Key parameters at a glance

A radius of 3.13 Earth radii
A mass of 9.96 Earth masses
Surface gravity around 1.02 g
An orbital period of 14.532 days
Semi-major axis 0.1083 AU
Equilibrium temperature 664 K (391 °C)
Distance from Earth 1,795.11 light-years
Earth Similarity Index 0.349
Travel time at Voyager 1 speed 31,656,713 years

Kepler-955 b Planet Profile

Physical Specs

Radius

3.13 R⊕

Radius (Jupiter)

0.279 R♃

Mass

9.96 M⊕

Mass (Jupiter)

0.031 M♃

Density

1.78 g/cm³

Surface Gravity

1.02 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.349

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

#406of 1978

top 20.5%

This planet

3.13R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1546 b 3.13 R⊕ Kepler-104 c 3.13 R⊕ Kepler-146 c 3.13 R⊕

Metric	Earth	Kepler-955 b	Jupiter
Radius (R⊕)	1.00	3.13	11.21
Mass (M⊕)	1.00	9.96	317.83
Density (g/cm³)	5.51	1.78	1.33
Surface Gravity (g)	1.00	1.02	2.53
Insolation (S⊕)	1.00	33.09	0.037

Star Catalogue Identifiers

TIC

TIC 121603761

Gaia DR2

Gaia DR2 2101305469605609088

Gaia DR3

Gaia DR3 2101305469605609088

System

Kepler-955

Percentile among Sub-Neptune cohort

Radius 3.130 R⊕ · percentile 79 / cohort 1978

Mass 9.960 M⊕ · percentile 72 / cohort 1978

Orbital period 14.53 d · percentile 49 / cohort 1946

Distance 550.38 pc · percentile 49 / cohort 1975

ESI 0.349 · percentile 41 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

14.532 days

Semi-major axis

0.1083 AU

Eccentricity

0.000

Inclination

90.00 °

Year Length

A year here lasts approximately 14.53 Earth days (4.0% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1083 AU.

Transit Fingerprint

Depth

0.143 %

Duration

3.173 h

Impact parameter b

0.143

Rp / R★

0.034017

Transit midpoint (BJD)

2,454,973.7248

Photometric dip

Transit produces a flux drop of 1,426 ppm lasting ≈ 3.17 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034017

Semi-major axis / stellar radius

35.840

Impact parameter (b)

0.143

Transit mid-time (BJD)

2,454,973.7248

Angular separation (arcsec)

0.19700

Eq. Temperature

664K

(391 °C)

Insolation (S⊕)

33.09

Earth = 1.00

Earth Similarity (ESI)

0.349

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-955

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,350 K — cooler than the Sun (5,778 K)

Estimated Age

4.37 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.840 R☉

Stellar Mass

0.890 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.540 dex

Stellar density

4.122 g/cm³

Metallicity ratio

[Fe/H]

Distance

550.38 parsec

Light-years 1,795.11 ly

V-band magnitude

14.73 mag

Voyager-speed travel 31,656,713 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.788 mas

Total Proper Motion

7.893 mas/yr

PM Right Ascension

6.00 mas/yr

PM Declination

5.13 mas/yr

Galactic Cartesian (pc)

x = 0.242 · y = -0.724 · z = 0.646

Equatorial (J2000)

RA 288.47150° · Dec 40.26982°

Galactic ℓ, b

71.675° · 13.199°

Ecliptic λ, β

300.714° · 61.754°

HTM-20 index

-1475607639