Key parameters at a glance

A radius of 0.74 Earth radii
A mass of 0.33 Earth masses
Surface gravity around 0.60 g
An orbital period of 1.717 days
Semi-major axis 0.0280 AU
Equilibrium temperature 1,455 K (1182 °C)
Distance from Earth 368.64 light-years
Earth Similarity Index 0.195
Travel time at Voyager 1 speed 6,500,928 years

1 sibling around Kepler-1869

Kepler-1869 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-1869 c this	Rocky Terrestrial	0.74	0.33	1.717	1,455	2023
Kepler-1869 b	Rocky Terrestrial	1.12	1.46	8.167	865	2021

Kepler-1869 c Planet Profile

Physical Specs

Radius

0.74 R⊕

Radius (Jupiter)

0.066 R♃

Mass

0.33 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.47 g/cm³

Surface Gravity

0.60 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.195

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#514of 570

top 90.0%

This planet

0.74R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-125 c 0.74 R⊕ Kepler-345 b 0.74 R⊕ Kepler-444 f 0.74 R⊕

Metric	Earth	Kepler-1869 c	Jupiter
Radius (R⊕)	1.00	0.74	11.21
Mass (M⊕)	1.00	0.33	317.83
Density (g/cm³)	5.51	4.47	1.33
Surface Gravity (g)	1.00	0.60	2.53
Insolation (S⊕)	1.00	1,056.84	0.037

Star Catalogue Identifiers

TIC

TIC 63368895

Gaia DR2

Gaia DR2 2125751461382627840

Gaia DR3

Gaia DR3 2125751461382627840

System

Kepler-1869

Percentile among Rocky Terrestrial cohort

Radius 0.740 R⊕ · percentile 9 / cohort 570

Mass 0.330 M⊕ · percentile 8 / cohort 570

Orbital period 1.72 d · percentile 19 / cohort 567

Distance 113.03 pc · percentile 25 / cohort 566

ESI 0.195 · percentile 13 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

1.717 days

Semi-major axis

0.0280 AU

Eccentricity

0.000

Inclination

81.38 °

Year Length

A year here lasts approximately 1.72 Earth days (0.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0280 AU.

Transit Fingerprint

Depth

0.006 %

Duration

2.068 h

Impact parameter b

0.700

Rp / R★

0.007546

Transit midpoint (BJD)

2,454,965.0320

Photometric dip

Transit produces a flux drop of 60 ppm lasting ≈ 2.07 h.

Extended Orbital Architecture

Planet / star radius ratio

0.007546

Semi-major axis / stellar radius

4.670

Impact parameter (b)

0.700

Transit mid-time (BJD)

2,454,965.0320

Angular separation (arcsec)

0.24800

Eq. Temperature

1,455K

(1182 °C)

Insolation (S⊕)

1,056.84

Earth = 1.00

Earth Similarity (ESI)

0.195

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

Discovery Paper

Primary reference

Valizadegan et al. 2023

Instrument

Kepler CCD Array

Publication

2023-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Kepler (12 shown).

Kepler-1126 c · Super-Earth Kepler-2000 c · Super-Earth Kepler-1052 c · Sub-Neptune Kepler-311 d · Sub-Neptune Kepler-1996 c · Sub-Neptune Kepler-1162 c · Super-Earth Kepler-1996 b · Sub-Neptune Kepler-1610 c · Sub-Neptune Kepler-1801 c · Sub-Neptune Kepler-1995 b · Neptune-like Kepler-1992 b · Rocky Terrestrial Kepler-1986 b · Super-Earth

Host System: Kepler-1869

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,808 K — hotter than the Sun (5,778 K)

Estimated Age

1.29 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.902 R☉

Stellar Mass

0.987 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.522 dex

Stellar density

0.653 g/cm³

Metallicity ratio

[Fe/H]

Distance

113.03 parsec

Light-years 368.64 ly

V-band magnitude

10.31 mag

Voyager-speed travel 6,500,928 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

8.819 mas

Total Proper Motion

28.831 mas/yr

PM Right Ascension

-19.44 mas/yr

PM Declination

21.29 mas/yr

Galactic Cartesian (pc)

x = 0.282 · y = -0.678 · z = 0.679

Equatorial (J2000)

RA 292.61500° · Dec 42.76434°

Galactic ℓ, b

75.346° · 11.472°

Ecliptic λ, β

308.750° · 63.193°

HTM-20 index

-45944324