Key parameters at a glance

A radius of 3.95 Earth radii
A mass of 14.80 Earth masses
Surface gravity around 0.95 g
An orbital period of 5.263 days
Semi-major axis 0.0612 AU
Equilibrium temperature 1,103 K (830 °C)
Distance from Earth 2,751.74 light-years
Earth Similarity Index 0.186
Travel time at Voyager 1 speed 48,526,973 years

Kepler-552 b Planet Profile

Physical Specs

Radius

3.95 R⊕

Radius (Jupiter)

0.352 R♃

Mass

14.80 M⊕

Mass (Jupiter)

0.047 M♃

Density

1.32 g/cm³

Surface Gravity

0.95 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.186

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

#9of 1978

top 0.4%

This planet

3.95R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-178 d 3.95 R⊕ K2-193 b 3.95 R⊕ Kepler-1719 b 3.95 R⊕

Metric	Earth	Kepler-552 b	Jupiter
Radius (R⊕)	1.00	3.95	11.21
Mass (M⊕)	1.00	14.80	317.83
Density (g/cm³)	5.51	1.32	1.33
Surface Gravity (g)	1.00	0.95	2.53
Insolation (S⊕)	1.00	358.99	0.037

Star Catalogue Identifiers

TIC

TIC 417659456

Gaia DR2

Gaia DR2 2129500383713365248

Gaia DR3

Gaia DR3 2129500383713365248

System

Kepler-552

Percentile among Sub-Neptune cohort

Radius 3.950 R⊕ · percentile 99 / cohort 1978

Mass 14.800 M⊕ · percentile 92 / cohort 1978

Orbital period 5.26 d · percentile 13 / cohort 1946

Distance 843.69 pc · percentile 68 / cohort 1975

ESI 0.186 · percentile 5 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

5.263 days

Semi-major axis

0.0612 AU

Eccentricity

0.000

Inclination

85.55 °

Year Length

A year here lasts approximately 5.26 Earth days (1.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0612 AU.

Transit Fingerprint

Depth

0.107 %

Duration

2.178 h

Impact parameter b

0.750

Rp / R★

0.034526

Transit midpoint (BJD)

2,455,007.3508

Photometric dip

Transit produces a flux drop of 1,067 ppm lasting ≈ 2.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.034526

Semi-major axis / stellar radius

13.800

Impact parameter (b)

0.750

Transit mid-time (BJD)

2,455,007.3508

Angular separation (arcsec)

0.07250

Eq. Temperature

1,103K

(830 °C)

Insolation (S⊕)

358.99

Earth = 1.00

Earth Similarity (ESI)

0.186

0 = alien, 1 = Earth-identical

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

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-552

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,863 K — hotter than the Sun (5,778 K)

Estimated Age

3.89 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.040 R☉

Stellar Mass

1.030 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.420 dex

Stellar density

0.784 g/cm³

Metallicity ratio

[Fe/H]

Distance

843.69 parsec

Light-years 2,751.74 ly

V-band magnitude

14.48 mag

Voyager-speed travel 48,526,973 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.157 mas

Total Proper Motion

3.913 mas/yr

PM Right Ascension

-2.50 mas/yr

PM Declination

-3.01 mas/yr

Galactic Cartesian (pc)

x = 0.236 · y = -0.623 · z = 0.746

Equatorial (J2000)

RA 290.74769° · Dec 48.24198°

Galactic ℓ, b

79.857° · 14.999°

Ecliptic λ, β

310.656° · 68.771°

HTM-20 index

-340855790