Key parameters at a glance

A radius of 2.90 Earth radii
A mass of 8.75 Earth masses
Surface gravity around 1.04 g
An orbital period of 198.089 days
Semi-major axis 0.5953 AU
Equilibrium temperature 288 K (15 °C)
Distance from Earth 3,088.20 light-years
Earth Similarity Index 0.725
Travel time at Voyager 1 speed 54,460,374 years

Kepler-1554 b Planet Profile

Physical Specs

Radius

2.90 R⊕

Radius (Jupiter)

0.259 R♃

Mass

8.75 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.97 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.725

HZ Position Habitable

Controversial No

Discovery

Year 2016

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#621of 1978

top 31.3%

This planet

2.90R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-130 c 2.90 R⊕ Kepler-276 c 2.90 R⊕ Kepler-314 c 2.90 R⊕

Metric	Earth	Kepler-1554 b	Jupiter
Radius (R⊕)	1.00	2.90	11.21
Mass (M⊕)	1.00	8.75	317.83
Density (g/cm³)	5.51	1.97	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	1.01	0.037

Star Catalogue Identifiers

TIC

TIC 120900025

Gaia DR2

Gaia DR2 2103927495598786304

Gaia DR3

Gaia DR3 2103927495598786304

System

Kepler-1554

Percentile among Sub-Neptune cohort

Radius 2.900 R⊕ · percentile 68 / cohort 1978

Mass 8.750 M⊕ · percentile 62 / cohort 1978

Orbital period 198.09 d · percentile 98 / cohort 1946

Distance 946.85 pc · percentile 75 / cohort 1975

ESI 0.725 · percentile 95 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

198.089 days

Semi-major axis

0.5953 AU

Eccentricity

0.000

Inclination

89.77 °

Year Length

A year here lasts approximately 198.09 Earth days (54.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.5953 AU.

Transit Fingerprint

Depth

0.103 %

Duration

8.121 h

Impact parameter b

0.455

Rp / R★

0.032815

Transit midpoint (BJD)

2,455,152.7306

Photometric dip

Transit produces a flux drop of 1,028 ppm lasting ≈ 8.12 h.

Extended Orbital Architecture

Planet / star radius ratio

0.032815

Semi-major axis / stellar radius

154.700

Impact parameter (b)

0.455

Transit mid-time (BJD)

2,455,152.7306

Angular separation (arcsec)

0.62900

Eq. Temperature

288K

(15 °C)

Insolation (S⊕)

1.01

Earth = 1.00

Earth Similarity (ESI)

0.725

0 = alien, 1 = Earth-identical

Within the conservative habitable zone — liquid water is physically possible with adequate atmospheric pressure.

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-1554

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,297 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.810 R☉

Stellar Mass

0.840 M☉

Metallicity [Fe/H]

-0.10

Extended Stellar Properties

Surface gravity (log g)

4.560 dex

Stellar density

1.850 g/cm³

Metallicity ratio

[Fe/H]

Distance

946.85 parsec

Light-years 3,088.20 ly

V-band magnitude

15.93 mag

Voyager-speed travel 54,460,374 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.028 mas

Total Proper Motion

28.364 mas/yr

PM Right Ascension

-21.53 mas/yr

PM Declination

18.47 mas/yr

Galactic Cartesian (pc)

x = 0.213 · y = -0.715 · z = 0.666

Equatorial (J2000)

RA 286.57602° · Dec 41.74158°

Galactic ℓ, b

72.468° · 15.102°

Ecliptic λ, β

298.542° · 63.547°

HTM-20 index

1211753711