Key parameters at a glance

A radius of 2.70 Earth radii
A mass of 39.91 Earth masses
Surface gravity around 5.47 g
An orbital period of 22.780 days
Semi-major axis 0.1300 AU
Equilibrium temperature 328 K (55 °C)
Distance from Earth 1,056.25 light-years
Earth Similarity Index 0.447
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 d 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	Sub-Neptune	2.00	158.90	8.752	451	2011
Kepler-32 d this	Sub-Neptune	2.70	39.91	22.780	328	2012

Kepler-32 d Planet Profile

Physical Specs

Radius

2.70 R⊕

Radius (Jupiter)

0.241 R♃

Mass

39.91 M⊕

Mass (Jupiter)

0.126 M♃

Density

0.52 g/cm³

Surface Gravity

5.47 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.447

HZ Position Inner

Controversial No

Discovery

Year 2012

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#865of 1978

top 43.7%

This planet

2.70R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-668 b 2.70 R⊕ Kepler-1452 b 2.70 R⊕ Kepler-259 c 2.70 R⊕

Metric	Earth	Kepler-32 d	Jupiter
Radius (R⊕)	1.00	2.70	11.21
Mass (M⊕)	1.00	39.91	317.83
Density (g/cm³)	5.51	0.52	1.33
Surface Gravity (g)	1.00	5.47	2.53
Insolation (S⊕)	1.00	3.63	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	39.909 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 2.700 R⊕ · percentile 56 / cohort 1978

Mass 39.909 M⊕ · percentile 97 / cohort 1978

Orbital period 22.78 d · percentile 66 / cohort 1946

Distance 323.85 pc · percentile 37 / cohort 1975

ESI 0.447 · percentile 62 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

22.780 days

Semi-major axis

0.1300 AU

Eccentricity

0.000

Inclination

89.99 °

Year Length

A year here lasts approximately 22.78 Earth days (6.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1300 AU.

Transit Fingerprint

Depth

0.218 %

Duration

2.976 h

Impact parameter b

0.008

Rp / R★

0.046700

Transit midpoint (BJD)

2,454,988.2110

Photometric dip

Transit produces a flux drop of 2,181 ppm lasting ≈ 2.98 h.

Extended Orbital Architecture

Planet / star radius ratio

0.046700

Semi-major axis / stellar radius

55.780

Impact parameter (b)

0.008

Transit mid-time (BJD)

2,454,988.2110

Angular separation (arcsec)

0.40100

Eq. Temperature

328K

(55 °C)

Insolation (S⊕)

3.63

Earth = 1.00

Earth Similarity (ESI)

0.447

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — liquid water is physically possible with adequate atmospheric pressure. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Swift et al. 2013

Instrument

Kepler CCD Array

Publication

2013-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2012 at Kepler (12 shown).

Kepler-54 c · Rocky Terrestrial Kepler-49 c · Sub-Neptune Kepler-55 b · Sub-Neptune Kepler-49 b · Sub-Neptune Kepler-81 c · Sub-Neptune Kepler-55 c · Sub-Neptune Kepler-52 c · Super-Earth Kepler-83 c · Sub-Neptune Kepler-83 b · Sub-Neptune Kepler-54 b · Sub-Neptune Kepler-80 c · Sub-Neptune Kepler-81 b · Sub-Neptune

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