Key parameters at a glance

A radius of 0.87 Earth radii
A mass of 0.59 Earth masses
Surface gravity around 0.78 g
An orbital period of 5.993 days
Semi-major axis 0.0629 AU
Equilibrium temperature 1,010 K (737 °C)
Distance from Earth 1,301.73 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 22,956,082 years

3 siblings around Kepler-1542

Kepler-1542 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-1542 c	Rocky Terrestrial	0.65	0.21	2.892	1,287	2016
Kepler-1542 b	Rocky Terrestrial	0.76	0.36	3.951	1,160	2016
Kepler-1542 e	Rocky Terrestrial	0.76	0.36	5.101	1,065	2016
Kepler-1542 d this	Rocky Terrestrial	0.87	0.59	5.993	1,010	2016

Kepler-1542 d Planet Profile

Physical Specs

Radius

0.87 R⊕

Radius (Jupiter)

0.078 R♃

Mass

0.59 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.92 g/cm³

Surface Gravity

0.78 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.308

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

#435of 570

top 76.1%

This planet

0.87R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1152 b 0.87 R⊕ Kepler-1031 b 0.87 R⊕ Kepler-607 b 0.87 R⊕

Metric	Earth	Kepler-1542 d	Jupiter
Radius (R⊕)	1.00	0.87	11.21
Mass (M⊕)	1.00	0.59	317.83
Density (g/cm³)	5.51	4.92	1.33
Surface Gravity (g)	1.00	0.78	2.53
Insolation (S⊕)	1.00	297.81	0.037

Star Catalogue Identifiers

TIC

TIC 279915941

Gaia DR2

Gaia DR2 2105526799680172032

Gaia DR3

Gaia DR3 2105526799680172032

System

Kepler-1542

Percentile among Rocky Terrestrial cohort

Radius 0.870 R⊕ · percentile 23 / cohort 570

Mass 0.590 M⊕ · percentile 19 / cohort 570

Orbital period 5.99 d · percentile 61 / cohort 567

Distance 399.11 pc · percentile 52 / cohort 566

ESI 0.308 · percentile 41 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

5.993 days

Semi-major axis

0.0629 AU

Eccentricity

0.000

Inclination

88.08 °

Year Length

A year here lasts approximately 5.99 Earth days (1.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0629 AU.

Transit Fingerprint

Depth

0.007 %

Duration

2.549 h

Impact parameter b

0.226

Rp / R★

0.007947

Transit midpoint (BJD)

2,454,964.7486

Photometric dip

Transit produces a flux drop of 70 ppm lasting ≈ 2.55 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007947

Semi-major axis / stellar radius

17.650

Impact parameter (b)

0.226

Transit mid-time (BJD)

2,454,964.7486

Angular separation (arcsec)

0.15800

Eq. Temperature

1,010K

(737 °C)

Insolation (S⊕)

297.81

Earth = 1.00

Earth Similarity (ESI)

0.308

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-1542

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,564 K — cooler than the Sun (5,778 K)

Estimated Age

8.51 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.990 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.410 dex

Stellar density

0.580 g/cm³

Systemic radial velocity

-8.14 km/s

Metallicity ratio

[Fe/H]

Distance

399.11 parsec

Light-years 1,301.73 ly

V-band magnitude

12.73 mag

Voyager-speed travel 22,956,082 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.477 mas

Total Proper Motion

15.501 mas/yr

PM Right Ascension

-2.83 mas/yr

PM Declination

-15.24 mas/yr

Galactic Cartesian (pc)

x = 0.199 · y = -0.708 · z = 0.678

Equatorial (J2000)

RA 285.72848° · Dec 42.65447°

Galactic ℓ, b

73.091° · 16.034°

Ecliptic λ, β

297.681° · 64.589°

HTM-20 index

1165934271