Key parameters at a glance

A radius of 0.98 Earth radii
A mass of 0.90 Earth masses
Surface gravity around 0.94 g
An orbital period of 4.068 days
Semi-major axis 0.0504 AU
Equilibrium temperature 1,170 K (897 °C)
Distance from Earth 1,280.94 light-years
Earth Similarity Index 0.271
Travel time at Voyager 1 speed 22,589,408 years

1 sibling around Kepler-1990

Kepler-1990 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-1990 b	Sub-Neptune	3.27	10.70	1.735	1,554	2023
Kepler-1990 c this	Rocky Terrestrial	0.98	0.90	4.068	1,170	2023

Kepler-1990 c Planet Profile

Physical Specs

Radius

0.98 R⊕

Radius (Jupiter)

0.087 R♃

Mass

0.90 M⊕

Mass (Jupiter)

0.003 M♃

Density

5.28 g/cm³

Surface Gravity

0.94 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.271

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

#355of 570

top 62.1%

This planet

0.98R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1328 b 0.98 R⊕ Kepler-220 d 0.98 R⊕ Kepler-1053 b 0.98 R⊕

Metric	Earth	Kepler-1990 c	Jupiter
Radius (R⊕)	1.00	0.98	11.21
Mass (M⊕)	1.00	0.90	317.83
Density (g/cm³)	5.51	5.28	1.33
Surface Gravity (g)	1.00	0.94	2.53
Insolation (S⊕)	1.00	442.08	0.037

Star Catalogue Identifiers

TIC

TIC 269119490

Gaia DR2

Gaia DR2 2076121602454770560

Gaia DR3

Gaia DR3 2076121602454770560

System

Kepler-1990

Percentile among Rocky Terrestrial cohort

Radius 0.980 R⊕ · percentile 37 / cohort 570

Mass 0.904 M⊕ · percentile 33 / cohort 570

Orbital period 4.07 d · percentile 45 / cohort 567

Distance 392.74 pc · percentile 51 / cohort 566

ESI 0.271 · percentile 30 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

4.068 days

Semi-major axis

0.0504 AU

Eccentricity

0.000

Inclination

86.61 °

Year Length

A year here lasts approximately 4.07 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0504 AU.

Transit Fingerprint

Depth

0.008 %

Duration

2.835 h

Impact parameter b

0.550

Rp / R★

0.008409

Transit midpoint (BJD)

2,454,965.2761

Photometric dip

Transit produces a flux drop of 80 ppm lasting ≈ 2.83 h.

Extended Orbital Architecture

Planet / star radius ratio

0.008409

Semi-major axis / stellar radius

9.300

Impact parameter (b)

0.550

Transit mid-time (BJD)

2,454,965.2761

Angular separation (arcsec)

0.12800

Eq. Temperature

1,170K

(897 °C)

Insolation (S⊕)

442.08

Earth = 1.00

Earth Similarity (ESI)

0.271

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-1990

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,751 K — cooler than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.071 R☉

Stellar Mass

1.028 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.391 dex

Stellar density

0.918 g/cm³

Metallicity ratio

[Fe/H]

Distance

392.74 parsec

Light-years 1,280.94 ly

V-band magnitude

11.95 mag

Voyager-speed travel 22,589,408 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.518 mas

Total Proper Motion

10.845 mas/yr

PM Right Ascension

-3.15 mas/yr

PM Declination

-10.38 mas/yr

Galactic Cartesian (pc)

x = 0.354 · y = -0.620 · z = 0.700

Equatorial (J2000)

RA 299.70474° · Dec 44.43571°

Galactic ℓ, b

79.324° · 7.763°

Ecliptic λ, β

320.605° · 62.753°

HTM-20 index

-1731411218