Key parameters at a glance

A radius of 3.26 Earth radii
A mass of 10.70 Earth masses
Surface gravity around 1.01 g
An orbital period of 105.303 days
Semi-major axis 0.4238 AU
Equilibrium temperature 351 K (78 °C)
Distance from Earth 2,981.48 light-years
Earth Similarity Index 0.599
Travel time at Voyager 1 speed 52,578,340 years

Kepler-987 b Planet Profile

Physical Specs

Radius

3.26 R⊕

Radius (Jupiter)

0.291 R♃

Mass

10.70 M⊕

Mass (Jupiter)

0.034 M♃

Density

1.70 g/cm³

Surface Gravity

1.01 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.599

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

#305of 1978

top 15.4%

This planet

3.26R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-348 b 3.26 R⊕ Kepler-368 b 3.26 R⊕ Kepler-287 c 3.26 R⊕

Metric	Earth	Kepler-987 b	Jupiter
Radius (R⊕)	1.00	3.26	11.21
Mass (M⊕)	1.00	10.70	317.83
Density (g/cm³)	5.51	1.70	1.33
Surface Gravity (g)	1.00	1.01	2.53
Insolation (S⊕)	1.00	3.85	0.037

Star Catalogue Identifiers

TIC

TIC 159050004

Gaia DR2

Gaia DR2 2127688938307214592

Gaia DR3

Gaia DR3 2127688938307214592

System

Kepler-987

Percentile among Sub-Neptune cohort

Radius 3.260 R⊕ · percentile 84 / cohort 1978

Mass 10.700 M⊕ · percentile 78 / cohort 1978

Orbital period 105.30 d · percentile 94 / cohort 1946

Distance 914.13 pc · percentile 73 / cohort 1975

ESI 0.599 · percentile 82 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

105.303 days

Semi-major axis

0.4238 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 105.30 Earth days (28.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.4238 AU.

Transit Fingerprint

Depth

0.133 %

Duration

6.120 h

Impact parameter b

0.027

Rp / R★

0.033352

Transit midpoint (BJD)

2,455,040.1734

Photometric dip

Transit produces a flux drop of 1,330 ppm lasting ≈ 6.12 h.

Extended Orbital Architecture

Planet / star radius ratio

0.033352

Semi-major axis / stellar radius

135.680

Impact parameter (b)

0.027

Transit mid-time (BJD)

2,455,040.1734

Angular separation (arcsec)

0.46400

Eq. Temperature

351K

(78 °C)

Insolation (S⊕)

3.85

Earth = 1.00

Earth Similarity (ESI)

0.599

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure.

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-987

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,637 K — cooler than the Sun (5,778 K)

Estimated Age

2.45 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.910 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.510 dex

Stellar density

4.078 g/cm³

Metallicity ratio

[Fe/H]

Distance

914.13 parsec

Light-years 2,981.48 ly

V-band magnitude

15.17 mag

Voyager-speed travel 52,578,340 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.065 mas

Total Proper Motion

1.991 mas/yr

PM Right Ascension

0.34 mas/yr

PM Declination

-1.96 mas/yr

Galactic Cartesian (pc)

x = 0.230 · y = -0.654 · z = 0.721

Equatorial (J2000)

RA 289.41106° · Dec 46.13084°

Galactic ℓ, b

77.478° · 14.973°

Ecliptic λ, β

306.350° · 67.136°

HTM-20 index

1898649090