Key parameters at a glance

A radius of 3.03 Earth radii
A mass of 5.33 Earth masses
Surface gravity around 0.58 g
An orbital period of 66.028 days
Semi-major axis 0.3300 AU
Distance from Earth 2,297.57 light-years
Earth Similarity Index 0.577
Travel time at Voyager 1 speed 40,517,588 years

Context from the literature

Kepler-289 (PH3) is a rotating variable star slightly more massive than the Sun, with a spectral type of G2, 2370 light-years away from Earth in the constellation of Cygnus. It hosts a system of multiple exoplanets.

Excerpted from Wikipedia · full article

3 siblings around Kepler-289

Kepler-289 d shares its host star with 3 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-289 b	Sub-Neptune	2.49	3.70	34.538	607	2014
Kepler-289 d this	Sub-Neptune	3.03	5.33	66.028	—	2014
Kepler-289 c	Gas Giant	11.23	157.18	125.872	394	2014
Kepler-289 e	Sub-Neptune	2.94	17.40	330.072	286	2025

Kepler-289 d Planet Profile

Physical Specs

Radius

3.03 R⊕

Radius (Jupiter)

0.270 R♃

Mass

5.33 M⊕

Mass (Jupiter)

0.017 M♃

Density

1.14 g/cm³

Surface Gravity

0.58 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.577

HZ Position Unknown

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#491of 1978

top 24.8%

This planet

3.03R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-498 b 3.03 R⊕ Kepler-245 d 3.03 R⊕ Kepler-162 c 3.03 R⊕

Metric	Earth	Kepler-289 d	Jupiter
Radius (R⊕)	1.00	3.03	11.21
Mass (M⊕)	1.00	5.33	317.83
Density (g/cm³)	5.51	1.14	1.33
Surface Gravity (g)	1.00	0.58	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5.330 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 273234825

Gaia DR2

Gaia DR2 2078515170549178880

Gaia DR3

Gaia DR3 2078515170549178880

System

Kepler-289

Percentile among Sub-Neptune cohort

Radius 3.030 R⊕ · percentile 75 / cohort 1978

Mass 5.330 M⊕ · percentile 13 / cohort 1978

Orbital period 66.03 d · percentile 90 / cohort 1946

Distance 704.44 pc · percentile 60 / cohort 1975

ESI 0.577 · percentile 80 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

66.028 days

Semi-major axis

0.3300 AU

Eccentricity

—

Inclination

89.31 °

Year Length

A year here lasts approximately 66.03 Earth days (18.1% of a terrestrial year) at a mean orbital distance of 0.3300 AU.

Transit Fingerprint

Duration

3.557 h

Impact parameter b

0.050

Rp / R★

0.027000

Transit midpoint (BJD)

2,454,975.6240

Extended Orbital Architecture

Planet / star radius ratio

0.027000

Semi-major axis / stellar radius

70.520

Impact parameter (b)

0.050

Transit mid-time (BJD)

2,454,975.6240

Angular separation (arcsec)

0.46800

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.577

0 = alien, 1 = Earth-identical

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Schmitt et al. 2014

Instrument

Kepler CCD Array

Publication

2014-11

Observation locale

Space

Discovery cohort

Planets confirmed in 2014 at Kepler (12 shown).

Kepler-186 e · Super-Earth Kepler-395 c · Super-Earth Kepler-220 e · Super-Earth Kepler-249 d · Super-Earth Kepler-296 f · Super-Earth Kepler-367 c · Rocky Terrestrial Kepler-296 e · Super-Earth Kepler-155 c · Sub-Neptune Kepler-138 d · Super-Earth Kepler-333 c · Rocky Terrestrial Kepler-331 d · Super-Earth Kepler-267 d · Sub-Neptune

Host System: Kepler-289

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,990 K — hotter than the Sun (5,778 K)

Estimated Age

0.65 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.000 R☉

Stellar Mass

1.080 M☉

Metallicity [Fe/H]

0.05

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.580 g/cm³

Metallicity ratio

[Fe/H]

Distance

704.44 parsec

Light-years 2,297.57 ly

V-band magnitude

14.14 mag

Voyager-speed travel 40,517,588 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.391 mas

Total Proper Motion

4.785 mas/yr

PM Right Ascension

4.78 mas/yr

PM Declination

-0.24 mas/yr

Galactic Cartesian (pc)

x = 0.338 · y = -0.650 · z = 0.681

Equatorial (J2000)

RA 297.46534° · Dec 42.88285°

Galactic ℓ, b

77.147° · 8.386°

Ecliptic λ, β

316.043° · 62.002°

HTM-20 index

1432308909

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