Key parameters at a glance

A radius of 2.60 Earth radii
A mass of 1.33 Earth masses
Surface gravity around 0.20 g
An orbital period of 12.760 days
Semi-major axis 0.1020 AU
Equilibrium temperature 633 K (360 °C)
Distance from Earth 1,719.89 light-years
Earth Similarity Index 0.285
Travel time at Voyager 1 speed 30,330,242 years

3 siblings around Kepler-176

Kepler-176 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
Kepler-176 b	Super-Earth	1.43	290.54	5.433	841	2014
Kepler-176 c this	Sub-Neptune	2.60	1.33	12.760	633	2014
Kepler-176 d	Sub-Neptune	2.51	1.72	25.752	501	2014
Kepler-176 e	Super-Earth	1.45	0.52	51.166	398	2016

Kepler-176 c Planet Profile

Physical Specs

Radius

2.60 R⊕

Radius (Jupiter)

0.232 R♃

Mass

1.33 M⊕

Mass (Jupiter)

0.004 M♃

Density

0.49 g/cm³

Surface Gravity

0.20 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.285

HZ Position Inner

Controversial No

Discovery

Year 2014

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1017of 1978

top 51.4%

This planet

2.60R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

K2-155 c 2.60 R⊕ Kepler-84 e 2.60 R⊕ Kepler-115 c 2.60 R⊕

Metric	Earth	Kepler-176 c	Jupiter
Radius (R⊕)	1.00	2.60	11.21
Mass (M⊕)	1.00	1.33	317.83
Density (g/cm³)	5.51	0.49	1.33
Surface Gravity (g)	1.00	0.20	2.53
Insolation (S⊕)	1.00	39.63	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1.330 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 271159950

Gaia DR2

Gaia DR2 2078286197246582016

Gaia DR3

Gaia DR3 2078286197246582016

System

Kepler-176

Percentile among Sub-Neptune cohort

Radius 2.600 R⊕ · percentile 48 / cohort 1978

Mass 1.330 M⊕ · percentile 0 / cohort 1978

Orbital period 12.76 d · percentile 43 / cohort 1946

Distance 527.32 pc · percentile 49 / cohort 1975

ESI 0.285 · percentile 24 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

12.760 days

Semi-major axis

0.1020 AU

Eccentricity

0.000

Inclination

88.25 °

Year Length

A year here lasts approximately 12.76 Earth days (3.5% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1020 AU.

Transit Fingerprint

Depth

0.088 %

Duration

3.541 h

Impact parameter b

0.470

Rp / R★

0.027597

Transit midpoint (BJD)

2,455,003.3106

Photometric dip

Transit produces a flux drop of 882 ppm lasting ≈ 3.54 h.

Extended Orbital Architecture

Planet / star radius ratio

0.027597

Semi-major axis / stellar radius

27.650

Impact parameter (b)

0.470

Transit mid-time (BJD)

2,455,003.3106

Angular separation (arcsec)

0.19300

Eq. Temperature

633K

(360 °C)

Insolation (S⊕)

39.63

Earth = 1.00

Earth Similarity (ESI)

0.285

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

Rowe et al. 2014

Instrument

Kepler CCD Array

Publication

2014-03

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-176

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,232 K — cooler than the Sun (5,778 K)

Estimated Age

2.45 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.891 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.474 dex

Stellar density

1.740 g/cm³

Metallicity ratio

[Fe/H]

Distance

527.32 parsec

Light-years 1,719.89 ly

V-band magnitude

14.77 mag

Voyager-speed travel 30,330,242 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.868 mas

Total Proper Motion

19.900 mas/yr

PM Right Ascension

-15.03 mas/yr

PM Declination

-13.04 mas/yr

Galactic Cartesian (pc)

x = 0.301 · y = -0.655 · z = 0.693

Equatorial (J2000)

RA 294.66790° · Dec 43.85321°

Galactic ℓ, b

77.026° · 10.636°

Ecliptic λ, β

312.740° · 63.677°

HTM-20 index

-1280058698