Key parameters at a glance

A radius of 2.62 Earth radii
A mass of 12.50 Earth masses
Surface gravity around 1.82 g
An orbital period of 15.413 days
Semi-major axis 0.1335 AU
Equilibrium temperature 944 K (671 °C)
Distance from Earth 1,487.21 light-years
Earth Similarity Index 0.274
Travel time at Voyager 1 speed 26,226,994 years

2 siblings around Kepler-450

Kepler-450 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
Kepler-450 d	Rocky Terrestrial	0.84	17.60	7.515	1,199	2015
Kepler-450 c this	Sub-Neptune	2.62	12.50	15.413	944	2015
Kepler-450 b	Neptune-like	6.14	19.40	28.455	769	2015

Kepler-450 c Planet Profile

Physical Specs

Radius

2.62 R⊕

Radius (Jupiter)

0.234 R♃

Mass

12.50 M⊕

Mass (Jupiter)

0.039 M♃

Density

8.80 g/cm³

Surface Gravity

1.82 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.274

HZ Position Inner

Controversial No

Discovery

Year 2015

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#989of 1978

top 49.9%

This planet

2.62R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-977 b 2.62 R⊕ K2-337 b 2.62 R⊕ TOI-815 c 2.62 R⊕

Metric	Earth	Kepler-450 c	Jupiter
Radius (R⊕)	1.00	2.62	11.21
Mass (M⊕)	1.00	12.50	317.83
Density (g/cm³)	5.51	8.80	1.33
Surface Gravity (g)	1.00	1.82	2.53
Insolation (S⊕)	1.00	213.73	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	12.500 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 27534138

Gaia DR2

Gaia DR2 2135590578620605568

Gaia DR3

Gaia DR3 2135590578620605568

System

Kepler-450

Percentile among Sub-Neptune cohort

Radius 2.620 R⊕ · percentile 50 / cohort 1978

Mass 12.500 M⊕ · percentile 85 / cohort 1978

Orbital period 15.41 d · percentile 51 / cohort 1946

Distance 455.98 pc · percentile 45 / cohort 1975

ESI 0.274 · percentile 22 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

15.413 days

Semi-major axis

0.1335 AU

Eccentricity

0.020

Inclination

88.73 °

Year Length

A year here lasts approximately 15.41 Earth days (4.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1335 AU.

Transit Fingerprint

Depth

0.025 %

Duration

6.610 h

Impact parameter b

0.315

Rp / R★

0.014501

Transit midpoint (BJD)

2,454,969.9407

Photometric dip

Transit produces a flux drop of 247 ppm lasting ≈ 6.61 h.

Extended Orbital Architecture

Planet / star radius ratio

0.014501

Semi-major axis / stellar radius

17.531

Impact parameter (b)

0.315

Transit mid-time (BJD)

2,454,969.9407

Angular separation (arcsec)

0.29300

Eq. Temperature

944K

(671 °C)

Insolation (S⊕)

213.73

Earth = 1.00

Earth Similarity (ESI)

0.274

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

Van Eylen Albrecht 2015

Instrument

Kepler CCD Array

Publication

2015-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2015 at Kepler (12 shown).

Kepler-438 b · Rocky Terrestrial Kepler-445 d · Super-Earth Kepler-442 b · Super-Earth Kepler-439 b · Sub-Neptune Kepler-437 b · Sub-Neptune Kepler-440 b · Super-Earth KIC 8540376 c · Sub-Neptune Kepler-445 b · Super-Earth Kepler-446 d · Super-Earth Kepler-436 b · Sub-Neptune Kepler-445 c · Sub-Neptune Kepler-443 b · Sub-Neptune

Host System: Kepler-450

Spectral Class

F-type yellow-white

Effective Temperature

6,197 K — hotter than the Sun (5,778 K)

Estimated Age

2.57 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.642 R☉

Stellar Mass

1.190 M☉

Metallicity [Fe/H]

0.13

Extended Stellar Properties

Surface gravity (log g)

4.083 dex

Stellar density

0.379 g/cm³

Systemic radial velocity

-16.41 km/s

Metallicity ratio

[M/H]

Distance

455.98 parsec

Light-years 1,487.21 ly

V-band magnitude

11.99 mag

Voyager-speed travel 26,226,994 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.164 mas

Total Proper Motion

7.854 mas/yr

PM Right Ascension

4.17 mas/yr

PM Declination

6.65 mas/yr

Galactic Cartesian (pc)

x = 0.271 · y = -0.568 · z = 0.777

Equatorial (J2000)

RA 295.48658° · Dec 51.01352°

Galactic ℓ, b

83.797° · 13.417°

Ecliptic λ, β

321.950° · 69.894°

HTM-20 index

-262721394