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 15.931 days
Semi-major axis 0.1143 AU
Equilibrium temperature 596 K (323 °C)
Distance from Earth 3,138.22 light-years
Earth Similarity Index 0.458
Travel time at Voyager 1 speed 55,342,464 years

Kepler-1404 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 0.458

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

#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	Kepler-1404 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	39.00	0.037

Star Catalogue Identifiers

TIC

TIC 27766705

Gaia DR2

Gaia DR2 2135354424139022592

Gaia DR3

Gaia DR3 2135354424139022592

System

Kepler-1404

Percentile among Sub-Neptune cohort

Radius 2.010 R⊕ · percentile 1 / cohort 1978

Mass 4.700 M⊕ · percentile 3 / cohort 1978

Orbital period 15.93 d · percentile 53 / cohort 1946

Distance 962.18 pc · percentile 76 / cohort 1975

ESI 0.458 · percentile 64 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

15.931 days

Semi-major axis

0.1143 AU

Eccentricity

0.000

Inclination

89.16 °

Year Length

A year here lasts approximately 15.93 Earth days (4.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1143 AU.

Transit Fingerprint

Depth

0.056 %

Duration

2.710 h

Impact parameter b

0.590

Rp / R★

0.023386

Transit midpoint (BJD)

2,454,974.8114

Photometric dip

Transit produces a flux drop of 557 ppm lasting ≈ 2.71 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023386

Semi-major axis / stellar radius

10.700

Impact parameter (b)

0.590

Transit mid-time (BJD)

2,454,974.8114

Angular separation (arcsec)

0.11900

Eq. Temperature

596K

(323 °C)

Insolation (S⊕)

39.00

Earth = 1.00

Earth Similarity (ESI)

0.458

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

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-1404

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,261 K — cooler than the Sun (5,778 K)

Estimated Age

4.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.800 R☉

Stellar Mass

0.840 M☉

Metallicity [Fe/H]

-0.09

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

3.951 g/cm³

Metallicity ratio

[Fe/H]

Distance

962.18 parsec

Light-years 3,138.22 ly

V-band magnitude

15.93 mag

Voyager-speed travel 55,342,464 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.012 mas

Total Proper Motion

7.180 mas/yr

PM Right Ascension

5.32 mas/yr

PM Declination

4.82 mas/yr

Galactic Cartesian (pc)

x = 0.279 · y = -0.572 · z = 0.772

Equatorial (J2000)

RA 296.00948° · Dec 50.49839°

Galactic ℓ, b

83.480° · 12.888°

Ecliptic λ, β

322.042° · 69.282°

HTM-20 index

-32902365