Key parameters at a glance

A radius of 2.47 Earth radii
A mass of 6.66 Earth masses
Surface gravity around 1.09 g
An orbital period of 184.772 days
Semi-major axis 0.6011 AU
Equilibrium temperature 268 K (-5 °C)
Distance from Earth 2,508.45 light-years
Earth Similarity Index 0.734
Travel time at Voyager 1 speed 44,236,562 years

Kepler-1552 b Planet Profile

Physical Specs

Radius

2.47 R⊕

Radius (Jupiter)

0.220 R♃

Mass

6.66 M⊕

Mass (Jupiter)

0.021 M♃

Density

2.43 g/cm³

Surface Gravity

1.09 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.734

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

#1226of 1978

top 61.9%

This planet

2.47R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-263 c 2.47 R⊕ Kepler-1101 b 2.47 R⊕ Kepler-269 b 2.47 R⊕

Metric	Earth	Kepler-1552 b	Jupiter
Radius (R⊕)	1.00	2.47	11.21
Mass (M⊕)	1.00	6.66	317.83
Density (g/cm³)	5.51	2.43	1.33
Surface Gravity (g)	1.00	1.09	2.53
Insolation (S⊕)	1.00	1.85	0.037

Star Catalogue Identifiers

TIC

TIC 137319097

Gaia DR2

Gaia DR2 2052767528800649984

Gaia DR3

Gaia DR3 2052767528800649984

System

Kepler-1552

Percentile among Sub-Neptune cohort

Radius 2.470 R⊕ · percentile 37 / cohort 1978

Mass 6.660 M⊕ · percentile 35 / cohort 1978

Orbital period 184.77 d · percentile 98 / cohort 1946

Distance 769.10 pc · percentile 63 / cohort 1975

ESI 0.734 · percentile 95 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

184.772 days

Semi-major axis

0.6011 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 184.77 Earth days (50.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.6011 AU.

Transit Fingerprint

Depth

0.103 %

Duration

9.706 h

Impact parameter b

0.239

Rp / R★

0.029289

Transit midpoint (BJD)

2,455,050.3616

Photometric dip

Transit produces a flux drop of 1,035 ppm lasting ≈ 9.71 h.

Extended Orbital Architecture

Planet / star radius ratio

0.029289

Semi-major axis / stellar radius

151.500

Impact parameter (b)

0.239

Transit mid-time (BJD)

2,455,050.3616

Angular separation (arcsec)

0.78200

Eq. Temperature

268K

(-5 °C)

Insolation (S⊕)

1.85

Earth = 1.00

Earth Similarity (ESI)

0.734

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — surface water would be frozen.

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

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-1552

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,202 K — cooler than the Sun (5,778 K)

Estimated Age

3.31 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.780 R☉

Stellar Mass

0.850 M☉

Metallicity [Fe/H]

-0.07

Extended Stellar Properties

Surface gravity (log g)

4.580 dex

Stellar density

1.010 g/cm³

Metallicity ratio

[Fe/H]

Distance

769.10 parsec

Light-years 2,508.45 ly

V-band magnitude

15.20 mag

Voyager-speed travel 44,236,562 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.272 mas

Total Proper Motion

7.250 mas/yr

PM Right Ascension

7.00 mas/yr

PM Declination

1.87 mas/yr

Galactic Cartesian (pc)

x = 0.288 · y = -0.723 · z = 0.628

Equatorial (J2000)

RA 291.67687° · Dec 38.87492°

Galactic ℓ, b

71.480° · 10.368°

Ecliptic λ, β

304.773° · 59.724°

HTM-20 index

2037973619