Key parameters at a glance

A radius of 5.40 Earth radii
A mass of 39.40 Earth masses
Surface gravity around 1.35 g
An orbital period of 71.312 days
Semi-major axis 0.3540 AU
Equilibrium temperature 475 K (202 °C)
Distance from Earth 7,218.45 light-years
Earth Similarity Index 0.333
Travel time at Voyager 1 speed 127,297,394 years

1 sibling around Kepler-328

Kepler-328 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-328 b	Sub-Neptune	2.30	28.50	34.921	602	2013
Kepler-328 c this	Neptune-like	5.40	39.40	71.312	475	2013

Kepler-328 c Planet Profile

Physical Specs

Radius

5.40 R⊕

Radius (Jupiter)

0.482 R♃

Mass

39.40 M⊕

Mass (Jupiter)

0.124 M♃

Density

0.60 g/cm³

Surface Gravity

1.35 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.333

HZ Position Inner

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#327of 574

top 56.8%

This planet

5.40R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

K2-24 b 5.40 R⊕ Kepler-1737 b 5.40 R⊕ HD 10180 e 5.39 R⊕

Metric	Earth	Kepler-328 c	Jupiter
Radius (R⊕)	1.00	5.40	11.21
Mass (M⊕)	1.00	39.40	317.83
Density (g/cm³)	5.51	0.60	1.33
Surface Gravity (g)	1.00	1.35	2.53
Insolation (S⊕)	1.00	22.03	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	39.400 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 184164097

Gaia DR2

Gaia DR2 2076373321899335808

Gaia DR3

Gaia DR3 2076373321899335808

System

Kepler-328

Percentile among Neptune-like cohort

Radius 5.400 R⊕ · percentile 43 / cohort 574

Mass 39.400 M⊕ · percentile 63 / cohort 574

Orbital period 71.31 d · percentile 76 / cohort 524

Distance 2,213.19 pc · percentile 90 / cohort 572

ESI 0.333 · percentile 59 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

71.312 days

Semi-major axis

0.3540 AU

Eccentricity

0.000

Inclination

89.97 °

Year Length

A year here lasts approximately 71.31 Earth days (19.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.3540 AU.

Transit Fingerprint

Depth

0.214 %

Duration

8.781 h

Impact parameter b

0.928

Rp / R★

0.042350

Transit midpoint (BJD)

2,454,965.3924

Photometric dip

Transit produces a flux drop of 2,138 ppm lasting ≈ 8.78 h.

Extended Orbital Architecture

Planet / star radius ratio

0.042350

Semi-major axis / stellar radius

64.746

Impact parameter (b)

0.928

Transit mid-time (BJD)

2,454,965.3924

Angular separation (arcsec)

0.16000

Eq. Temperature

475K

(202 °C)

Insolation (S⊕)

22.03

Earth = 1.00

Earth Similarity (ESI)

0.333

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

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

Xie 2014

Instrument

Kepler CCD Array

Publication

2014-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 c · Super-Earth

Host System: Kepler-328

Spectral Class

F-type yellow-white

Effective Temperature

6,064 K — hotter than the Sun (5,778 K)

Estimated Age

2.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.060 R☉

Stellar Mass

1.150 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

0.993 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,213.19 parsec

Light-years 7,218.45 ly

V-band magnitude

15.79 mag

Voyager-speed travel 127,297,394 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.425 mas

Total Proper Motion

5.963 mas/yr

PM Right Ascension

-2.81 mas/yr

PM Declination

-5.26 mas/yr

Galactic Cartesian (pc)

x = 0.333 · y = -0.690 · z = 0.643

Equatorial (J2000)

RA 295.80928° · Dec 40.00849°

Galactic ℓ, b

74.000° · 8.070°

Ecliptic λ, β

311.497° · 59.784°

HTM-20 index

-1224775228