Key parameters at a glance

A radius of 0.80 Earth radii
A mass of 2.02 Earth masses
Surface gravity around 3.14 g
An orbital period of 7.544 days
Semi-major axis 0.0801 AU
Equilibrium temperature 1,084 K (811 °C)
Distance from Earth 937.17 light-years
Earth Similarity Index 0.219
Travel time at Voyager 1 speed 16,527,052 years

1 sibling around Kepler-1972

Kepler-1972 b 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
Kepler-1972 b this	Rocky Terrestrial	0.80	2.02	7.544	1,084	2022
Kepler-1972 c	Rocky Terrestrial	0.87	2.11	11.330	1,215	2022

Kepler-1972 b Planet Profile

Physical Specs

Radius

0.80 R⊕

Radius (Jupiter)

0.072 R♃

Mass

2.02 M⊕

Mass (Jupiter)

0.006 M♃

Density

22.20 g/cm³

Surface Gravity

3.14 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.219

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#478of 570

top 83.7%

This planet

0.80R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-1076 b 0.80 R⊕ Kepler-1130 b 0.80 R⊕ Kepler-1581 b 0.80 R⊕

Metric	Earth	Kepler-1972 b	Jupiter
Radius (R⊕)	1.00	0.80	11.21
Mass (M⊕)	1.00	2.02	317.83
Density (g/cm³)	5.51	22.20	1.33
Surface Gravity (g)	1.00	3.14	2.53
Insolation (S⊕)	1.00	341.30	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	2.020 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

TIC

TIC 121604440

Gaia DR2

Gaia DR2 2099783127036908416

Gaia DR3

Gaia DR3 2099783127036908416

System

Kepler-1972

Percentile among Rocky Terrestrial cohort

Radius 0.802 R⊕ · percentile 16 / cohort 570

Mass 2.020 M⊕ · percentile 86 / cohort 570

Orbital period 7.54 d · percentile 70 / cohort 567

Distance 287.34 pc · percentile 39 / cohort 566

ESI 0.219 · percentile 17 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

7.544 days

Semi-major axis

0.0801 AU

Eccentricity

0.067

Inclination

87.62 °

Year Length

A year here lasts approximately 7.54 Earth days (2.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0801 AU.

Transit Fingerprint

Depth

0.002 %

Duration

6.926 h

Impact parameter b

0.510

Rp / R★

0.005320

Transit midpoint (BJD)

2,454,944.8999

Photometric dip

Transit produces a flux drop of 17 ppm lasting ≈ 6.93 h.

Extended Orbital Architecture

Planet / star radius ratio

0.005320

Semi-major axis / stellar radius

12.340

Impact parameter (b)

0.510

Transit mid-time (BJD)

2,454,944.8999

Long. of periastron (ω)

64.90°

Angular separation (arcsec)

0.27900

Eq. Temperature

1,084K

(811 °C)

Insolation (S⊕)

341.30

Earth = 1.00

Earth Similarity (ESI)

0.219

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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

Leleu et al. 2022

Instrument

Kepler CCD Array

Publication

2022-01

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Kepler (6 shown).

KOI-7913 b · Sub-Neptune KOI-7368 b · Sub-Neptune KOI-984 c · Gas Giant Kepler-1972 c · Rocky Terrestrial KOI-984 b · Neptune-like KOI-4777.01 · Rocky Terrestrial

Host System: Kepler-1972

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,818 K — hotter than the Sun (5,778 K)

Estimated Age

7.40 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.384 R☉

Stellar Mass

1.120 M☉

Metallicity [Fe/H]

0.23

Extended Stellar Properties

Surface gravity (log g)

4.200 dex

Stellar density

0.626 g/cm³

Metallicity ratio

[M/H]

Distance

287.34 parsec

Light-years 937.17 ly

V-band magnitude

11.23 mag

Voyager-speed travel 16,527,052 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

3.452 mas

Total Proper Motion

28.797 mas/yr

PM Right Ascension

3.41 mas/yr

PM Declination

-28.59 mas/yr

Galactic Cartesian (pc)

x = 0.242 · y = -0.728 · z = 0.641

Equatorial (J2000)

RA 288.39531° · Dec 39.87251°

Galactic ℓ, b

71.279° · 13.087°

Ecliptic λ, β

300.375° · 61.386°

HTM-20 index

-119018698