Key parameters at a glance

A radius of 5.92 Earth radii
A mass of 29.40 Earth masses
Surface gravity around 0.84 g
An orbital period of 24.812 days
Semi-major axis 0.1668 AU
Equilibrium temperature 631 K (358 °C)
Distance from Earth 3,204.10 light-years
Earth Similarity Index 0.277
Travel time at Voyager 1 speed 56,504,320 years

Kepler-1755 b Planet Profile

Physical Specs

Radius

5.92 R⊕

Radius (Jupiter)

0.528 R♃

Mass

29.40 M⊕

Mass (Jupiter)

0.092 M♃

Density

0.78 g/cm³

Surface Gravity

0.84 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.277

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#294of 574

top 51.0%

This planet

5.92R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

GJ 163 d 5.92 R⊕ HD 134060 c 5.91 R⊕ TOI-4010 c 5.93 R⊕

Metric	Earth	Kepler-1755 b	Jupiter
Radius (R⊕)	1.00	5.92	11.21
Mass (M⊕)	1.00	29.40	317.83
Density (g/cm³)	5.51	0.78	1.33
Surface Gravity (g)	1.00	0.84	2.53
Insolation (S⊕)	1.00	37.43	0.037

Star Catalogue Identifiers

TIC

TIC 239225129

Gaia DR2

Gaia DR2 2073715630497465856

Gaia DR3

Gaia DR3 2073715630497465856

System

Kepler-1755

Percentile among Neptune-like cohort

Radius 5.917 R⊕ · percentile 49 / cohort 574

Mass 29.400 M⊕ · percentile 48 / cohort 574

Orbital period 24.81 d · percentile 56 / cohort 524

Distance 982.38 pc · percentile 73 / cohort 572

ESI 0.277 · percentile 45 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

24.812 days

Semi-major axis

0.1668 AU

Eccentricity

0.000

Inclination

89.96 °

Year Length

A year here lasts approximately 24.81 Earth days (6.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1668 AU.

Transit Fingerprint

Depth

0.209 %

Duration

3.225 h

Impact parameter b

0.957

Rp / R★

0.041991

Transit midpoint (BJD)

2,454,989.5070

Photometric dip

Transit produces a flux drop of 2,091 ppm lasting ≈ 3.22 h.

Extended Orbital Architecture

Planet / star radius ratio

0.041991

Semi-major axis / stellar radius

61.210

Impact parameter (b)

0.957

Transit mid-time (BJD)

2,454,989.5070

Angular separation (arcsec)

0.17000

Eq. Temperature

631K

(358 °C)

Insolation (S⊕)

37.43

Earth = 1.00

Earth Similarity (ESI)

0.277

0 = alien, 1 = Earth-identical

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

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

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1755

Spectral Class

F-type yellow-white

Effective Temperature

6,086 K — hotter than the Sun (5,778 K)

Estimated Age

0.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.921 R☉

Stellar Mass

1.003 M☉

Metallicity [Fe/H]

-0.26

Extended Stellar Properties

Surface gravity (log g)

4.511 dex

Stellar density

7.047 g/cm³

Metallicity ratio

[Fe/H]

Distance

982.38 parsec

Light-years 3,204.10 ly

V-band magnitude

14.54 mag

Voyager-speed travel 56,504,320 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.990 mas

Total Proper Motion

20.018 mas/yr

PM Right Ascension

-13.61 mas/yr

PM Declination

-14.68 mas/yr

Galactic Cartesian (pc)

x = 0.345 · y = -0.682 · z = 0.645

Equatorial (J2000)

RA 296.84609° · Dec 40.13858°

Galactic ℓ, b

74.504° · 7.441°

Ecliptic λ, β

313.061° · 59.629°

HTM-20 index

-1279152221