Key parameters at a glance

A radius of 1.01 Earth radii
A mass of 1.01 Earth masses
Surface gravity around 0.99 g
An orbital period of 3.239 days
Semi-major axis 0.0442 AU
Equilibrium temperature 1,213 K (940 °C)
Distance from Earth 2,900.92 light-years
Earth Similarity Index 0.262
Travel time at Voyager 1 speed 51,157,655 years

Kepler-1278 b Planet Profile

Physical Specs

Radius

1.01 R⊕

Radius (Jupiter)

0.090 R♃

Mass

1.01 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.39 g/cm³

Surface Gravity

0.99 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.262

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

#326of 570

top 57.0%

This planet

1.01R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-322 b 1.01 R⊕ Kepler-282 b 1.01 R⊕ Kepler-398 c 1.01 R⊕

Metric	Earth	Kepler-1278 b	Jupiter
Radius (R⊕)	1.00	1.01	11.21
Mass (M⊕)	1.00	1.01	317.83
Density (g/cm³)	5.51	5.39	1.33
Surface Gravity (g)	1.00	0.99	2.53
Insolation (S⊕)	1.00	1,314.67	0.037

Star Catalogue Identifiers

TIC

TIC 164413187

Gaia DR2

Gaia DR2 2104972581400204672

Gaia DR3

Gaia DR3 2104972581400204672

System

Kepler-1278

Percentile among Rocky Terrestrial cohort

Radius 1.010 R⊕ · percentile 42 / cohort 570

Mass 1.010 M⊕ · percentile 37 / cohort 570

Orbital period 3.24 d · percentile 36 / cohort 567

Distance 889.43 pc · percentile 91 / cohort 566

ESI 0.262 · percentile 28 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

3.239 days

Semi-major axis

0.0442 AU

Eccentricity

0.000

Inclination

87.54 °

Year Length

A year here lasts approximately 3.24 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0442 AU.

Transit Fingerprint

Depth

0.008 %

Duration

2.654 h

Impact parameter b

0.924

Rp / R★

0.008192

Transit midpoint (BJD)

2,454,966.9844

Photometric dip

Transit produces a flux drop of 77 ppm lasting ≈ 2.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.008192

Semi-major axis / stellar radius

4.050

Impact parameter (b)

0.924

Transit mid-time (BJD)

2,454,966.9844

Angular separation (arcsec)

0.04970

Eq. Temperature

1,213K

(940 °C)

Insolation (S⊕)

1,314.67

Earth = 1.00

Earth Similarity (ESI)

0.262

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1278

Spectral Class

F-type yellow-white

Effective Temperature

6,074 K — hotter than the Sun (5,778 K)

Estimated Age

3.31 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.160 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.350 dex

Stellar density

0.430 g/cm³

Metallicity ratio

[Fe/H]

Distance

889.43 parsec

Light-years 2,900.92 ly

V-band magnitude

13.78 mag

Voyager-speed travel 51,157,655 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.096 mas

Total Proper Motion

9.193 mas/yr

PM Right Ascension

0.17 mas/yr

PM Declination

-9.19 mas/yr

Galactic Cartesian (pc)

x = 0.164 · y = -0.715 · z = 0.680

Equatorial (J2000)

RA 282.95692° · Dec 42.82556°

Galactic ℓ, b

72.477° · 17.990°

Ecliptic λ, β

293.105° · 65.229°

HTM-20 index

581958215