514.12

Earth = 1.00

Earth Similarity (ESI)

0.217

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-704

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,616 K — cooler than the Sun (5,778 K)

Estimated Age

5.13 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.09

Extended Stellar Properties

Surface gravity (log g)

4.460 dex

Stellar density

0.127 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,228.83 parsec

Light-years 4,007.90 ly

V-band magnitude

15.45 mag

Voyager-speed travel 70,679,361 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.785 mas

Total Proper Motion

8.440 mas/yr

PM Right Ascension

-5.00 mas/yr

PM Declination

-6.80 mas/yr

Galactic Cartesian (pc)

x = 0.172 · y = -0.725 · z = 0.667

Equatorial (J2000)

RA 283.31637° · Dec 41.83709°

Galactic ℓ, b

71.607° · 17.389°

Ecliptic λ, β

293.223° · 64.206°

HTM-20 index

1372305410