Key parameters at a glance

A radius of 3.05 Earth radii
A mass of 9.53 Earth masses
Surface gravity around 1.02 g
An orbital period of 85.735 days
Semi-major axis 0.3877 AU
Equilibrium temperature 448 K (175 °C)
Distance from Earth 3,833.05 light-years
Earth Similarity Index 0.505
Travel time at Voyager 1 speed 67,595,843 years

Kepler-1204 b Planet Profile

Physical Specs

Radius

3.05 R⊕

Radius (Jupiter)

0.272 R♃

Mass

9.53 M⊕

Mass (Jupiter)

0.030 M♃

Density

1.85 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.505

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

#472of 1978

top 23.8%

This planet

3.05R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1518 b 3.05 R⊕ HD 168009 b 3.05 R⊕ Kepler-791 b 3.05 R⊕

Metric	Earth	Kepler-1204 b	Jupiter
Radius (R⊕)	1.00	3.05	11.21
Mass (M⊕)	1.00	9.53	317.83
Density (g/cm³)	5.51	1.85	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	7.02	0.037

Star Catalogue Identifiers

TIC

TIC 159043952

Gaia DR2

Gaia DR2 2102648832296149888

Gaia DR3

Gaia DR3 2102648832296149888

System

Kepler-1204

Percentile among Sub-Neptune cohort

Radius 3.050 R⊕ · percentile 76 / cohort 1978

Mass 9.530 M⊕ · percentile 69 / cohort 1978

Orbital period 85.74 d · percentile 92 / cohort 1946

Distance 1,175.22 pc · percentile 86 / cohort 1975

ESI 0.505 · percentile 71 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

85.735 days

Semi-major axis

0.3877 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 85.74 Earth days (23.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3877 AU.

Transit Fingerprint

Depth

0.084 %

Duration

7.457 h

Impact parameter b

0.797

Rp / R★

0.026705

Transit midpoint (BJD)

2,455,003.9855

Photometric dip

Transit produces a flux drop of 843 ppm lasting ≈ 7.46 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026705

Semi-major axis / stellar radius

88.010

Impact parameter (b)

0.797

Transit mid-time (BJD)

2,455,003.9855

Angular separation (arcsec)

0.33000

Eq. Temperature

448K

(175 °C)

Insolation (S⊕)

7.02

Earth = 1.00

Earth Similarity (ESI)

0.505

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-1204

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,825 K — hotter than the Sun (5,778 K)

Estimated Age

4.27 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.030 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

1.739 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,175.22 parsec

Light-years 3,833.05 ly

V-band magnitude

15.45 mag

Voyager-speed travel 67,595,843 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.822 mas

Total Proper Motion

3.797 mas/yr

PM Right Ascension

3.78 mas/yr

PM Declination

0.36 mas/yr

Galactic Cartesian (pc)

x = 0.245 · y = -0.695 · z = 0.676

Equatorial (J2000)

RA 289.44152° · Dec 42.49815°

Galactic ℓ, b

74.069° · 13.464°

Ecliptic λ, β

303.611° · 63.686°

HTM-20 index

947051460