Key parameters at a glance

A radius of 2.34 Earth radii
A mass of 6.08 Earth masses
Surface gravity around 1.11 g
An orbital period of 5.992 days
Semi-major axis 0.0692 AU
Equilibrium temperature 1,355 K (1082 °C)
Distance from Earth 1,777.76 light-years
Earth Similarity Index 0.183
Travel time at Voyager 1 speed 31,350,720 years

Kepler-999 b Planet Profile

Physical Specs

Radius

2.34 R⊕

Radius (Jupiter)

0.209 R♃

Mass

6.08 M⊕

Mass (Jupiter)

0.019 M♃

Density

2.61 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.183

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

#1429of 1978

top 72.2%

This planet

2.34R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-246 b 2.34 R⊕ Kepler-275 b 2.34 R⊕ Kepler-338 c 2.34 R⊕

Metric	Earth	Kepler-999 b	Jupiter
Radius (R⊕)	1.00	2.34	11.21
Mass (M⊕)	1.00	6.08	317.83
Density (g/cm³)	5.51	2.61	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	740.17	0.037

Star Catalogue Identifiers

TIC

TIC 269032792

Gaia DR2

Gaia DR2 2085286890863482752

Gaia DR3

Gaia DR3 2085286890863482752

System

Kepler-999

Percentile among Sub-Neptune cohort

Radius 2.340 R⊕ · percentile 27 / cohort 1978

Mass 6.080 M⊕ · percentile 26 / cohort 1978

Orbital period 5.99 d · percentile 17 / cohort 1946

Distance 545.06 pc · percentile 49 / cohort 1975

ESI 0.183 · percentile 5 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.992 days

Semi-major axis

0.0692 AU

Eccentricity

0.000

Inclination

85.77 °

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 0.0692 AU.

Transit Fingerprint

Depth

0.018 %

Duration

1.622 h

Impact parameter b

0.164

Rp / R★

0.012500

Transit midpoint (BJD)

2,454,969.8821

Photometric dip

Transit produces a flux drop of 184 ppm lasting ≈ 1.62 h.

Extended Orbital Architecture

Planet / star radius ratio

0.012500

Semi-major axis / stellar radius

28.200

Impact parameter (b)

0.164

Transit mid-time (BJD)

2,454,969.8821

Angular separation (arcsec)

0.12700

Eq. Temperature

1,355K

(1082 °C)

Insolation (S⊕)

740.17

Earth = 1.00

Earth Similarity (ESI)

0.183

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-999

Spectral Class

F-type yellow-white

Effective Temperature

6,237 K — hotter than the Sun (5,778 K)

Estimated Age

3.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.650 R☉

Stellar Mass

1.290 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.110 dex

Stellar density

0.330 g/cm³

Systemic radial velocity

-52.35 km/s

Metallicity ratio

[Fe/H]

Distance

545.06 parsec

Light-years 1,777.76 ly

V-band magnitude

12.36 mag

Voyager-speed travel 31,350,720 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.806 mas

Total Proper Motion

8.462 mas/yr

PM Right Ascension

1.02 mas/yr

PM Declination

8.40 mas/yr

Galactic Cartesian (pc)

x = 0.343 · y = -0.601 · z = 0.722

Equatorial (J2000)

RA 299.66049° · Dec 46.19847°

Galactic ℓ, b

80.841° · 8.687°

Ecliptic λ, β

322.295° · 64.348°

HTM-20 index

-1948748132