Key parameters at a glance

A radius of 0.62 Earth radii
A mass of 0.18 Earth masses
Surface gravity around 0.46 g
An orbital period of 2.378 days
Semi-major axis 0.0347 AU
Equilibrium temperature 1,278 K (1005 °C)
Distance from Earth 930.56 light-years
Earth Similarity Index 0.214
Travel time at Voyager 1 speed 16,410,464 years

Kepler-1877 b Planet Profile

Physical Specs

Radius

0.62 R⊕

Radius (Jupiter)

0.056 R♃

Mass

0.18 M⊕

Mass (Jupiter)

0.001 M♃

Density

4.05 g/cm³

Surface Gravity

0.46 g (Earth)

Classification

Planet Type

Rocky Terrestrial

ESI Score 0.214

HZ Position Inner

Controversial No

Discovery

Year 2021

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#546of 570

top 95.6%

This planet

0.62R⊕

Rocky Terrestrial median

1.01R⊕

Nearest-size peers

K2-89 b 0.62 R⊕ Barnard e 0.64 R⊕ KOI-1843.03 0.61 R⊕

Metric	Earth	Kepler-1877 b	Jupiter
Radius (R⊕)	1.00	0.62	11.21
Mass (M⊕)	1.00	0.18	317.83
Density (g/cm³)	5.51	4.05	1.33
Surface Gravity (g)	1.00	0.46	2.53
Insolation (S⊕)	1.00	691.10	0.037

Star Catalogue Identifiers

TIC

TIC 271355270

Gaia DR2

Gaia DR2 2128517003703948032

Gaia DR3

Gaia DR3 2128517003703948032

System

Kepler-1877

Percentile among Rocky Terrestrial cohort

Radius 0.624 R⊕ · percentile 4 / cohort 570

Mass 0.179 M⊕ · percentile 3 / cohort 570

Orbital period 2.38 d · percentile 27 / cohort 567

Distance 285.31 pc · percentile 39 / cohort 566

ESI 0.214 · percentile 16 / cohort 570

Orbit & Habitability

Orbital Dynamics

Period

2.378 days

Semi-major axis

0.0347 AU

Eccentricity

0.000

Inclination

88.09 °

Year Length

A year here lasts approximately 2.38 Earth days (0.7% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0347 AU.

Transit Fingerprint

Depth

0.003 %

Duration

2.263 h

Impact parameter b

0.231

Rp / R★

0.005303

Transit midpoint (BJD)

2,454,966.3975

Photometric dip

Transit produces a flux drop of 34 ppm lasting ≈ 2.26 h.

Extended Orbital Architecture

Planet / star radius ratio

0.005303

Semi-major axis / stellar radius

7.677

Impact parameter (b)

0.231

Transit mid-time (BJD)

2,454,966.3975

Angular separation (arcsec)

0.12200

Eq. Temperature

1,278K

(1005 °C)

Insolation (S⊕)

691.10

Earth = 1.00

Earth Similarity (ESI)

0.214

0 = alien, 1 = Earth-identical

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

Discovery Paper

Primary reference

Valizadegan et al. 2022

Instrument

Kepler CCD Array

Publication

2022-02

Observation locale

Space

Discovery cohort

Planets confirmed in 2021 at Kepler (12 shown).

Kepler-1816 b · Super-Earth Kepler-1705 c · Sub-Neptune Kepler-1948 b · Rocky Terrestrial Kepler-196 d · Sub-Neptune Kepler-1853 b · Super-Earth Kepler-1840 b · Sub-Neptune Kepler-1881 b · Sub-Neptune Kepler-1858 b · Sub-Neptune Kepler-1874 b · Sub-Neptune Kepler-1802 c · Sub-Neptune Kepler-1749 b · Super-Earth Kepler-1849 b · Sub-Neptune

Host System: Kepler-1877

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,615 K — cooler than the Sun (5,778 K)

Estimated Age

4.90 Gyr — older than the Sun (4.6 Gyr)

Stellar Radius

0.936 R☉

Stellar Mass

1.022 M☉

Metallicity [Fe/H]

0.24

Extended Stellar Properties

Surface gravity (log g)

4.505 dex

Stellar density

1.514 g/cm³

Metallicity ratio

[Fe/H]

Distance

285.31 parsec

Light-years 930.56 ly

V-band magnitude

12.29 mag

Voyager-speed travel 16,410,464 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

3.476 mas

Total Proper Motion

15.983 mas/yr

PM Right Ascension

7.07 mas/yr

PM Declination

-14.33 mas/yr

Galactic Cartesian (pc)

x = 0.288 · y = -0.621 · z = 0.729

Equatorial (J2000)

RA 294.86692° · Dec 46.79048°

Galactic ℓ, b

79.751° · 11.863°

Ecliptic λ, β

315.793° · 66.321°

HTM-20 index

-1079822422