Key parameters at a glance

A radius of 3.02 Earth radii
A mass of 9.38 Earth masses
Surface gravity around 1.03 g
An orbital period of 225.583 days
Semi-major axis 0.7681 AU
Equilibrium temperature 348 K (75 °C)
Distance from Earth 3,845.41 light-years
Earth Similarity Index 0.621
Travel time at Voyager 1 speed 67,813,834 years

Kepler-1550 b Planet Profile

Physical Specs

Radius

3.02 R⊕

Radius (Jupiter)

0.269 R♃

Mass

9.38 M⊕

Mass (Jupiter)

0.030 M♃

Density

1.87 g/cm³

Surface Gravity

1.03 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.621

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

#502of 1978

top 25.3%

This planet

3.02R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-4010 b 3.02 R⊕ Kepler-248 b 3.02 R⊕ Kepler-1112 b 3.02 R⊕

Metric	Earth	Kepler-1550 b	Jupiter
Radius (R⊕)	1.00	3.02	11.21
Mass (M⊕)	1.00	9.38	317.83
Density (g/cm³)	5.51	1.87	1.33
Surface Gravity (g)	1.00	1.03	2.53
Insolation (S⊕)	1.00	2.31	0.037

Star Catalogue Identifiers

TIC

TIC 121395435

Gaia DR2

Gaia DR2 2099534293810509312

Gaia DR3

Gaia DR3 2099534293810509312

System

Kepler-1550

Percentile among Sub-Neptune cohort

Radius 3.020 R⊕ · percentile 74 / cohort 1978

Mass 9.380 M⊕ · percentile 68 / cohort 1978

Orbital period 225.58 d · percentile 99 / cohort 1946

Distance 1,179.01 pc · percentile 86 / cohort 1975

ESI 0.621 · percentile 85 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

225.583 days

Semi-major axis

0.7681 AU

Eccentricity

0.000

Inclination

89.98 °

Year Length

A year here lasts approximately 225.58 Earth days (61.8% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.7681 AU.

Transit Fingerprint

Depth

0.075 %

Duration

11.181 h

Impact parameter b

0.201

Rp / R★

0.025344

Transit midpoint (BJD)

2,455,105.7980

Photometric dip

Transit produces a flux drop of 755 ppm lasting ≈ 11.18 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025344

Semi-major axis / stellar radius

157.860

Impact parameter (b)

0.201

Transit mid-time (BJD)

2,455,105.7980

Angular separation (arcsec)

0.65100

Eq. Temperature

348K

(75 °C)

Insolation (S⊕)

2.31

Earth = 1.00

Earth Similarity (ESI)

0.621

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — 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-1550

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,991 K — hotter than the Sun (5,778 K)

Estimated Age

3.55 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.110 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

1.462 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,179.01 parsec

Light-years 3,845.41 ly

V-band magnitude

15.11 mag

Voyager-speed travel 67,813,834 yr

Multi-band Host Photometry — 17 bands

Astrometric Data

Parallax

0.820 mas

Total Proper Motion

7.048 mas/yr

PM Right Ascension

7.05 mas/yr

PM Declination

0.19 mas/yr

Galactic Cartesian (pc)

x = 0.239 · y = -0.747 · z = 0.620

Equatorial (J2000)

RA 287.76461° · Dec 38.29471°

Galactic ℓ, b

69.598° · 12.877°

Ecliptic λ, β

298.594° · 59.983°

HTM-20 index

-736722220