Key parameters at a glance

A radius of 1.73 Earth radii
A mass of 3.64 Earth masses
Surface gravity around 1.22 g
An orbital period of 26.084 days
Semi-major axis 0.1681 AU
Equilibrium temperature 598 K (325 °C)
Distance from Earth 6,019.47 light-years
Earth Similarity Index 0.481
Travel time at Voyager 1 speed 106,153,346 years

Kepler-1478 b Planet Profile

Physical Specs

Radius

1.73 R⊕

Radius (Jupiter)

0.154 R♃

Mass

3.64 M⊕

Mass (Jupiter)

0.012 M♃

Density

3.86 g/cm³

Surface Gravity

1.22 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.481

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

#356of 1176

top 30.2%

This planet

1.73R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-327 d 1.73 R⊕ Kepler-1608 b 1.73 R⊕ Kepler-238 b 1.73 R⊕

Metric	Earth	Kepler-1478 b	Jupiter
Radius (R⊕)	1.00	1.73	11.21
Mass (M⊕)	1.00	3.64	317.83
Density (g/cm³)	5.51	3.86	1.33
Surface Gravity (g)	1.00	1.22	2.53
Insolation (S⊕)	1.00	85.28	0.037

Star Catalogue Identifiers

TIC

TIC 138097834

Gaia DR2

Gaia DR2 2077601407662547072

Gaia DR3

Gaia DR3 2077601407662547072

System

Kepler-1478

Percentile among Super-Earth cohort

Radius 1.730 R⊕ · percentile 68 / cohort 1176

Mass 3.640 M⊕ · percentile 62 / cohort 1176

Orbital period 26.08 d · percentile 90 / cohort 1164

Distance 1,845.58 pc · percentile 97 / cohort 1171

ESI 0.481 · percentile 71 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

26.084 days

Semi-major axis

0.1681 AU

Eccentricity

0.000

Inclination

89.84 °

Year Length

A year here lasts approximately 26.08 Earth days (7.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1681 AU.

Transit Fingerprint

Depth

0.026 %

Duration

6.725 h

Impact parameter b

0.151

Rp / R★

0.015391

Transit midpoint (BJD)

2,454,982.4478

Photometric dip

Transit produces a flux drop of 260 ppm lasting ≈ 6.73 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015391

Semi-major axis / stellar radius

29.760

Impact parameter (b)

0.151

Transit mid-time (BJD)

2,454,982.4478

Angular separation (arcsec)

0.09110

Eq. Temperature

598K

(325 °C)

Insolation (S⊕)

85.28

Earth = 1.00

Earth Similarity (ESI)

0.481

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-1478

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,904 K — hotter than the Sun (5,778 K)

Estimated Age

3.98 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.060 R☉

Stellar Mass

1.040 M☉

Metallicity [Fe/H]

0.03

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

0.733 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,845.58 parsec

Light-years 6,019.47 ly

V-band magnitude

15.41 mag

Voyager-speed travel 106,153,346 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.514 mas

Total Proper Motion

15.148 mas/yr

PM Right Ascension

-8.78 mas/yr

PM Declination

-12.34 mas/yr

Galactic Cartesian (pc)

x = 0.294 · y = -0.686 · z = 0.666

Equatorial (J2000)

RA 293.16501° · Dec 41.74618°

Galactic ℓ, b

74.607° · 10.650°

Ecliptic λ, β

308.838° · 62.097°

HTM-20 index

-184553390