Key parameters at a glance

A radius of 0.61 Earth radii
A mass of 8.00 Earth masses
Surface gravity around 21.50 g
An orbital period of 0.177 days
Semi-major axis 0.0050 AU
Equilibrium temperature 1,654 K (1381 °C)
Distance from Earth 438.06 light-years
Earth Similarity Index 0.081
Travel time at Voyager 1 speed 7,725,247 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around Kepler-974

KOI-1843.03 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-1843.03 this	Rocky Terrestrial	0.61	8.00	0.177	1,654	2013
Kepler-974 b	Super-Earth	1.57	3.09	4.194	577	2016

KOI-1843.03 Planet Profile

Physical Specs

Radius

0.61 R⊕

Radius (Jupiter)

0.054 R♃

Mass

8.00 M⊕

Mass (Jupiter)

0.025 M♃

Density

— g/cm³

Surface Gravity

21.50 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.081

HZ Position Unknown

Controversial No

Discovery

Year 2013

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#548of 570

top 96.0%

This planet

0.61R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1087 b 0.61 R⊕ K2-89 b 0.62 R⊕ Kepler-1998 b 0.60 R⊕

Metric	Earth	KOI-1843.03	Jupiter
Radius (R⊕)	1.00	0.61	11.21
Mass (M⊕)	1.00	8.00	317.83
Density (g/cm³)	5.51	—	1.33
Surface Gravity (g)	1.00	21.50	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	8.000 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 120418600

Gaia DR2

Gaia DR2 2103377980301947264

Gaia DR3

Gaia DR3 2103377980301947264

System

Kepler-974

Percentile among Rocky Terrestrial cohort

Radius 0.610 R⊕ · percentile 4 / cohort 570

Mass 8.000 M⊕ · percentile 97 / cohort 570

Orbital period 0.18 d · percentile 0 / cohort 567

Distance 134.31 pc · percentile 26 / cohort 566

ESI 0.081 · percentile 1 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.177 days

Semi-major axis

0.0050 AU

Eccentricity

—

Inclination

72.00 °

Year Length

A year here lasts roughly 4.2 hours long at a mean orbital distance of 0.0050 AU.

Transit Fingerprint

Depth

0.015 %

Duration

0.650 h

Rp / R★

0.011160

Transit midpoint (BJD)

2,454,964.5523

Photometric dip

Transit produces a flux drop of 150 ppm lasting ≈ 0.65 h.

Extended Orbital Architecture

Planet / star radius ratio

0.011160

Semi-major axis / stellar radius

1.900

Occultation depth

0.002 ppm

Transit mid-time (BJD)

2,454,964.5523

Angular separation (arcsec)

0.03720

Eq. Temperature

1,654K

(1381 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.081

0 = alien, 1 = Earth-identical

Insufficient insolation data — the dayside is scorched. Close-orbiting tidally-locked around a cool host.

Discovery Paper

Primary reference

Rappaport et al. 2013

Instrument

Kepler CCD Array

Publication

2013-08

Observation locale

Space

Discovery cohort

Planets confirmed in 2013 at Kepler (12 shown).

Kepler-69 c · Super-Earth Kepler-61 b · Sub-Neptune Kepler-62 e · Super-Earth KOI-351 f · Sub-Neptune Kepler-62 f · Super-Earth KOI-351 e · Sub-Neptune Kepler-1704 b · Gas Giant Kepler-37 d · Sub-Neptune Kepler-282 e · Sub-Neptune KOI-351 h · Gas Giant KOI-351 d · Sub-Neptune Kepler-114 c · Super-Earth

Host System: Kepler-974

Spectral Class

M-type red dwarf

Effective Temperature

3,584 K — cooler than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.450 R☉

Stellar Mass

0.460 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.800 dex

Stellar density

4.000 g/cm³

Rotation period

34.50 days

Metallicity ratio

[Fe/H]

Distance

134.31 parsec

Light-years 438.06 ly

V-band magnitude

15.30 mag

Voyager-speed travel 7,725,247 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

7.417 mas

Total Proper Motion

41.192 mas/yr

PM Right Ascension

0.69 mas/yr

PM Declination

41.19 mas/yr

Galactic Cartesian (pc)

x = 0.198 · y = -0.737 · z = 0.646

Equatorial (J2000)

RA 285.01311° · Dec 40.22095°

Galactic ℓ, b

70.540° · 15.599°

Ecliptic λ, β

295.225° · 62.352°

HTM-20 index

-434478442