Key parameters at a glance

A radius of 12.00 Earth radii
A mass of 6,992.26 Earth masses
Surface gravity around 48.56 g
An orbital period of 2,500.000 days
Semi-major axis 4.2000 AU
Distance from Earth 1,302.66 light-years
Earth Similarity Index 0.279
Travel time at Voyager 1 speed 22,972,417 years

1 sibling around KOI-12

Kepler-448 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
KOI-12 b	Gas Giant	13.79	349.61	17.855	911	2015
Kepler-448 c this	Gas Giant	12.00	6,992.26	2,500.000	—	2017

Kepler-448 c Planet Profile

Physical Specs

Radius

12.00 R⊕

Radius (Jupiter)

1.070 R♃

Mass

6,992.26 M⊕

Mass (Jupiter)

22.000 M♃

Density

22.20 g/cm³

Surface Gravity

48.56 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.279

HZ Position Unknown

Controversial No

Discovery

Year 2017

Method Transit Timing Variations

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1494of 1771

top 84.3%

This planet

12.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 80913 b 12.00 R⊕ HIP 78530 b 12.00 R⊕ HD 221420 b 12.00 R⊕

Metric	Earth	Kepler-448 c	Jupiter
Radius (R⊕)	1.00	12.00	11.21
Mass (M⊕)	1.00	6,992.26	317.83
Density (g/cm³)	5.51	22.20	1.33
Surface Gravity (g)	1.00	48.56	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	6,992.260 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 169461816

Gaia DR2

Gaia DR2 2073860662955260416

Gaia DR3

Gaia DR3 2073860662955260416

System

KOI-12

Percentile among Gas Giant cohort

Radius 12.000 R⊕ · percentile 15 / cohort 1771

Mass 6,992.260 M⊕ · percentile 98 / cohort 1747

Orbital period 2,500.00 d · percentile 87 / cohort 1533

Distance 399.40 pc · percentile 70 / cohort 1759

ESI 0.279 · percentile 52 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,500.000 days

Semi-major axis

4.2000 AU

Eccentricity

0.650

Inclination

— °

Year Length

A year here lasts about 6.84 Earth years on a highly eccentric trajectory at a mean orbital distance of 4.2000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.279

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Masuda 2017

Instrument

Kepler CCD Array

Publication

2017-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2017 at Kepler (8 shown).

Kepler-1649 b · Rocky Terrestrial Kepler-1652 b · Super-Earth Kepler-1653 b · Sub-Neptune Kepler-1651 b · Super-Earth Kepler-150 f · Sub-Neptune Kepler-1650 b · Rocky Terrestrial Kepler-90 i · Super-Earth Kepler-80 g · Rocky Terrestrial

Host System: KOI-12

Spectral Class

F-type yellow-white

Effective Temperature

6,635 K — hotter than the Sun (5,778 K)

Estimated Age

1.45 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.400 R☉

Stellar Mass

1.500 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.308 dex

Stellar density

0.800 g/cm³

Systemic radial velocity

-14.68 km/s

Rotational v·sin i

60.00 km/s

Metallicity ratio

[M/H]

Distance

399.40 parsec

Light-years 1,302.66 ly

V-band magnitude

11.51 mag

Voyager-speed travel 22,972,417 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.475 mas

Total Proper Motion

3.999 mas/yr

PM Right Ascension

3.04 mas/yr

PM Declination

2.60 mas/yr

Galactic Cartesian (pc)

x = 0.348 · y = -0.670 · z = 0.656

Equatorial (J2000)

RA 297.45374° · Dec 41.01102°

Galactic ℓ, b

75.499° · 7.470°

Ecliptic λ, β

314.552° · 60.274°

HTM-20 index

-946880236