Key parameters at a glance

A radius of 2.83 Earth radii
A mass of 8.40 Earth masses
Surface gravity around 1.05 g
An orbital period of 2.168 days
Semi-major axis 0.0337 AU
Equilibrium temperature 1,558 K (1285 °C)
Distance from Earth 3,335.92 light-years
Earth Similarity Index 0.144
Travel time at Voyager 1 speed 58,829,009 years

Kepler-1099 b Planet Profile

Physical Specs

Radius

2.83 R⊕

Radius (Jupiter)

0.252 R♃

Mass

8.40 M⊕

Mass (Jupiter)

0.026 M♃

Density

2.04 g/cm³

Surface Gravity

1.05 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.144

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

#703of 1978

top 35.5%

This planet

2.83R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

HD 3167 e 2.83 R⊕ GJ 3634 b 2.83 R⊕ Kepler-264 c 2.83 R⊕

Metric	Earth	Kepler-1099 b	Jupiter
Radius (R⊕)	1.00	2.83	11.21
Mass (M⊕)	1.00	8.40	317.83
Density (g/cm³)	5.51	2.04	1.33
Surface Gravity (g)	1.00	1.05	2.53
Insolation (S⊕)	1.00	766.34	0.037

Star Catalogue Identifiers

TIC

TIC 299033164

Gaia DR2

Gaia DR2 2130969503047357952

Gaia DR3

Gaia DR3 2130969503047357952

System

Kepler-1099

Percentile among Sub-Neptune cohort

Radius 2.830 R⊕ · percentile 64 / cohort 1978

Mass 8.400 M⊕ · percentile 58 / cohort 1978

Orbital period 2.17 d · percentile 2 / cohort 1946

Distance 1,022.80 pc · percentile 79 / cohort 1975

ESI 0.144 · percentile 2 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

2.168 days

Semi-major axis

0.0337 AU

Eccentricity

0.000

Inclination

88.96 °

Year Length

A year here lasts approximately 2.17 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0337 AU.

Transit Fingerprint

Depth

0.047 %

Duration

1.661 h

Impact parameter b

0.950

Rp / R★

0.025668

Transit midpoint (BJD)

2,454,965.1408

Photometric dip

Transit produces a flux drop of 467 ppm lasting ≈ 1.66 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025668

Semi-major axis / stellar radius

4.000

Impact parameter (b)

0.950

Transit mid-time (BJD)

2,454,965.1408

Angular separation (arcsec)

0.03290

Eq. Temperature

1,558K

(1285 °C)

Insolation (S⊕)

766.34

Earth = 1.00

Earth Similarity (ESI)

0.144

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-1099

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,837 K — hotter than the Sun (5,778 K)

Estimated Age

3.63 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.000 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

5.906 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,022.80 parsec

Light-years 3,335.92 ly

V-band magnitude

15.14 mag

Voyager-speed travel 58,829,009 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.949 mas

Total Proper Motion

13.213 mas/yr

PM Right Ascension

-2.81 mas/yr

PM Declination

-12.91 mas/yr

Galactic Cartesian (pc)

x = 0.214 · y = -0.630 · z = 0.746

Equatorial (J2000)

RA 288.74999° · Dec 48.27712°

Galactic ℓ, b

79.341° · 16.233°

Ecliptic λ, β

307.247° · 69.304°

HTM-20 index

280783595