Key parameters at a glance

A radius of 2.00 Earth radii
A mass of 158.90 Earth masses
Surface gravity around 39.73 g
An orbital period of 8.752 days
Semi-major axis 0.0900 AU
Equilibrium temperature 451 K (178 °C)
Distance from Earth 1,056.25 light-years
Earth Similarity Index 0.281
Travel time at Voyager 1 speed 18,626,905 years
Almost certainly tidally locked to its host star given the close orbit

4 siblings around Kepler-32

Kepler-32 c shares its host star with 4 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-32 f	Rocky Terrestrial	0.82	969.23	0.743	1,026	2012
Kepler-32 e	Super-Earth	1.50	4.08	2.896	652	2012
Kepler-32 b	Sub-Neptune	2.20	1,303.00	5.901	514	2011
Kepler-32 c this	Sub-Neptune	2.00	158.90	8.752	451	2011
Kepler-32 d	Sub-Neptune	2.70	39.91	22.780	328	2012

Kepler-32 c Planet Profile

Physical Specs

Radius

2.00 R⊕

Radius (Jupiter)

0.178 R♃

Mass

158.90 M⊕

Mass (Jupiter)

0.500 M♃

Density

0.33 g/cm³

Surface Gravity

39.73 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.281

HZ Position Inner

Controversial No

Discovery

Year 2011

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1955of 1978

top 98.8%

This planet

2.00R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-238 f 2.00 R⊕ Kepler-242 c 2.00 R⊕ Kepler-179 c 2.00 R⊕

Metric	Earth	Kepler-32 c	Jupiter
Radius (R⊕)	1.00	2.00	11.21
Mass (M⊕)	1.00	158.90	317.83
Density (g/cm³)	5.51	0.33	1.33
Surface Gravity (g)	1.00	39.73	2.53
Insolation (S⊕)	1.00	10.68	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	158.900 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 273590427

Gaia DR2

Gaia DR2 2080287892525359872

Gaia DR3

Gaia DR3 2080287892525359872

System

Kepler-32

Percentile among Sub-Neptune cohort

Radius 2.000 R⊕ · percentile 0 / cohort 1978

Mass 158.900 M⊕ · percentile 99 / cohort 1978

Orbital period 8.75 d · percentile 29 / cohort 1946

Distance 323.85 pc · percentile 37 / cohort 1975

ESI 0.281 · percentile 23 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

8.752 days

Semi-major axis

0.0900 AU

Eccentricity

0.000

Inclination

89.97 °

Year Length

A year here lasts approximately 8.75 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0900 AU.

Transit Fingerprint

Depth

0.145 %

Duration

2.328 h

Impact parameter b

0.017

Rp / R★

0.035200

Transit midpoint (BJD)

2,454,977.3780

Photometric dip

Transit produces a flux drop of 1,453 ppm lasting ≈ 2.33 h.

Extended Orbital Architecture

Planet / star radius ratio

0.035200

Semi-major axis / stellar radius

29.100

Impact parameter (b)

0.017

Transit mid-time (BJD)

2,454,977.3780

Angular separation (arcsec)

0.27800

Eq. Temperature

451K

(178 °C)

Insolation (S⊕)

10.68

Earth = 1.00

Earth Similarity (ESI)

0.281

0 = alien, 1 = Earth-identical

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

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

Fabrycky et al. 2012

Instrument

Kepler CCD Array

Publication

2012-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2011 at Kepler (12 shown).

Kepler-22 b · Sub-Neptune Kepler-20 d · Sub-Neptune Kepler-26 c · Sub-Neptune Kepler-19 c · Sub-Neptune Kepler-26 b · Sub-Neptune Kepler-28 c · Super-Earth Kepler-10 c · Sub-Neptune Kepler-20 f · Rocky Terrestrial Kepler-42 d · Rocky Terrestrial Kepler-16 b · Neptune-like Kepler-28 b · Super-Earth Kepler-34 b · Neptune-like

Host System: Kepler-32

Spectral Class

M-type red dwarf

Effective Temperature

3,900 K — cooler than the Sun (5,778 K)

Estimated Age

5.60 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.530 R☉

Stellar Mass

0.580 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.640 dex

Stellar density

4.215 g/cm³

Systemic radial velocity

-32.50 km/s

Metallicity ratio

[Fe/H]

Distance

323.85 parsec

Light-years 1,056.25 ly

V-band magnitude

16.36 mag

Voyager-speed travel 18,626,905 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.059 mas

Total Proper Motion

23.904 mas/yr

PM Right Ascension

-13.62 mas/yr

PM Declination

19.65 mas/yr

Galactic Cartesian (pc)

x = 0.321 · y = -0.608 · z = 0.726

Equatorial (J2000)

RA 297.84231° · Dec 46.57436°

Galactic ℓ, b

80.539° · 9.962°

Ecliptic λ, β

320.060° · 65.247°

HTM-20 index

1078132826