Key parameters at a glance

A radius of 1.23 Earth radii
A mass of 2.04 Earth masses
Surface gravity around 1.35 g
An orbital period of 2.295 days
Semi-major axis 0.0335 AU
Equilibrium temperature 1,304 K (1031 °C)
Distance from Earth 1,270.04 light-years
Earth Similarity Index 0.230
Travel time at Voyager 1 speed 22,397,184 years

Kepler-1055 b Planet Profile

Physical Specs

Radius

1.23 R⊕

Radius (Jupiter)

0.110 R♃

Mass

2.04 M⊕

Mass (Jupiter)

0.006 M♃

Density

6.02 g/cm³

Surface Gravity

1.35 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.230

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

#17of 570

top 2.8%

This planet

1.23R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-252 b 1.23 R⊕ Kepler-271 b 1.23 R⊕ Kepler-197 c 1.23 R⊕

Metric	Earth	Kepler-1055 b	Jupiter
Radius (R⊕)	1.00	1.23	11.21
Mass (M⊕)	1.00	2.04	317.83
Density (g/cm³)	5.51	6.02	1.33
Surface Gravity (g)	1.00	1.35	2.53
Insolation (S⊕)	1.00	647.26	0.037

Star Catalogue Identifiers

TIC

TIC 159440697

Gaia DR2

Gaia DR2 2127020229079881856

Gaia DR3

Gaia DR3 2127020229079881856

System

Kepler-1055

Percentile among Rocky Terrestrial cohort

Radius 1.230 R⊕ · percentile 94 / cohort 570

Mass 2.040 M⊕ · percentile 86 / cohort 570

Orbital period 2.30 d · percentile 26 / cohort 567

Distance 389.40 pc · percentile 51 / cohort 566

ESI 0.230 · percentile 20 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.295 days

Semi-major axis

0.0335 AU

Eccentricity

0.000

Inclination

89.14 °

Year Length

A year here lasts approximately 2.30 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0335 AU.

Transit Fingerprint

Depth

0.017 %

Duration

1.646 h

Impact parameter b

0.160

Rp / R★

0.011982

Transit midpoint (BJD)

2,454,965.6928

Photometric dip

Transit produces a flux drop of 171 ppm lasting ≈ 1.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011982

Semi-major axis / stellar radius

10.710

Impact parameter (b)

0.160

Transit mid-time (BJD)

2,454,965.6928

Angular separation (arcsec)

0.08600

Eq. Temperature

1,304K

(1031 °C)

Insolation (S⊕)

647.26

Earth = 1.00

Earth Similarity (ESI)

0.230

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-1055

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,723 K — cooler than the Sun (5,778 K)

Estimated Age

3.09 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.940 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.490 dex

Stellar density

1.420 g/cm³

Metallicity ratio

[Fe/H]

Distance

389.40 parsec

Light-years 1,270.04 ly

V-band magnitude

13.19 mag

Voyager-speed travel 22,397,184 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.539 mas

Total Proper Motion

11.643 mas/yr

PM Right Ascension

-0.76 mas/yr

PM Declination

-11.62 mas/yr

Galactic Cartesian (pc)

x = 0.248 · y = -0.663 · z = 0.706

Equatorial (J2000)

RA 290.48678° · Dec 44.93254°

Galactic ℓ, b

76.670° · 13.793°

Ecliptic λ, β

307.106° · 65.753°

HTM-20 index

1529143378