Key parameters at a glance

A radius of 2.68 Earth radii
A mass of 7.65 Earth masses
Surface gravity around 1.07 g
An orbital period of 19.179 days
Semi-major axis 0.1392 AU
Equilibrium temperature 640 K (367 °C)
Distance from Earth 4,065.31 light-years
Earth Similarity Index 0.384
Travel time at Voyager 1 speed 71,691,671 years

Kepler-899 b Planet Profile

Physical Specs

Radius

2.68 R⊕

Radius (Jupiter)

0.239 R♃

Mass

7.65 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.18 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.384

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

#896of 1978

top 45.2%

This planet

2.68R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-487 c 2.68 R⊕ Kepler-1184 b 2.68 R⊕ K2-58 b 2.68 R⊕

Metric	Earth	Kepler-899 b	Jupiter
Radius (R⊕)	1.00	2.68	11.21
Mass (M⊕)	1.00	7.65	317.83
Density (g/cm³)	5.51	2.18	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	62.20	0.037

Star Catalogue Identifiers

TIC

TIC 169557750

Gaia DR2

Gaia DR2 2073746932220288256

Gaia DR3

Gaia DR3 2073746932220288256

System

Kepler-899

Percentile among Sub-Neptune cohort

Radius 2.680 R⊕ · percentile 54 / cohort 1978

Mass 7.650 M⊕ · percentile 50 / cohort 1978

Orbital period 19.18 d · percentile 61 / cohort 1946

Distance 1,246.43 pc · percentile 88 / cohort 1975

ESI 0.384 · percentile 49 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.179 days

Semi-major axis

0.1392 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 19.18 Earth days (5.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1392 AU.

Transit Fingerprint

Depth

0.075 %

Duration

5.200 h

Impact parameter b

0.004

Rp / R★

0.026691

Transit midpoint (BJD)

2,454,972.7466

Photometric dip

Transit produces a flux drop of 753 ppm lasting ≈ 5.20 h.

Extended Orbital Architecture

Planet / star radius ratio

0.026691

Semi-major axis / stellar radius

29.200

Impact parameter (b)

0.004

Transit mid-time (BJD)

2,454,972.7466

Angular separation (arcsec)

0.11200

Eq. Temperature

640K

(367 °C)

Insolation (S⊕)

62.20

Earth = 1.00

Earth Similarity (ESI)

0.384

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-899

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,595 K — cooler than the Sun (5,778 K)

Estimated Age

4.07 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.910 R☉

Stellar Mass

0.930 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.280 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,246.43 parsec

Light-years 4,065.31 ly

V-band magnitude

15.71 mag

Voyager-speed travel 71,691,671 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.774 mas

Total Proper Motion

10.510 mas/yr

PM Right Ascension

-5.97 mas/yr

PM Declination

-8.65 mas/yr

Galactic Cartesian (pc)

x = 0.350 · y = -0.673 · z = 0.652

Equatorial (J2000)

RA 297.48256° · Dec 40.68074°

Galactic ℓ, b

75.221° · 7.287°

Ecliptic λ, β

314.348° · 59.959°

HTM-20 index

-120191079