Key parameters at a glance

A radius of 1.57 Earth radii
A mass of 3.09 Earth masses
Surface gravity around 1.25 g
An orbital period of 4.168 days
Semi-major axis 0.0507 AU
Equilibrium temperature 1,277 K (1004 °C)
Distance from Earth 4,531.19 light-years
Earth Similarity Index 0.224
Travel time at Voyager 1 speed 79,907,486 years

Kepler-823 b Planet Profile

Physical Specs

Radius

1.57 R⊕

Radius (Jupiter)

0.140 R♃

Mass

3.09 M⊕

Mass (Jupiter)

0.010 M♃

Density

4.39 g/cm³

Surface Gravity

1.25 g (Earth)

Classification

Planet Type

Super-Earth

ESI Score 0.224

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

#618of 1176

top 52.5%

This planet

1.57R⊕

Super-Earth median

1.60R⊕

Nearest-size peers

Kepler-236 b 1.57 R⊕ Kepler-356 b 1.57 R⊕ Kepler-249 d 1.57 R⊕

Metric	Earth	Kepler-823 b	Jupiter
Radius (R⊕)	1.00	1.57	11.21
Mass (M⊕)	1.00	3.09	317.83
Density (g/cm³)	5.51	4.39	1.33
Surface Gravity (g)	1.00	1.25	2.53
Insolation (S⊕)	1.00	803.35	0.037

Star Catalogue Identifiers

TIC

TIC 120315151

Gaia DR2

Gaia DR2 2100216609495590912

Gaia DR3

Gaia DR3 2100216609495590912

System

Kepler-823

Percentile among Super-Earth cohort

Radius 1.570 R⊕ · percentile 47 / cohort 1176

Mass 3.090 M⊕ · percentile 42 / cohort 1176

Orbital period 4.17 d · percentile 33 / cohort 1164

Distance 1,389.27 pc · percentile 93 / cohort 1171

ESI 0.224 · percentile 18 / cohort 1176

Orbit & Habitability

Orbital Dynamics

Period

4.168 days

Semi-major axis

0.0507 AU

Eccentricity

0.000

Inclination

85.09 °

Year Length

A year here lasts approximately 4.17 Earth days (1.1% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0507 AU.

Transit Fingerprint

Depth

0.026 %

Duration

2.723 h

Impact parameter b

0.097

Rp / R★

0.015121

Transit midpoint (BJD)

2,454,967.8999

Photometric dip

Transit produces a flux drop of 263 ppm lasting ≈ 2.72 h.

Extended Orbital Architecture

Planet / star radius ratio

0.015121

Semi-major axis / stellar radius

11.831

Impact parameter (b)

0.097

Transit mid-time (BJD)

2,454,967.8999

Angular separation (arcsec)

0.03650

Eq. Temperature

1,277K

(1004 °C)

Insolation (S⊕)

803.35

Earth = 1.00

Earth Similarity (ESI)

0.224

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-823

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,643 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.960 R☉

Stellar Mass

0.980 M☉

Metallicity [Fe/H]

0.06

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.803 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,389.27 parsec

Light-years 4,531.19 ly

V-band magnitude

15.09 mag

Voyager-speed travel 79,907,486 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.691 mas

Total Proper Motion

7.747 mas/yr

PM Right Ascension

3.18 mas/yr

PM Declination

-7.06 mas/yr

Galactic Cartesian (pc)

x = 0.195 · y = -0.750 · z = 0.632

Equatorial (J2000)

RA 284.58257° · Dec 39.22017°

Galactic ℓ, b

69.449° · 15.521°

Ecliptic λ, β

294.080° · 61.446°

HTM-20 index

-379032038