Key parameters at a glance

A radius of 2.39 Earth radii
A mass of 9.70 Earth masses
Surface gravity around 1.70 g
An orbital period of 18.880 days
Semi-major axis 0.1242 AU
Equilibrium temperature 498 K (225 °C)
Distance from Earth 102.96 light-years
Earth Similarity Index 0.532
Travel time at Voyager 1 speed 1,815,635 years
Almost certainly tidally locked to its host star given the close orbit

1 sibling around HD 73583

HD 73583 c shares its host star with 1 other confirmed planet. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 73583 b	Sub-Neptune	2.79	10.20	6.398	714	2022
HD 73583 c this	Sub-Neptune	2.39	9.70	18.880	498	2022

HD 73583 c Planet Profile

Physical Specs

Radius

2.39 R⊕

Radius (Jupiter)

0.213 R♃

Mass

9.70 M⊕

Mass (Jupiter)

0.031 M♃

Density

3.88 g/cm³

Surface Gravity

1.70 g (Earth)

Classification

Planet Type

Sub-Neptune

ESI Score 0.532

HZ Position Inner

Controversial No

Discovery

Year 2022

Method Transit

Facility Transiting Exoplanet Survey Satellite (TESS)

Telescope 0.1 m TESS Telescope

Size rank in cohort

Rank by radius

#1343of 1978

top 67.8%

This planet

2.39R⊕

Sub-Neptune median

2.71R⊕

Nearest-size peers

Kepler-193 b 2.39 R⊕ Kepler-152 c 2.39 R⊕ Kepler-238 c 2.39 R⊕

Metric	Earth	HD 73583 c	Jupiter
Radius (R⊕)	1.00	2.39	11.21
Mass (M⊕)	1.00	9.70	317.83
Density (g/cm³)	5.51	3.88	1.33
Surface Gravity (g)	1.00	1.70	2.53
Insolation (S⊕)	1.00	10.20	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	9.700 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 73583

HIP

HIP 42401

TIC

TIC 101011575

Gaia DR2

Gaia DR2 5746824674801810816

Gaia DR3

Gaia DR3 5746824674801810816

System

HD 73583

Percentile among Sub-Neptune cohort

Radius 2.390 R⊕ · percentile 31 / cohort 1978

Mass 9.700 M⊕ · percentile 71 / cohort 1978

Orbital period 18.88 d · percentile 60 / cohort 1946

Distance 31.57 pc · percentile 8 / cohort 1975

ESI 0.532 · percentile 74 / cohort 1978

Orbit & Habitability

Orbital Dynamics

Period

18.880 days

Semi-major axis

0.1242 AU

Eccentricity

0.080

Inclination

89.72 °

Year Length

A year here lasts approximately 18.88 Earth days (5.2% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.1242 AU.

Transit Fingerprint

Depth

0.120 %

Duration

3.670 h

Impact parameter b

0.210

Rp / R★

0.033680

Transit midpoint (BJD)

2,459,232.1682

Photometric dip

Transit produces a flux drop of 1,199 ppm lasting ≈ 3.67 h.

Extended Orbital Architecture

Planet / star radius ratio

0.033680

Semi-major axis / stellar radius

41.110

Impact parameter (b)

0.210

RV semi-amplitude (K)

2.890 m/s

Transit mid-time (BJD)

2,459,232.1682

Long. of periastron (ω)

-41.60°

Angular separation (arcsec)

3.93000

Eq. Temperature

498K

(225 °C)

Insolation (S⊕)

10.20

Earth = 1.00

Earth Similarity (ESI)

0.532

0 = alien, 1 = Earth-identical

Inside the inner HZ boundary (too hot for liquid water) — the surface is too hot to retain surface water. Close-orbiting tidally-locked around a cool host.

Detection Signatures

Transit photometry

A transit dip has been observed from at least one telescope.

Radial velocity

Stellar wobble has been measured spectroscopically.

Discovery Paper

Primary reference

Barrag Aacute N et al. 2021

Instrument

TESS CCD Array

Publication

2021-10

Observation locale

Space

Discovery cohort

Planets confirmed in 2022 at Transiting Exoplanet Survey Satellite (TESS) (12 shown).

TOI-1452 b · Super-Earth TOI-712 d · Sub-Neptune TOI-1468 c · Sub-Neptune TOI-2136 b · Sub-Neptune LTT 1445 A c · Rocky Terrestrial TOI-712 c · Sub-Neptune LP 890-9 b · Super-Earth TOI-2081 b · Sub-Neptune GJ 3929 b · Rocky Terrestrial HD 260655 c · Super-Earth TOI-1759 b · Sub-Neptune TOI-1246 e · Sub-Neptune

Host System: HD 73583

Spectral Class

K-type orange

Effective Temperature

4,511 K — cooler than the Sun (5,778 K)

Estimated Age

0.48 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.650 R☉

Stellar Mass

0.730 M☉

Metallicity [Fe/H]

0.00

Extended Stellar Properties

Surface gravity (log g)

4.620 dex

Stellar density

3.690 g/cm³

Systemic radial velocity

21.52 km/s

Rotational v·sin i

3.50 km/s

Rotation period

12.20 days

Activity index (log R'HK)

-4.470

Metallicity ratio

[Fe/H]

Distance

31.57 parsec

Light-years 102.96 ly

V-band magnitude

9.67 mag

Voyager-speed travel 1,815,635 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

31.650 mas

Total Proper Motion

74.501 mas/yr

PM Right Ascension

-63.86 mas/yr

PM Declination

38.37 mas/yr

Galactic Cartesian (pc)

x = -0.622 · y = 0.749 · z = -0.229

Equatorial (J2000)

RA 129.68830° · Dec -13.25653°

Galactic ℓ, b

237.898° · 16.643°

Ecliptic λ, β

136.200° · -30.553°

HTM-20 index

701264442

Similar Worlds

Kepler-152 c

Sub-Neptune · K-type orange

Radius 2.39 R⊕ · 1,438.6 ly

TOI-1184 b

Sub-Neptune · K-type orange

Radius 2.39 R⊕ · 191.1 ly

TOI-1346 b

Sub-Neptune · K-type orange

Radius 2.39 R⊕ · 376.5 ly

HD 110067 c

Sub-Neptune · K-type orange

Radius 2.39 R⊕ · 104.9 ly

Kepler-1849 b

Sub-Neptune · K-type orange

Radius 2.39 R⊕ · 2,060.9 ly

HIP 113103 c

Sub-Neptune · K-type orange

Radius 2.40 R⊕ · 150.7 ly

Explore Related Categories

Sub-Neptune Planets Transit Discoveries Transiting Exoplanet Survey Satellite (TESS) Mission K-type orange Hosts