Key parameters at a glance

A radius of 1.99 Earth radii
A mass of 4.63 Earth masses
Surface gravity around 1.17 g
An orbital period of 19.578 days
Semi-major axis 0.1940 AU
Equilibrium temperature 621 K (348 °C)
Distance from Earth 1,064.45 light-years
Earth Similarity Index 0.442
Travel time at Voyager 1 speed 18,771,561 years

Kepler-1928 b Planet Profile

Physical Specs

Radius

1.99 R⊕

Radius (Jupiter)

0.178 R♃

Mass

4.63 M⊕

Mass (Jupiter)

0.015 M♃

Density

3.22 g/cm³

Surface Gravity

1.17 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.442

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

#2of 1176

top 0.1%

This planet

1.99R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

TOI-733 b 1.99 R⊕ K2-62 c 1.99 R⊕ Kepler-243 c 1.99 R⊕

Metric	Earth	Kepler-1928 b	Jupiter
Radius (R⊕)	1.00	1.99	11.21
Mass (M⊕)	1.00	4.63	317.83
Density (g/cm³)	5.51	3.22	1.33
Surface Gravity (g)	1.00	1.17	2.53
Insolation (S⊕)	1.00	37.80	0.037

Star Catalogue Identifiers

TIC

TIC 122450696

Gaia DR2

Gaia DR2 2052827207364859264

Gaia DR3

Gaia DR3 2052827207364859264

System

Kepler-1928

Percentile among Super-Earth cohort

Radius 1.992 R⊕ · percentile 100 / cohort 1176

Mass 4.630 M⊕ · percentile 91 / cohort 1176

Orbital period 19.58 d · percentile 84 / cohort 1164

Distance 326.36 pc · percentile 34 / cohort 1171

ESI 0.442 · percentile 66 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

19.578 days

Semi-major axis

0.1940 AU

Eccentricity

0.430

Inclination

88.92 °

Year Length

A year here lasts approximately 19.58 Earth days (5.4% of a terrestrial year) on a highly eccentric trajectory at a mean orbital distance of 0.1940 AU.

Transit Fingerprint

Depth

0.043 %

Duration

2.300 h

Impact parameter b

0.550

Rp / R★

0.019840

Transit midpoint (BJD)

2,454,964.7149

Photometric dip

Transit produces a flux drop of 433 ppm lasting ≈ 2.30 h.

Extended Orbital Architecture

Planet / star radius ratio

0.019840

Semi-major axis / stellar radius

47.200

Impact parameter (b)

0.550

Transit mid-time (BJD)

2,454,964.7149

Long. of periastron (ω)

88.00°

Angular separation (arcsec)

0.59400

Eq. Temperature

621K

(348 °C)

Insolation (S⊕)

37.80

Earth = 1.00

Earth Similarity (ESI)

0.442

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. 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-1928

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,720 K — cooler than the Sun (5,778 K)

Estimated Age

0.10 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.920 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.12

Extended Stellar Properties

Surface gravity (log g)

4.533 dex

Stellar density

1.833 g/cm³

Systemic radial velocity

-26.79 km/s

Rotational v·sin i

10.40 km/s

Rotation period

4.69 days

Metallicity ratio

[Fe/H]

Distance

326.36 parsec

Light-years 1,064.45 ly

V-band magnitude

12.68 mag

Voyager-speed travel 18,771,561 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

3.035 mas

Total Proper Motion

4.843 mas/yr

PM Right Ascension

-4.22 mas/yr

PM Declination

2.37 mas/yr

Galactic Cartesian (pc)

x = 0.273 · y = -0.733 · z = 0.623

Equatorial (J2000)

RA 290.44063° · Dec 38.52357°

Galactic ℓ, b

70.724° · 11.078°

Ecliptic λ, β

302.742° · 59.661°

HTM-20 index

1886824610