Key parameters at a glance

A radius of 4.32 Earth radii
A mass of 15.60 Earth masses
Surface gravity around 0.84 g
An orbital period of 10.424 days
Semi-major axis 0.1013 AU
Equilibrium temperature 1,012 K (739 °C)
Distance from Earth 1,555.93 light-years
Earth Similarity Index 0.187
Travel time at Voyager 1 speed 27,438,890 years

3 siblings around KOI-94

KOI-94 c 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
KOI-94 b	Super-Earth	1.71	10.50	3.743	1,486	2013
KOI-94 c this	Neptune-like	4.32	15.60	10.424	1,012	2013
KOI-94 d	Gas Giant	11.27	106.00	22.343	806	2013
KOI-94 e	Neptune-like	6.56	35.00	54.320	584	2013

KOI-94 c Planet Profile

Physical Specs

Radius

4.32 R⊕

Radius (Jupiter)

0.385 R♃

Mass

15.60 M⊕

Mass (Jupiter)

0.049 M♃

Density

0.91 g/cm³

Surface Gravity

0.84 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.187

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

#488of 574

top 84.8%

This planet

4.32R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

Kepler-145 c 4.32 R⊕ GJ 687 b 4.32 R⊕ CoRoT-7 d 4.31 R⊕

Metric	Earth	KOI-94 c	Jupiter
Radius (R⊕)	1.00	4.32	11.21
Mass (M⊕)	1.00	15.60	317.83
Density (g/cm³)	5.51	0.91	1.33
Surface Gravity (g)	1.00	0.84	2.53
Insolation (S⊕)	1.00	268.22	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	15.600 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	6.204 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

TIC

TIC 273231214

Gaia DR2

Gaia DR2 2076970047474270208

Gaia DR3

Gaia DR3 2076970047474270208

System

KOI-94

Percentile among Neptune-like cohort

Radius 4.320 R⊕ · percentile 15 / cohort 574

Mass 15.600 M⊕ · percentile 10 / cohort 574

Orbital period 10.42 d · percentile 38 / cohort 524

Distance 477.05 pc · percentile 55 / cohort 572

ESI 0.187 · percentile 25 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

10.424 days

Semi-major axis

0.1013 AU

Eccentricity

0.430

Inclination

88.36 °

Year Length

A year here lasts approximately 10.42 Earth days (2.9% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1013 AU.

Transit Fingerprint

Depth

0.078 %

Duration

5.226 h

Impact parameter b

0.410

Rp / R★

0.025990

Transit midpoint (BJD)

2,454,971.0087

Photometric dip

Transit produces a flux drop of 777 ppm lasting ≈ 5.23 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025990

Semi-major axis / stellar radius

14.300

Impact parameter (b)

0.410

RV semi-amplitude (K)

3.500 m/s

Transit mid-time (BJD)

2,454,971.0087

Angular separation (arcsec)

0.21200

Eq. Temperature

1,012K

(739 °C)

Insolation (S⊕)

268.22

Earth = 1.00

Earth Similarity (ESI)

0.187

0 = alien, 1 = Earth-identical

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

Detection Signatures

Transit photometry

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

Radial velocity

Stellar wobble has been measured spectroscopically.

Transit timing variations

Gravitational interactions from neighbours have been detected.

Discovery Paper

Primary reference

Weiss et al. 2013

Instrument

Kepler CCD Array

Publication

2013-05

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: KOI-94

Spectral Class

F-type yellow-white

Effective Temperature

6,182 K — hotter than the Sun (5,778 K)

Estimated Age

3.16 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.520 R☉

Stellar Mass

1.277 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.181 dex

Stellar density

0.771 g/cm³

Rotational v·sin i

7.30 km/s

Metallicity ratio

[Fe/H]

Distance

477.05 parsec

Light-years 1,555.93 ly

V-band magnitude

12.31 mag

Voyager-speed travel 27,438,890 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.068 mas

Total Proper Motion

2.394 mas/yr

PM Right Ascension

1.97 mas/yr

PM Declination

1.36 mas/yr

Galactic Cartesian (pc)

x = 0.342 · y = -0.661 · z = 0.668

Equatorial (J2000)

RA 297.33307° · Dec 41.89112°

Galactic ℓ, b

76.226° · 7.983°

Ecliptic λ, β

315.053° · 61.124°

HTM-20 index

-847074365