Key parameters at a glance

A radius of 3.36 Earth radii
A mass of 11.20 Earth masses
Surface gravity around 0.99 g
An orbital period of 20.500 days
Semi-major axis 0.1528 AU
Equilibrium temperature 731 K (458 °C)
Distance from Earth 6,738.32 light-years
Earth Similarity Index 0.308
Travel time at Voyager 1 speed 118,830,227 years

Kepler-1670 b Planet Profile

Physical Specs

Radius

3.36 R⊕

Radius (Jupiter)

0.299 R♃

Mass

11.20 M⊕

Mass (Jupiter)

0.035 M♃

Density

1.63 g/cm³

Surface Gravity

0.99 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.308

HZ Position Inner

Controversial No

Discovery

Year 2020

Method Transit

Facility Kepler

Telescope 0.95 m Kepler Telescope

Size rank in cohort

Rank by radius

#249of 1978

top 12.5%

This planet

3.36R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-1083 b 3.36 R⊕ Kepler-1057 b 3.36 R⊕ Kepler-1510 b 3.36 R⊕

Metric	Earth	Kepler-1670 b	Jupiter
Radius (R⊕)	1.00	3.36	11.21
Mass (M⊕)	1.00	11.20	317.83
Density (g/cm³)	5.51	1.63	1.33
Surface Gravity (g)	1.00	0.99	2.53
Insolation (S⊕)	1.00	67.67	0.037

Star Catalogue Identifiers

TIC

TIC 159375845

Gaia DR2

Gaia DR2 2102045097334800256

Gaia DR3

Gaia DR3 2102045097334800256

System

Kepler-1670

Percentile among Sub-Neptune cohort

Radius 3.356 R⊕ · percentile 87 / cohort 1978

Mass 11.200 M⊕ · percentile 81 / cohort 1978

Orbital period 20.50 d · percentile 63 / cohort 1946

Distance 2,065.98 pc · percentile 98 / cohort 1975

ESI 0.308 · percentile 30 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

20.500 days

Semi-major axis

0.1528 AU

Eccentricity

0.000

Inclination

84.41 °

Year Length

A year here lasts approximately 20.50 Earth days (5.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1528 AU.

Transit Fingerprint

Depth

0.044 %

Duration

6.501 h

Impact parameter b

0.887

Rp / R★

0.021292

Transit midpoint (BJD)

2,454,964.8207

Photometric dip

Transit produces a flux drop of 438 ppm lasting ≈ 6.50 h.

Extended Orbital Architecture

Planet / star radius ratio

0.021292

Semi-major axis / stellar radius

14.200

Impact parameter (b)

0.887

Transit mid-time (BJD)

2,454,964.8207

Angular separation (arcsec)

0.07400

Eq. Temperature

731K

(458 °C)

Insolation (S⊕)

67.67

Earth = 1.00

Earth Similarity (ESI)

0.308

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Armstrong et al. 2021

Instrument

Kepler CCD Array

Publication

2021-07

Observation locale

Space

Discovery cohort

Planets confirmed in 2020 at Kepler (12 shown).

Kepler-1649 c · Rocky Terrestrial Kepler-1701 b · Sub-Neptune Kepler-1690 b · Sub-Neptune Kepler-1700 b · Sub-Neptune Kepler-1684 b · Sub-Neptune Kepler-1678 b · Sub-Neptune Kepler-598 c · Sub-Neptune Kepler-1661 b · Sub-Neptune Kepler-1663 b · Sub-Neptune Kepler-1681 b · Sub-Neptune Kepler-1672 b · Sub-Neptune Kepler-1702 b · Super-Earth

Host System: Kepler-1670

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,838 K — hotter than the Sun (5,778 K)

Estimated Age

0.30 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.519 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

-0.08

Extended Stellar Properties

Surface gravity (log g)

4.096 dex

Stellar density

0.422 g/cm³

Metallicity ratio

[Fe/H]

Distance

2,065.98 parsec

Light-years 6,738.32 ly

V-band magnitude

15.74 mag

Voyager-speed travel 118,830,227 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

0.455 mas

Total Proper Motion

13.717 mas/yr

PM Right Ascension

-5.46 mas/yr

PM Declination

-12.58 mas/yr

Galactic Cartesian (pc)

x = 0.254 · y = -0.684 · z = 0.684

Equatorial (J2000)

RA 290.32646° · Dec 43.12176°

Galactic ℓ, b

74.931° · 13.136°

Ecliptic λ, β

305.449° · 64.080°

HTM-20 index

1057740965