Key parameters at a glance

A radius of 2.28 Earth radii
A mass of 5.82 Earth masses
Surface gravity around 1.12 g
An orbital period of 26.758 days
Semi-major axis 0.1815 AU
Equilibrium temperature 660 K (387 °C)
Distance from Earth 4,899.97 light-years
Earth Similarity Index 0.397
Travel time at Voyager 1 speed 86,411,002 years

Kepler-1997 b Planet Profile

Physical Specs

Radius

2.28 R⊕

Radius (Jupiter)

0.203 R♃

Mass

5.82 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.70 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.397

HZ Position Inner

Controversial No

Discovery

Year 2023

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1536of 1978

top 77.6%

This planet

2.28R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

GJ 806 c 2.28 R⊕ Kepler-1020 b 2.28 R⊕ DMPP-6 b 2.28 R⊕

Metric	Earth	Kepler-1997 b	Jupiter
Radius (R⊕)	1.00	2.28	11.21
Mass (M⊕)	1.00	5.82	317.83
Density (g/cm³)	5.51	2.70	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	44.86	0.037

Star Catalogue Identifiers

TIC

TIC 273372570

Gaia DR2

Gaia DR2 2080296757338392576

Gaia DR3

Gaia DR3 2080296757338392576

System

Kepler-1997

Percentile among Sub-Neptune cohort

Radius 2.280 R⊕ · percentile 22 / cohort 1978

Mass 5.820 M⊕ · percentile 22 / cohort 1978

Orbital period 26.76 d · percentile 71 / cohort 1946

Distance 1,502.34 pc · percentile 93 / cohort 1975

ESI 0.397 · percentile 51 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

26.758 days

Semi-major axis

0.1815 AU

Eccentricity

0.000

Inclination

89.29 °

Year Length

A year here lasts approximately 26.76 Earth days (7.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1815 AU.

Transit Fingerprint

Depth

0.046 %

Duration

5.858 h

Impact parameter b

0.407

Rp / R★

0.019880

Transit midpoint (BJD)

2,454,970.2872

Photometric dip

Transit produces a flux drop of 455 ppm lasting ≈ 5.86 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019880

Semi-major axis / stellar radius

32.600

Impact parameter (b)

0.407

Transit mid-time (BJD)

2,454,970.2872

Angular separation (arcsec)

0.12100

Eq. Temperature

660K

(387 °C)

Insolation (S⊕)

44.86

Earth = 1.00

Earth Similarity (ESI)

0.397

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Valizadegan et al. 2023

Instrument

Kepler CCD Array

Publication

2023-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2023 at Kepler (12 shown).

Kepler-1126 c · Super-Earth Kepler-2000 c · Super-Earth Kepler-1052 c · Sub-Neptune Kepler-311 d · Sub-Neptune Kepler-1996 c · Sub-Neptune Kepler-1162 c · Super-Earth Kepler-1996 b · Sub-Neptune Kepler-1610 c · Sub-Neptune Kepler-1801 c · Sub-Neptune Kepler-1995 b · Neptune-like Kepler-1992 b · Rocky Terrestrial Kepler-1986 b · Super-Earth

Host System: Kepler-1997

Spectral Class

F-type yellow-white

Effective Temperature

6,215 K — hotter than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.052 R☉

Stellar Mass

1.111 M☉

Metallicity [Fe/H]

-0.06

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

0.919 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,502.34 parsec

Light-years 4,899.97 ly

V-band magnitude

15.45 mag

Voyager-speed travel 86,411,002 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.638 mas

Total Proper Motion

8.521 mas/yr

PM Right Ascension

-2.52 mas/yr

PM Declination

-8.14 mas/yr

Galactic Cartesian (pc)

x = 0.317 · y = -0.610 · z = 0.726

Equatorial (J2000)

RA 297.48083° · Dec 46.58914°

Galactic ℓ, b

80.430° · 10.187°

Ecliptic λ, β

319.542° · 65.370°

HTM-20 index

1130257388