Key parameters at a glance

A radius of 2.08 Earth radii
A mass of 4.98 Earth masses
Surface gravity around 1.15 g
An orbital period of 19.783 days
Semi-major axis 0.1422 AU
Equilibrium temperature 708 K (435 °C)
Distance from Earth 2,557.81 light-years
Earth Similarity Index 0.383
Travel time at Voyager 1 speed 45,107,033 years

Kepler-528 b Planet Profile

Physical Specs

Radius

2.08 R⊕

Radius (Jupiter)

0.186 R♃

Mass

4.98 M⊕

Mass (Jupiter)

0.016 M♃

Density

3.04 g/cm³

Surface Gravity

1.15 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.383

HZ Position Inner

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#1846of 1978

top 93.3%

This planet

2.08R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1195 b 2.08 R⊕ Kepler-405 b 2.08 R⊕ Kepler-237 c 2.08 R⊕

Metric	Earth	Kepler-528 b	Jupiter
Radius (R⊕)	1.00	2.08	11.21
Mass (M⊕)	1.00	4.98	317.83
Density (g/cm³)	5.51	3.04	1.33
Surface Gravity (g)	1.00	1.15	2.53
Insolation (S⊕)	1.00	68.97	0.037

Star Catalogue Identifiers

TIC

TIC 271877680

Gaia DR2

Gaia DR2 2080650559563974144

Gaia DR3

Gaia DR3 2080650559563974144

System

Kepler-528

Percentile among Sub-Neptune cohort

Radius 2.080 R⊕ · percentile 6 / cohort 1978

Mass 4.980 M⊕ · percentile 8 / cohort 1978

Orbital period 19.78 d · percentile 62 / cohort 1946

Distance 784.23 pc · percentile 65 / cohort 1975

ESI 0.383 · percentile 49 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

19.783 days

Semi-major axis

0.1422 AU

Eccentricity

0.000

Inclination

89.97 °

Year Length

A year here lasts approximately 19.78 Earth days (5.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1422 AU.

Transit Fingerprint

Depth

0.037 %

Duration

5.466 h

Impact parameter b

0.746

Rp / R★

0.017894

Transit midpoint (BJD)

2,455,010.7234

Photometric dip

Transit produces a flux drop of 373 ppm lasting ≈ 5.47 h.

Extended Orbital Architecture

Planet / star radius ratio

0.017894

Semi-major axis / stellar radius

28.010

Impact parameter (b)

0.746

Transit mid-time (BJD)

2,455,010.7234

Angular separation (arcsec)

0.18100

Eq. Temperature

708K

(435 °C)

Insolation (S⊕)

68.97

Earth = 1.00

Earth Similarity (ESI)

0.383

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

Morton et al. 2016

Instrument

Kepler CCD Array

Publication

2016-05

Observation locale

Space

Discovery cohort

Planets confirmed in 2016 at Kepler (12 shown).

Kepler-1512 b · Rocky Terrestrial Kepler-1410 b · Super-Earth Kepler-560 b · Super-Earth Kepler-1389 b · Super-Earth Kepler-1450 b · Super-Earth Kepler-1544 b · Super-Earth Kepler-1459 b · Super-Earth Kepler-1638 b · Super-Earth Kepler-737 b · Super-Earth Kepler-1185 b · Super-Earth Kepler-1178 b · Rocky Terrestrial Kepler-1040 b · Sub-Neptune

Host System: Kepler-528

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,807 K — hotter than the Sun (5,778 K)

Estimated Age

5.50 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

1.060 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.02

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

0.620 g/cm³

Systemic radial velocity

-60.39 km/s

Rotational v·sin i

4.50 km/s

Metallicity ratio

[Fe/H]

Distance

784.23 parsec

Light-years 2,557.81 ly

V-band magnitude

14.06 mag

Voyager-speed travel 45,107,033 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.246 mas

Total Proper Motion

13.174 mas/yr

PM Right Ascension

12.52 mas/yr

PM Declination

4.11 mas/yr

Galactic Cartesian (pc)

x = 0.291 · y = -0.606 · z = 0.740

Equatorial (J2000)

RA 295.68486° · Dec 47.74809°

Galactic ℓ, b

80.881° · 11.811°

Ecliptic λ, β

318.092° · 66.948°

HTM-20 index

-1743338197