Key parameters at a glance

A radius of 0.82 Earth radii
A mass of 0.48 Earth masses
Surface gravity around 0.71 g
An orbital period of 0.690 days
Semi-major axis 0.0141 AU
Equilibrium temperature 1,539 K (1266 °C)
Distance from Earth 496.00 light-years
Earth Similarity Index 0.188
Travel time at Voyager 1 speed 8,746,990 years
Almost certainly tidally locked to its host star given the close orbit

Kepler-1446 b Planet Profile

Physical Specs

Radius

0.82 R⊕

Radius (Jupiter)

0.073 R♃

Mass

0.48 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.75 g/cm³

Surface Gravity

0.71 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.188

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

#465of 570

top 81.4%

This planet

0.82R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-32 f 0.82 R⊕ Kepler-106 b 0.82 R⊕ Kepler-390 b 0.82 R⊕

Metric	Earth	Kepler-1446 b	Jupiter
Radius (R⊕)	1.00	0.82	11.21
Mass (M⊕)	1.00	0.48	317.83
Density (g/cm³)	5.51	4.75	1.33
Surface Gravity (g)	1.00	0.71	2.53
Insolation (S⊕)	1.00	1,213.33	0.037

Star Catalogue Identifiers

TIC

TIC 159050852

Gaia DR2

Gaia DR2 2127777307254217472

Gaia DR3

Gaia DR3 2127777307254217472

System

Kepler-1446

Percentile among Rocky Terrestrial cohort

Radius 0.820 R⊕ · percentile 17 / cohort 570

Mass 0.477 M⊕ · percentile 15 / cohort 570

Orbital period 0.69 d · percentile 6 / cohort 567

Distance 152.08 pc · percentile 27 / cohort 566

ESI 0.188 · percentile 12 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.690 days

Semi-major axis

0.0141 AU

Eccentricity

0.000

Inclination

88.50 °

Year Length

A year here lasts roughly 16.6 hours long on a nearly circular orbit at a mean orbital distance of 0.0140 AU.

Transit Fingerprint

Depth

0.012 %

Duration

1.214 h

Impact parameter b

0.119

Rp / R★

0.009762

Transit midpoint (BJD)

2,454,964.6352

Photometric dip

Transit produces a flux drop of 121 ppm lasting ≈ 1.21 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009762

Semi-major axis / stellar radius

4.561

Impact parameter (b)

0.119

Transit mid-time (BJD)

2,454,964.6352

Angular separation (arcsec)

0.09240

Eq. Temperature

1,539K

(1266 °C)

Insolation (S⊕)

1,213.33

Earth = 1.00

Earth Similarity (ESI)

0.188

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

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-1446

Spectral Class

K-type orange

Effective Temperature

4,865 K — cooler than the Sun (5,778 K)

Estimated Age

2.63 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.750 R☉

Stellar Mass

0.810 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.600 dex

Stellar density

2.130 g/cm³

Systemic radial velocity

-31.77 km/s

Metallicity ratio

[Fe/H]

Distance

152.08 parsec

Light-years 496.00 ly

V-band magnitude

12.60 mag

Voyager-speed travel 8,746,990 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

6.547 mas

Total Proper Motion

23.016 mas/yr

PM Right Ascension

12.32 mas/yr

PM Declination

-19.44 mas/yr

Galactic Cartesian (pc)

x = 0.228 · y = -0.646 · z = 0.728

Equatorial (J2000)

RA 289.42404° · Dec 46.72608°

Galactic ℓ, b

78.046° · 15.204°

Ecliptic λ, β

306.906° · 67.692°

HTM-20 index

1766629347