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 0.764 days
Semi-major axis 0.0154 AU
Equilibrium temperature 1,589 K (1316 °C)
Distance from Earth 2,265.57 light-years
Earth Similarity Index 0.184
Travel time at Voyager 1 speed 39,953,283 years
Almost certainly tidally locked to its host star given the close orbit

2 siblings around Kepler-290

Kepler-290 d shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-290 d this	Rocky Terrestrial	0.86	0.57	0.764	1,589	2023
Kepler-290 b	Sub-Neptune	2.25	5.69	14.589	594	2014
Kepler-290 c	Sub-Neptune	2.70	7.75	36.770	437	2014

Kepler-290 d 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 0.184

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

#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-290 d	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	1,503.79	0.037

Star Catalogue Identifiers

TIC

TIC 158218214

Gaia DR2

Gaia DR2 2105538623730974848

Gaia DR3

Gaia DR3 2105538623730974848

System

Kepler-290

Percentile among Rocky Terrestrial cohort

Radius 0.860 R⊕ · percentile 21 / cohort 570

Mass 0.566 M⊕ · percentile 17 / cohort 570

Orbital period 0.76 d · percentile 7 / cohort 567

Distance 694.63 pc · percentile 80 / cohort 566

ESI 0.184 · percentile 11 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.764 days

Semi-major axis

0.0154 AU

Eccentricity

0.000

Inclination

84.79 °

Year Length

A year here lasts roughly 18.3 hours long on a nearly circular orbit at a mean orbital distance of 0.0154 AU.

Transit Fingerprint

Depth

0.013 %

Duration

1.103 h

Impact parameter b

0.442

Rp / R★

0.010487

Transit midpoint (BJD)

2,454,965.2214

Photometric dip

Transit produces a flux drop of 128 ppm lasting ≈ 1.10 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010487

Semi-major axis / stellar radius

4.860

Impact parameter (b)

0.442

Transit mid-time (BJD)

2,454,965.2214

Angular separation (arcsec)

0.02220

Eq. Temperature

1,589K

(1316 °C)

Insolation (S⊕)

1,503.79

Earth = 1.00

Earth Similarity (ESI)

0.184

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

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-290

Spectral Class

K-type orange

Effective Temperature

5,142 K — cooler than the Sun (5,778 K)

Estimated Age

1.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.755 R☉

Stellar Mass

0.840 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.602 dex

Stellar density

3.721 g/cm³

Metallicity ratio

[Fe/H]

Distance

694.63 parsec

Light-years 2,265.57 ly

V-band magnitude

15.78 mag

Voyager-speed travel 39,953,283 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.411 mas

Total Proper Motion

7.358 mas/yr

PM Right Ascension

5.16 mas/yr

PM Declination

-5.25 mas/yr

Galactic Cartesian (pc)

x = 0.208 · y = -0.705 · z = 0.678

Equatorial (J2000)

RA 286.41003° · Dec 42.68151°

Galactic ℓ, b

73.316° · 15.581°

Ecliptic λ, β

298.824° · 64.487°

HTM-20 index

1302520474