Key parameters at a glance

A radius of 2.98 Earth radii
A mass of 9.17 Earth masses
Surface gravity around 1.03 g
An orbital period of 19.940 days
Semi-major axis 0.1357 AU
Equilibrium temperature 588 K (315 °C)
Distance from Earth 4,582.30 light-years
Earth Similarity Index 0.399
Travel time at Voyager 1 speed 80,808,787 years

Kepler-1299 b Planet Profile

Physical Specs

Radius

2.98 R⊕

Radius (Jupiter)

0.266 R♃

Mass

9.17 M⊕

Mass (Jupiter)

0.029 M♃

Density

1.90 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.399

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

#542of 1978

top 27.4%

This planet

2.98R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-985 b 2.98 R⊕ K2-278 b 2.98 R⊕ Kepler-1881 b 2.98 R⊕

Metric	Earth	Kepler-1299 b	Jupiter
Radius (R⊕)	1.00	2.98	11.21
Mass (M⊕)	1.00	9.17	317.83
Density (g/cm³)	5.51	1.90	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	45.15	0.037

Star Catalogue Identifiers

TIC

TIC 120762000

Gaia DR2

Gaia DR2 2099071433776757888

Gaia DR3

Gaia DR3 2099071433776757888

System

Kepler-1299

Percentile among Sub-Neptune cohort

Radius 2.980 R⊕ · percentile 72 / cohort 1978

Mass 9.170 M⊕ · percentile 66 / cohort 1978

Orbital period 19.94 d · percentile 62 / cohort 1946

Distance 1,404.94 pc · percentile 92 / cohort 1975

ESI 0.399 · percentile 52 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.940 days

Semi-major axis

0.1357 AU

Eccentricity

0.000

Inclination

87.53 °

Year Length

A year here lasts approximately 19.94 Earth days (5.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1357 AU.

Transit Fingerprint

Depth

0.076 %

Duration

4.263 h

Impact parameter b

0.844

Rp / R★

0.029983

Transit midpoint (BJD)

2,454,975.3499

Photometric dip

Transit produces a flux drop of 759 ppm lasting ≈ 4.26 h.

Extended Orbital Architecture

Planet / star radius ratio

0.029983

Semi-major axis / stellar radius

20.000

Impact parameter (b)

0.844

Transit mid-time (BJD)

2,454,975.3499

Angular separation (arcsec)

0.09660

Eq. Temperature

588K

(315 °C)

Insolation (S⊕)

45.15

Earth = 1.00

Earth Similarity (ESI)

0.399

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-1299

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,609 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.910 R☉

Stellar Mass

0.940 M☉

Metallicity [Fe/H]

-0.01

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

0.448 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,404.94 parsec

Light-years 4,582.30 ly

V-band magnitude

15.96 mag

Voyager-speed travel 80,808,787 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.684 mas

Total Proper Motion

9.577 mas/yr

PM Right Ascension

-4.06 mas/yr

PM Declination

-8.67 mas/yr

Galactic Cartesian (pc)

x = 0.221 · y = -0.763 · z = 0.608

Equatorial (J2000)

RA 286.15013° · Dec 37.41134°

Galactic ℓ, b

68.233° · 13.677°

Ecliptic λ, β

295.732° · 59.416°

HTM-20 index

930494024