Key parameters at a glance

A radius of 2.27 Earth radii
A mass of 5.77 Earth masses
Surface gravity around 1.12 g
An orbital period of 3.421 days
Semi-major axis 0.0426 AU
Equilibrium temperature 1,129 K (856 °C)
Earth Similarity Index 0.227

Kepler-1985 b Planet Profile

Physical Specs

Radius

2.27 R⊕

Radius (Jupiter)

0.203 R♃

Mass

5.77 M⊕

Mass (Jupiter)

0.018 M♃

Density

2.71 g/cm³

Surface Gravity

1.12 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.227

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

#1554of 1978

top 78.5%

This planet

2.27R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-121 c 2.27 R⊕ Kepler-267 d 2.27 R⊕ Kepler-306 e 2.27 R⊕

Metric	Earth	Kepler-1985 b	Jupiter
Radius (R⊕)	1.00	2.27	11.21
Mass (M⊕)	1.00	5.77	317.83
Density (g/cm³)	5.51	2.71	1.33
Surface Gravity (g)	1.00	1.12	2.53
Insolation (S⊕)	1.00	382.68	0.037

Star Catalogue Identifiers

TIC

TIC 270609465

Gaia DR2

Gaia DR2 2077726678964445696

System

Kepler-1985

Percentile among Sub-Neptune cohort

Radius 2.270 R⊕ · percentile 21 / cohort 1978

Mass 5.770 M⊕ · percentile 21 / cohort 1978

Orbital period 3.42 d · percentile 6 / cohort 1946

ESI 0.227 · percentile 11 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

3.421 days

Semi-major axis

0.0426 AU

Eccentricity

0.000

Inclination

82.03 °

Year Length

A year here lasts approximately 3.42 Earth days (0.9% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0426 AU.

Transit Fingerprint

Depth

0.036 %

Duration

1.767 h

Impact parameter b

0.920

Rp / R★

0.021524

Transit midpoint (BJD)

2,454,965.3063

Photometric dip

Transit produces a flux drop of 357 ppm lasting ≈ 1.77 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021524

Semi-major axis / stellar radius

6.630

Impact parameter (b)

0.920

Transit mid-time (BJD)

2,454,965.3063

Eq. Temperature

1,129K

(856 °C)

Insolation (S⊕)

382.68

Earth = 1.00

Earth Similarity (ESI)

0.227

0 = alien, 1 = Earth-identical

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

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-1985

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,370 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

0.966 R☉

Stellar Mass

0.877 M☉

Metallicity [Fe/H]

0.14

Extended Stellar Properties

Surface gravity (log g)

4.411 dex

Stellar density

0.472 g/cm³

Metallicity ratio

[Fe/H]