Key parameters at a glance

A radius of 2.18 Earth radii
A mass of 5.39 Earth masses
Surface gravity around 1.13 g
An orbital period of 33.420 days
Semi-major axis 0.2091 AU
Equilibrium temperature 581 K (308 °C)
Distance from Earth 1,042.64 light-years
Earth Similarity Index 0.456
Travel time at Voyager 1 speed 18,386,941 years

Kepler-1444 b Planet Profile

Physical Specs

Radius

2.18 R⊕

Radius (Jupiter)

0.194 R♃

Mass

5.39 M⊕

Mass (Jupiter)

0.017 M♃

Density

2.86 g/cm³

Surface Gravity

1.13 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.456

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

#1703of 1978

top 86.0%

This planet

2.18R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 3090 b 2.18 R⊕ Kepler-261 b 2.18 R⊕ Kepler-250 d 2.18 R⊕

Metric	Earth	Kepler-1444 b	Jupiter
Radius (R⊕)	1.00	2.18	11.21
Mass (M⊕)	1.00	5.39	317.83
Density (g/cm³)	5.51	2.86	1.33
Surface Gravity (g)	1.00	1.13	2.53
Insolation (S⊕)	1.00	25.94	0.037

Star Catalogue Identifiers

TIC

TIC 164886812

Gaia DR2

Gaia DR2 2104172854190854528

Gaia DR3

Gaia DR3 2104172854190854528

System

Kepler-1444

Percentile among Sub-Neptune cohort

Radius 2.180 R⊕ · percentile 13 / cohort 1978

Mass 5.390 M⊕ · percentile 14 / cohort 1978

Orbital period 33.42 d · percentile 76 / cohort 1946

Distance 319.68 pc · percentile 36 / cohort 1975

ESI 0.456 · percentile 64 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

33.420 days

Semi-major axis

0.2091 AU

Eccentricity

0.000

Inclination

88.55 °

Year Length

A year here lasts approximately 33.42 Earth days (9.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2091 AU.

Transit Fingerprint

Depth

0.038 %

Duration

5.091 h

Impact parameter b

0.628

Rp / R★

0.018796

Transit midpoint (BJD)

2,454,992.1372

Photometric dip

Transit produces a flux drop of 385 ppm lasting ≈ 5.09 h.

Extended Orbital Architecture

Planet / star radius ratio

0.018796

Semi-major axis / stellar radius

40.200

Impact parameter (b)

0.628

Transit mid-time (BJD)

2,454,992.1372

Angular separation (arcsec)

0.65400

Eq. Temperature

581K

(308 °C)

Insolation (S⊕)

25.94

Earth = 1.00

Earth Similarity (ESI)

0.456

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-1444

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,810 K — hotter than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.050 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.400 dex

Stellar density

1.100 g/cm³

Systemic radial velocity

-29.62 km/s

Metallicity ratio

[Fe/H]

Distance

319.68 parsec

Light-years 1,042.64 ly

V-band magnitude

12.36 mag

Voyager-speed travel 18,386,941 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.099 mas

Total Proper Motion

12.777 mas/yr

PM Right Ascension

9.42 mas/yr

PM Declination

8.63 mas/yr

Galactic Cartesian (pc)

x = 0.196 · y = -0.716 · z = 0.670

Equatorial (J2000)

RA 285.33068° · Dec 42.04050°

Galactic ℓ, b

72.383° · 16.072°

Ecliptic λ, β

296.675° · 64.067°

HTM-20 index

2087925891