Key parameters at a glance

A radius of 4.42 Earth radii
A mass of 17.90 Earth masses
Surface gravity around 0.92 g
An orbital period of 8.600 days
Semi-major axis 0.0747 AU
Equilibrium temperature 760 K (487 °C)
Distance from Earth 1,734.97 light-years
Earth Similarity Index 0.263
Travel time at Voyager 1 speed 30,596,146 years

Kepler-550 b Planet Profile

Physical Specs

Radius

4.42 R⊕

Radius (Jupiter)

0.394 R♃

Mass

17.90 M⊕

Mass (Jupiter)

0.056 M♃

Density

1.14 g/cm³

Surface Gravity

0.92 g (Earth)

Classification

Planet Type

Neptune-like

ESI Score 0.263

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

#472of 574

top 82.1%

This planet

4.42R⊕

Neptune-like median

6.39R⊕

Nearest-size peers

HD 99492 c 4.42 R⊕ OGLE-2015-BLG-1670L b 4.42 R⊕ Kepler-411 c 4.42 R⊕

Metric	Earth	Kepler-550 b	Jupiter
Radius (R⊕)	1.00	4.42	11.21
Mass (M⊕)	1.00	17.90	317.83
Density (g/cm³)	5.51	1.14	1.33
Surface Gravity (g)	1.00	0.92	2.53
Insolation (S⊕)	1.00	77.26	0.037

Star Catalogue Identifiers

TIC

TIC 273376082

Gaia DR2

Gaia DR2 2086414268238649984

Gaia DR3

Gaia DR3 2086414268238649984

System

Kepler-550

Percentile among Neptune-like cohort

Radius 4.420 R⊕ · percentile 17 / cohort 574

Mass 17.900 M⊕ · percentile 21 / cohort 574

Orbital period 8.60 d · percentile 33 / cohort 524

Distance 531.94 pc · percentile 58 / cohort 572

ESI 0.263 · percentile 41 / cohort 574

Orbit & Habitability

Orbital Dynamics

Period

8.600 days

Semi-major axis

0.0747 AU

Eccentricity

0.000

Inclination

89.84 °

Year Length

A year here lasts approximately 8.60 Earth days (2.4% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0747 AU.

Transit Fingerprint

Depth

0.295 %

Duration

4.025 h

Impact parameter b

0.027

Rp / R★

0.048662

Transit midpoint (BJD)

2,455,005.5286

Photometric dip

Transit produces a flux drop of 2,946 ppm lasting ≈ 4.03 h.

Extended Orbital Architecture

Planet / star radius ratio

0.048662

Semi-major axis / stellar radius

17.164

Impact parameter (b)

0.027

Transit mid-time (BJD)

2,455,005.5286

Angular separation (arcsec)

0.14000

Eq. Temperature

760K

(487 °C)

Insolation (S⊕)

77.26

Earth = 1.00

Earth Similarity (ESI)

0.263

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-550

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,322 K — cooler than the Sun (5,778 K)

Estimated Age

4.68 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.830 R☉

Stellar Mass

0.870 M☉

Metallicity [Fe/H]

-0.02

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

1.284 g/cm³

Systemic radial velocity

-13.78 km/s

Rotational v·sin i

4.10 km/s

Metallicity ratio

[Fe/H]

Distance

531.94 parsec

Light-years 1,734.97 ly

V-band magnitude

14.63 mag

Voyager-speed travel 30,596,146 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.851 mas

Total Proper Motion

10.816 mas/yr

PM Right Ascension

-3.42 mas/yr

PM Declination

-10.26 mas/yr

Galactic Cartesian (pc)

x = 0.312 · y = -0.594 · z = 0.742

Equatorial (J2000)

RA 297.70018° · Dec 47.86370°

Galactic ℓ, b

81.637° · 10.673°

Ecliptic λ, β

321.277° · 66.440°

HTM-20 index

1172015250