Key parameters at a glance

A radius of 0.86 Earth radii
A mass of 0.57 Earth masses
Surface gravity around 0.77 g
An orbital period of 0.985 days
Semi-major axis 0.0182 AU
Equilibrium temperature 2,335 K (2062 °C)
Distance from Earth 2,340.35 light-years
Earth Similarity Index 0.115
Travel time at Voyager 1 speed 41,272,047 years

Kepler-1258 b Planet Profile

Physical Specs

Radius

0.86 R⊕

Radius (Jupiter)

0.077 R♃

Mass

0.57 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.89 g/cm³

Surface Gravity

0.77 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.115

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

#444of 570

top 77.7%

This planet

0.86R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1361 b 0.86 R⊕ Kepler-352 b 0.86 R⊕ Kepler-107 d 0.86 R⊕

Metric	Earth	Kepler-1258 b	Jupiter
Radius (R⊕)	1.00	0.86	11.21
Mass (M⊕)	1.00	0.57	317.83
Density (g/cm³)	5.51	4.89	1.33
Surface Gravity (g)	1.00	0.77	2.53
Insolation (S⊕)	1.00	2,775.00	0.037

Star Catalogue Identifiers

TIC

TIC 279918915

Gaia DR2

Gaia DR2 2132156632006693504

Gaia DR3

Gaia DR3 2132156632006693504

System

Kepler-1258

Percentile among Rocky Terrestrial cohort

Radius 0.860 R⊕ · percentile 21 / cohort 570

Mass 0.566 M⊕ · percentile 17 / cohort 570

Orbital period 0.98 d · percentile 11 / cohort 567

Distance 717.56 pc · percentile 81 / cohort 566

ESI 0.115 · percentile 2 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.985 days

Semi-major axis

0.0182 AU

Eccentricity

0.000

Inclination

89.33 °

Year Length

A year here lasts roughly 23.6 hours long on a nearly circular orbit at a mean orbital distance of 0.0182 AU.

Transit Fingerprint

Depth

0.008 %

Duration

1.954 h

Impact parameter b

0.847

Rp / R★

0.008301

Transit midpoint (BJD)

2,454,966.3196

Photometric dip

Transit produces a flux drop of 81 ppm lasting ≈ 1.95 h.

Extended Orbital Architecture

Planet / star radius ratio

0.008301

Semi-major axis / stellar radius

3.887

Impact parameter (b)

0.847

Transit mid-time (BJD)

2,454,966.3196

Angular separation (arcsec)

0.02540

Eq. Temperature

2,335K

(2062 °C)

Insolation (S⊕)

2,775.00

Earth = 1.00

Earth Similarity (ESI)

0.115

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-1258

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,839 K — hotter than the Sun (5,778 K)

Estimated Age

3.89 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.990 R☉

Stellar Mass

0.990 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

0.660 g/cm³

Metallicity ratio

[Fe/H]

Distance

717.56 parsec

Light-years 2,340.35 ly

V-band magnitude

13.93 mag

Voyager-speed travel 41,272,047 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.365 mas

Total Proper Motion

22.563 mas/yr

PM Right Ascension

1.32 mas/yr

PM Declination

22.52 mas/yr

Galactic Cartesian (pc)

x = 0.171 · y = -0.620 · z = 0.766

Equatorial (J2000)

RA 285.40497° · Dec 49.99482°

Galactic ℓ, b

80.181° · 18.897°

Ecliptic λ, β

302.900° · 71.678°

HTM-20 index

-499352660