Key parameters at a glance

A radius of 1.58 Earth radii
A mass of 3.12 Earth masses
Surface gravity around 1.25 g
An orbital period of 2.984 days
Semi-major axis 0.0217 AU
Equilibrium temperature 401 K (128 °C)
Distance from Earth 414.87 light-years
Earth Similarity Index 0.703
Travel time at Voyager 1 speed 7,316,297 years
Almost certainly tidally locked to its host star given the close orbit

Context from the literature

Kepler-445 is a red dwarf star located 401 light-years away in the constellation Cygnus. It hosts three known exoplanets, discovered by the transit method using data from the Kepler space telescope and confirmed in 2015. None of the planets orbit within the habitable zone.

Excerpted from Wikipedia · full article

2 siblings around Kepler-445

Kepler-445 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-445 b this	Super-Earth	1.58	3.12	2.984	401	2015
Kepler-445 c	Sub-Neptune	2.51	6.85	4.871	341	2015
Kepler-445 d	Super-Earth	1.25	2.10	8.153	305	2015

Kepler-445 b Planet Profile

Physical Specs

Radius

1.58 R⊕

Radius (Jupiter)

0.140 R♃

Mass

3.12 M⊕

Mass (Jupiter)

0.010 M♃

Density

4.35 g/cm³

Surface Gravity

1.25 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.703

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#603of 1176

top 51.2%

This planet

1.58R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-126 c 1.58 R⊕ Kepler-111 b 1.58 R⊕ Kepler-386 c 1.58 R⊕

Metric	Earth	Kepler-445 b	Jupiter
Radius (R⊕)	1.00	1.58	11.21
Mass (M⊕)	1.00	3.12	317.83
Density (g/cm³)	5.51	4.35	1.33
Surface Gravity (g)	1.00	1.25	2.53
Insolation (S⊕)	1.00	17.66	0.037

Star Catalogue Identifiers

TIC

TIC 268060194

Gaia DR2

Gaia DR2 2085482775729637376

Gaia DR3

Gaia DR3 2085482775729637376

System

Kepler-445

Percentile among Super-Earth cohort

Radius 1.580 R⊕ · percentile 48 / cohort 1176

Mass 3.120 M⊕ · percentile 44 / cohort 1176

Orbital period 2.98 d · percentile 21 / cohort 1164

Distance 127.20 pc · percentile 19 / cohort 1171

ESI 0.703 · percentile 85 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

2.984 days

Semi-major axis

0.0217 AU

Eccentricity

0.000

Inclination

89.74 °

Year Length

A year here lasts approximately 2.98 Earth days (0.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0217 AU.

Transit Fingerprint

Depth

0.260 %

Duration

1.030 h

Impact parameter b

0.001

Rp / R★

0.067600

Transit midpoint (BJD)

2,454,966.1194

Photometric dip

Transit produces a flux drop of 2,598 ppm lasting ≈ 1.03 h.

Extended Orbital Architecture

Planet / star radius ratio

0.067600

Semi-major axis / stellar radius

21.940

Impact parameter (b)

0.001

Transit mid-time (BJD)

2,454,966.1194

Angular separation (arcsec)

0.17100

Eq. Temperature

401K

(128 °C)

Insolation (S⊕)

17.66

Earth = 1.00

Earth Similarity (ESI)

0.703

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Muirhead et al. 2015

Instrument

Kepler CCD Array

Publication

2015-03

Observation locale

Space

Discovery cohort

Planets confirmed in 2015 at Kepler (12 shown).

Kepler-438 b · Rocky Terrestrial Kepler-445 d · Super-Earth Kepler-442 b · Super-Earth Kepler-439 b · Sub-Neptune Kepler-437 b · Sub-Neptune Kepler-440 b · Super-Earth KIC 8540376 c · Sub-Neptune Kepler-446 d · Super-Earth Kepler-436 b · Sub-Neptune Kepler-445 c · Sub-Neptune Kepler-443 b · Sub-Neptune Kepler-441 b · Super-Earth

Host System: Kepler-445

Spectral Class

M-type red dwarf

Effective Temperature

3,157 K — cooler than the Sun (5,778 K)

Estimated Age

6.61 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.210 R☉

Stellar Mass

0.180 M☉

Metallicity [Fe/H]

0.27

Extended Stellar Properties

Surface gravity (log g)

4.925 dex

Stellar density

14.393 g/cm³

Systemic radial velocity

-61.00 km/s

Metallicity ratio

[Fe/H]

Distance

127.20 parsec

Light-years 414.87 ly

V-band magnitude

18.19 mag

Voyager-speed travel 7,316,297 yr

Multi-band Host Photometry — 14 bands

Astrometric Data

Parallax

7.833 mas

Total Proper Motion

138.540 mas/yr

PM Right Ascension

41.52 mas/yr

PM Declination

132.17 mas/yr

Galactic Cartesian (pc)

x = 0.331 · y = -0.604 · z = 0.725

Equatorial (J2000)

RA 298.73634° · Dec 46.49912°

Galactic ℓ, b

80.780° · 9.390°

Ecliptic λ, β

321.285° · 64.904°

HTM-20 index

31717645

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