Key parameters at a glance

A radius of 0.89 Earth radii
A mass of 0.64 Earth masses
Surface gravity around 0.81 g
An orbital period of 0.770 days
Semi-major axis 0.0156 AU
Equilibrium temperature 1,650 K (1377 °C)
Distance from Earth 1,229.80 light-years
Earth Similarity Index 0.177
Travel time at Voyager 1 speed 21,687,589 years

Kepler-1173 b Planet Profile

Physical Specs

Radius

0.89 R⊕

Radius (Jupiter)

0.079 R♃

Mass

0.64 M⊕

Mass (Jupiter)

0.002 M♃

Density

4.99 g/cm³

Surface Gravity

0.81 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

#418of 570

top 73.2%

This planet

0.89R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

Kepler-353 b 0.89 R⊕ Kepler-387 c 0.89 R⊕ Kepler-303 b 0.89 R⊕

Metric	Earth	Kepler-1173 b	Jupiter
Radius (R⊕)	1.00	0.89	11.21
Mass (M⊕)	1.00	0.64	317.83
Density (g/cm³)	5.51	4.99	1.33
Surface Gravity (g)	1.00	0.81	2.53
Insolation (S⊕)	1.00	1,462.10	0.037

Star Catalogue Identifiers

TIC

TIC 275490034

Gaia DR2

Gaia DR2 2128039304560957952

Gaia DR3

Gaia DR3 2128039304560957952

System

Kepler-1173

Percentile among Rocky Terrestrial cohort

Radius 0.890 R⊕ · percentile 25 / cohort 570

Mass 0.640 M⊕ · percentile 21 / cohort 570

Orbital period 0.77 d · percentile 8 / cohort 567

Distance 377.06 pc · percentile 49 / cohort 566

ESI 0.177 · percentile 10 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

0.770 days

Semi-major axis

0.0156 AU

Eccentricity

0.000

Inclination

80.42 °

Year Length

A year here lasts roughly 18.5 hours long on a nearly circular orbit at a mean orbital distance of 0.0156 AU.

Transit Fingerprint

Depth

0.011 %

Duration

1.028 h

Impact parameter b

0.614

Rp / R★

0.010143

Transit midpoint (BJD)

2,454,965.5214

Photometric dip

Transit produces a flux drop of 110 ppm lasting ≈ 1.03 h.

Extended Orbital Architecture

Planet / star radius ratio

0.010143

Semi-major axis / stellar radius

4.660

Impact parameter (b)

0.614

Transit mid-time (BJD)

2,454,965.5214

Angular separation (arcsec)

0.04140

Eq. Temperature

1,650K

(1377 °C)

Insolation (S⊕)

1,462.10

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-1173

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,252 K — cooler than the Sun (5,778 K)

Estimated Age

4.79 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.820 R☉

Stellar Mass

0.860 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.550 dex

Stellar density

1.800 g/cm³

Metallicity ratio

[Fe/H]

Distance

377.06 parsec

Light-years 1,229.80 ly

V-band magnitude

13.90 mag

Voyager-speed travel 21,687,589 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

2.623 mas

Total Proper Motion

31.585 mas/yr

PM Right Ascension

13.55 mas/yr

PM Declination

-28.53 mas/yr

Galactic Cartesian (pc)

x = 0.275 · y = -0.643 · z = 0.715

Equatorial (J2000)

RA 293.13118° · Dec 45.66342°

Galactic ℓ, b

78.169° · 12.429°

Ecliptic λ, β

311.974° · 65.765°

HTM-20 index

-1560163195