Key parameters at a glance

A radius of 1.09 Earth radii
A mass of 1.32 Earth masses
Surface gravity around 1.11 g
An orbital period of 1.005 days
Semi-major axis 0.0194 AU
Equilibrium temperature 1,682 K (1409 °C)
Distance from Earth 2,736.70 light-years
Earth Similarity Index 0.177
Travel time at Voyager 1 speed 48,261,644 years

Kepler-1561 b Planet Profile

Physical Specs

Radius

1.09 R⊕

Radius (Jupiter)

0.097 R♃

Mass

1.32 M⊕

Mass (Jupiter)

0.004 M♃

Density

5.60 g/cm³

Surface Gravity

1.11 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.177

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

#240of 570

top 41.9%

This planet

1.09R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

TOI-5720 b 1.09 R⊕ Kepler-115 b 1.09 R⊕ Kepler-212 b 1.09 R⊕

Metric	Earth	Kepler-1561 b	Jupiter
Radius (R⊕)	1.00	1.09	11.21
Mass (M⊕)	1.00	1.32	317.83
Density (g/cm³)	5.51	5.60	1.33
Surface Gravity (g)	1.00	1.11	2.53
Insolation (S⊕)	1.00	2,364.81	0.037

Star Catalogue Identifiers

TIC

TIC 272716728

Gaia DR2

Gaia DR2 2078801009210349440

Gaia DR3

Gaia DR3 2078801009210349440

System

Kepler-1561

Percentile among Rocky Terrestrial cohort

Radius 1.090 R⊕ · percentile 56 / cohort 570

Mass 1.320 M⊕ · percentile 51 / cohort 570

Orbital period 1.01 d · percentile 12 / cohort 567

Distance 839.08 pc · percentile 87 / cohort 566

ESI 0.177 · percentile 10 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

1.005 days

Semi-major axis

0.0194 AU

Eccentricity

0.000

Inclination

88.34 °

Year Length

A year here lasts approximately 1.01 Earth days (0.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0194 AU.

Transit Fingerprint

Depth

0.010 %

Duration

1.620 h

Impact parameter b

0.137

Rp / R★

0.009453

Transit midpoint (BJD)

2,454,965.4553

Photometric dip

Transit produces a flux drop of 98 ppm lasting ≈ 1.62 h.

Extended Orbital Architecture

Planet / star radius ratio

0.009453

Semi-major axis / stellar radius

4.747

Impact parameter (b)

0.137

Transit mid-time (BJD)

2,454,965.4553

Angular separation (arcsec)

0.02310

Eq. Temperature

1,682K

(1409 °C)

Insolation (S⊕)

2,364.81

Earth = 1.00

Earth Similarity (ESI)

0.177

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the dayside is scorched.

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-1561

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,957 K — hotter than the Sun (5,778 K)

Estimated Age

3.39 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.110 R☉

Stellar Mass

1.070 M☉

Metallicity [Fe/H]

0.04

Extended Stellar Properties

Surface gravity (log g)

4.380 dex

Stellar density

2.003 g/cm³

Metallicity ratio

[Fe/H]

Distance

839.08 parsec

Light-years 2,736.70 ly

V-band magnitude

14.73 mag

Voyager-speed travel 48,261,644 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.164 mas

Total Proper Motion

1.470 mas/yr

PM Right Ascension

-0.54 mas/yr

PM Declination

1.37 mas/yr

Galactic Cartesian (pc)

x = 0.328 · y = -0.646 · z = 0.689

Equatorial (J2000)

RA 296.92358° · Dec 43.56646°

Galactic ℓ, b

77.555° · 9.065°

Ecliptic λ, β

315.838° · 62.786°

HTM-20 index

1535057216