Key parameters at a glance

A radius of 3.75 Earth radii
A mass of 13.50 Earth masses
Surface gravity around 0.96 g
An orbital period of 20.553 days
Semi-major axis 0.1542 AU
Equilibrium temperature 749 K (476 °C)
Distance from Earth 3,855.88 light-years
Earth Similarity Index 0.287
Travel time at Voyager 1 speed 67,998,466 years

Kepler-873 b Planet Profile

Physical Specs

Radius

3.75 R⊕

Radius (Jupiter)

0.335 R♃

Mass

13.50 M⊕

Mass (Jupiter)

0.043 M♃

Density

1.41 g/cm³

Surface Gravity

0.96 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.287

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

#72of 1978

top 3.6%

This planet

3.75R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-715 b 3.75 R⊕ TOI-682.01 3.74 R⊕ DMPP-6 c 3.74 R⊕

Metric	Earth	Kepler-873 b	Jupiter
Radius (R⊕)	1.00	3.75	11.21
Mass (M⊕)	1.00	13.50	317.83
Density (g/cm³)	5.51	1.41	1.33
Surface Gravity (g)	1.00	0.96	2.53
Insolation (S⊕)	1.00	68.02	0.037

Star Catalogue Identifiers

TIC

TIC 27843860

Gaia DR2

Gaia DR2 2135506706499750656

Gaia DR3

Gaia DR3 2135506706499750656

System

Kepler-873

Percentile among Sub-Neptune cohort

Radius 3.750 R⊕ · percentile 96 / cohort 1978

Mass 13.500 M⊕ · percentile 89 / cohort 1978

Orbital period 20.55 d · percentile 63 / cohort 1946

Distance 1,182.22 pc · percentile 86 / cohort 1975

ESI 0.287 · percentile 25 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

20.553 days

Semi-major axis

0.1542 AU

Eccentricity

0.000

Inclination

87.62 °

Year Length

A year here lasts approximately 20.55 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1542 AU.

Transit Fingerprint

Depth

0.068 %

Duration

5.099 h

Impact parameter b

0.680

Rp / R★

0.026755

Transit midpoint (BJD)

2,454,972.5582

Photometric dip

Transit produces a flux drop of 678 ppm lasting ≈ 5.10 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026755

Semi-major axis / stellar radius

23.800

Impact parameter (b)

0.680

Transit mid-time (BJD)

2,454,972.5582

Angular separation (arcsec)

0.13000

Eq. Temperature

749K

(476 °C)

Insolation (S⊕)

68.02

Earth = 1.00

Earth Similarity (ESI)

0.287

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-873

Spectral Class

F-type yellow-white

Effective Temperature

6,163 K — hotter than the Sun (5,778 K)

Estimated Age

2.95 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.270 R☉

Stellar Mass

1.180 M☉

Metallicity [Fe/H]

0.07

Extended Stellar Properties

Surface gravity (log g)

4.290 dex

Stellar density

0.316 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,182.22 parsec

Light-years 3,855.88 ly

V-band magnitude

15.05 mag

Voyager-speed travel 67,998,466 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.817 mas

Total Proper Motion

13.938 mas/yr

PM Right Ascension

-4.96 mas/yr

PM Declination

-13.03 mas/yr

Galactic Cartesian (pc)

x = 0.278 · y = -0.560 · z = 0.780

Equatorial (J2000)

RA 296.40313° · Dec 51.27128°

Galactic ℓ, b

84.302° · 13.022°

Ecliptic λ, β

323.769° · 69.825°

HTM-20 index

-48497042