Key parameters at a glance

A radius of 2.94 Earth radii
A mass of 8.93 Earth masses
Surface gravity around 1.04 g
An orbital period of 33.789 days
Semi-major axis 0.2136 AU
Equilibrium temperature 611 K (338 °C)
Distance from Earth 2,371.76 light-years
Earth Similarity Index 0.388
Travel time at Voyager 1 speed 41,826,056 years

Kepler-1673 b Planet Profile

Physical Specs

Radius

2.94 R⊕

Radius (Jupiter)

0.262 R♃

Mass

8.93 M⊕

Mass (Jupiter)

0.028 M♃

Density

1.94 g/cm³

Surface Gravity

1.04 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.388

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

#582of 1978

top 29.4%

This planet

2.94R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

TOI-4638.01 2.93 R⊕ Kepler-1731 b 2.93 R⊕ TOI-178 g 2.94 R⊕

Metric	Earth	Kepler-1673 b	Jupiter
Radius (R⊕)	1.00	2.94	11.21
Mass (M⊕)	1.00	8.93	317.83
Density (g/cm³)	5.51	1.94	1.33
Surface Gravity (g)	1.00	1.04	2.53
Insolation (S⊕)	1.00	30.50	0.037

Star Catalogue Identifiers

TIC

TIC 377782148

Gaia DR2

Gaia DR2 2131922985785232640

Gaia DR3

Gaia DR3 2131922985785232640

System

Kepler-1673

Percentile among Sub-Neptune cohort

Radius 2.936 R⊕ · percentile 71 / cohort 1978

Mass 8.930 M⊕ · percentile 65 / cohort 1978

Orbital period 33.79 d · percentile 76 / cohort 1946

Distance 727.19 pc · percentile 61 / cohort 1975

ESI 0.388 · percentile 50 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

33.789 days

Semi-major axis

0.2136 AU

Eccentricity

0.000

Inclination

89.91 °

Year Length

A year here lasts approximately 33.79 Earth days (9.3% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.2136 AU.

Transit Fingerprint

Depth

0.061 %

Duration

5.479 h

Impact parameter b

0.078

Rp / R★

0.023154

Transit midpoint (BJD)

2,454,986.6550

Photometric dip

Transit produces a flux drop of 613 ppm lasting ≈ 5.48 h.

Extended Orbital Architecture

Planet / star radius ratio

0.023154

Semi-major axis / stellar radius

47.920

Impact parameter (b)

0.078

Transit mid-time (BJD)

2,454,986.6550

Angular separation (arcsec)

0.29400

Eq. Temperature

611K

(338 °C)

Insolation (S⊕)

30.50

Earth = 1.00

Earth Similarity (ESI)

0.388

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-1673

Spectral Class

F-type yellow-white

Effective Temperature

6,015 K — hotter than the Sun (5,778 K)

Estimated Age

1.62 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.132 R☉

Stellar Mass

1.110 M☉

Metallicity [Fe/H]

0.23

Extended Stellar Properties

Surface gravity (log g)

4.376 dex

Stellar density

1.080 g/cm³

Metallicity ratio

[M/H]

Distance

727.19 parsec

Light-years 2,371.76 ly

V-band magnitude

13.78 mag

Voyager-speed travel 41,826,056 yr

Multi-band Host Photometry — 16 bands

Astrometric Data

Parallax

1.346 mas

Total Proper Motion

3.910 mas/yr

PM Right Ascension

1.94 mas/yr

PM Declination

3.39 mas/yr

Galactic Cartesian (pc)

x = 0.178 · y = -0.635 · z = 0.751

Equatorial (J2000)

RA 285.66717° · Dec 48.71959°

Galactic ℓ, b

78.982° · 18.295°

Ecliptic λ, β

302.108° · 70.417°

HTM-20 index

-244580080