Key parameters at a glance

A radius of 2.66 Earth radii
A mass of 7.56 Earth masses
Surface gravity around 1.07 g
An orbital period of 24.497 days
Semi-major axis 0.1772 AU
Equilibrium temperature 722 K (449 °C)
Distance from Earth 4,774.01 light-years
Earth Similarity Index 0.343
Travel time at Voyager 1 speed 84,189,672 years

Kepler-1551 b Planet Profile

Physical Specs

Radius

2.66 R⊕

Radius (Jupiter)

0.237 R♃

Mass

7.56 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.21 g/cm³

Surface Gravity

1.07 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.343

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

#928of 1978

top 46.9%

This planet

2.66R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-346 b 2.66 R⊕ KOI-351 e 2.66 R⊕ Kepler-1987 d 2.66 R⊕

Metric	Earth	Kepler-1551 b	Jupiter
Radius (R⊕)	1.00	2.66	11.21
Mass (M⊕)	1.00	7.56	317.83
Density (g/cm³)	5.51	2.21	1.33
Surface Gravity (g)	1.00	1.07	2.53
Insolation (S⊕)	1.00	60.42	0.037

Star Catalogue Identifiers

TIC

TIC 184164411

Gaia DR2

Gaia DR2 2076325527501566208

Gaia DR3

Gaia DR3 2076325527501566208

System

Kepler-1551

Percentile among Sub-Neptune cohort

Radius 2.660 R⊕ · percentile 52 / cohort 1978

Mass 7.560 M⊕ · percentile 48 / cohort 1978

Orbital period 24.50 d · percentile 69 / cohort 1946

Distance 1,463.72 pc · percentile 92 / cohort 1975

ESI 0.343 · percentile 39 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

24.497 days

Semi-major axis

0.1772 AU

Eccentricity

0.000

Inclination

87.79 °

Year Length

A year here lasts approximately 24.50 Earth days (6.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1772 AU.

Transit Fingerprint

Depth

0.045 %

Duration

5.081 h

Impact parameter b

0.502

Rp / R★

0.020475

Transit midpoint (BJD)

2,454,966.9231

Photometric dip

Transit produces a flux drop of 449 ppm lasting ≈ 5.08 h.

Extended Orbital Architecture

Planet / star radius ratio

0.020475

Semi-major axis / stellar radius

21.200

Impact parameter (b)

0.502

Transit mid-time (BJD)

2,454,966.9231

Angular separation (arcsec)

0.12100

Eq. Temperature

722K

(449 °C)

Insolation (S⊕)

60.42

Earth = 1.00

Earth Similarity (ESI)

0.343

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-1551

Spectral Class

F-type yellow-white

Effective Temperature

6,136 K — hotter than the Sun (5,778 K)

Estimated Age

2.88 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.220 R☉

Stellar Mass

1.140 M☉

Metallicity [Fe/H]

0.01

Extended Stellar Properties

Surface gravity (log g)

4.320 dex

Stellar density

1.106 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,463.72 parsec

Light-years 4,774.01 ly

V-band magnitude

15.37 mag

Voyager-speed travel 84,189,672 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.655 mas

Total Proper Motion

3.206 mas/yr

PM Right Ascension

1.61 mas/yr

PM Declination

-2.77 mas/yr

Galactic Cartesian (pc)

x = 0.334 · y = -0.691 · z = 0.642

Equatorial (J2000)

RA 295.78552° · Dec 39.90790°

Galactic ℓ, b

73.902° · 8.038°

Ecliptic λ, β

311.395° · 59.696°

HTM-20 index

-1230269750