Key parameters at a glance

A radius of 2.69 Earth radii
A mass of 7.70 Earth masses
Surface gravity around 1.06 g
An orbital period of 4.281 days
Semi-major axis 0.0503 AU
Equilibrium temperature 1,012 K (739 °C)
Distance from Earth 3,810.35 light-years
Earth Similarity Index 0.240
Travel time at Voyager 1 speed 67,195,520 years

Kepler-671 b Planet Profile

Physical Specs

Radius

2.69 R⊕

Radius (Jupiter)

0.240 R♃

Mass

7.70 M⊕

Mass (Jupiter)

0.024 M♃

Density

2.17 g/cm³

Surface Gravity

1.06 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.240

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

#881of 1978

top 44.5%

This planet

2.69R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1369 b 2.69 R⊕ Kepler-417 c 2.69 R⊕ HD 28109 b 2.69 R⊕

Metric	Earth	Kepler-671 b	Jupiter
Radius (R⊕)	1.00	2.69	11.21
Mass (M⊕)	1.00	7.70	317.83
Density (g/cm³)	5.51	2.17	1.33
Surface Gravity (g)	1.00	1.06	2.53
Insolation (S⊕)	1.00	331.44	0.037

Star Catalogue Identifiers

TIC

TIC 27084006

Gaia DR2

Gaia DR2 2135008387213331456

Gaia DR3

Gaia DR3 2135008387213331456

System

Kepler-671

Percentile among Sub-Neptune cohort

Radius 2.690 R⊕ · percentile 55 / cohort 1978

Mass 7.700 M⊕ · percentile 51 / cohort 1978

Orbital period 4.28 d · percentile 10 / cohort 1946

Distance 1,168.26 pc · percentile 85 / cohort 1975

ESI 0.240 · percentile 14 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

4.281 days

Semi-major axis

0.0503 AU

Eccentricity

0.000

Inclination

87.72 °

Year Length

A year here lasts approximately 4.28 Earth days (1.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0503 AU.

Transit Fingerprint

Depth

0.075 %

Duration

2.875 h

Impact parameter b

0.325

Rp / R★

0.025727

Transit midpoint (BJD)

2,455,004.8974

Photometric dip

Transit produces a flux drop of 751 ppm lasting ≈ 2.88 h.

Extended Orbital Architecture

Planet / star radius ratio

0.025727

Semi-major axis / stellar radius

11.090

Impact parameter (b)

0.325

Transit mid-time (BJD)

2,455,004.8974

Angular separation (arcsec)

0.04310

Eq. Temperature

1,012K

(739 °C)

Insolation (S⊕)

331.44

Earth = 1.00

Earth Similarity (ESI)

0.240

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-671

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,624 K — cooler than the Sun (5,778 K)

Estimated Age

4.47 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.950 R☉

Stellar Mass

0.970 M☉

Metallicity [Fe/H]

0.08

Extended Stellar Properties

Surface gravity (log g)

4.470 dex

Stellar density

1.245 g/cm³

Metallicity ratio

[Fe/H]

Distance

1,168.26 parsec

Light-years 3,810.35 ly

V-band magnitude

15.49 mag

Voyager-speed travel 67,195,520 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.828 mas

Total Proper Motion

7.428 mas/yr

PM Right Ascension

-1.11 mas/yr

PM Declination

-7.35 mas/yr

Galactic Cartesian (pc)

x = 0.268 · y = -0.594 · z = 0.758

Equatorial (J2000)

RA 294.26575° · Dec 49.31409°

Galactic ℓ, b

81.875° · 13.358°

Ecliptic λ, β

317.713° · 68.769°

HTM-20 index

-534069752