Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 118.55 Earth masses
Surface gravity around 0.65 g
An orbital period of 65.940 days
Semi-major axis 0.3388 AU
Distance from Earth 115.00 light-years
Earth Similarity Index 0.250
Travel time at Voyager 1 speed 2,028,071 years

2 siblings around HD 73344

HD 73344 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 73344 b	Sub-Neptune	2.88	10.48	15.611	911	2024
HD 73344 c this	Gas Giant	13.50	118.55	65.940	—	2025
HD 73344 d	Gas Giant	13.20	810.46	5,823.000	—	2025

HD 73344 c Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.200 R♃

Mass

118.55 M⊕

Mass (Jupiter)

0.373 M♃

Density

0.27 g/cm³

Surface Gravity

0.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.250

HZ Position Unknown

Controversial No

Discovery

Year 2025

Method Radial Velocity

Facility Multiple Observatories

Telescope Multiple Telescopes

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 73344 c	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	118.55	317.83
Density (g/cm³)	5.51	0.27	1.33
Surface Gravity (g)	1.00	0.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	118.550 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 73344

HIP

HIP 42403

TIC

TIC 175193677

Gaia DR2

Gaia DR2 666427539629086976

Gaia DR3

Gaia DR3 666427539629086976

System

HD 73344

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 118.550 M⊕ · percentile 8 / cohort 1747

Orbital period 65.94 d · percentile 52 / cohort 1533

Distance 35.26 pc · percentile 11 / cohort 1759

ESI 0.250 · percentile 45 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

65.940 days

Semi-major axis

0.3388 AU

Eccentricity

0.124

Inclination

— °

Year Length

A year here lasts approximately 65.94 Earth days (18.1% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.3388 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

16.360 m/s

Transit mid-time (BJD)

2,455,482.9800

Long. of periastron (ω)

112.00°

Angular separation (arcsec)

9.61000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.250

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Zhang et al. 2024

Instrument

Multiple Instruments

Publication

2024-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2025 at Multiple Observatories (12 shown).

Gl 725 A b · Super-Earth HD 20794 f · Sub-Neptune GJ 3998 d · Sub-Neptune GJ 251 c · Super-Earth HD 86728 b · Sub-Neptune TOI-2015 c · Sub-Neptune Kepler-139 f · Neptune-like HD 73344 d · Gas Giant TOI-1472 c · Sub-Neptune TOI-6695 c · Gas Giant AT2021ueyL b · Gas Giant HIP 111909 b · Gas Giant

Host System: HD 73344

Spectral Class

F-type yellow-white

Effective Temperature

6,148 K — hotter than the Sun (5,778 K)

Estimated Age

1.15 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.220 R☉

Stellar Mass

1.190 M☉

Metallicity [Fe/H]

0.16

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

1.014 g/cm³

Systemic radial velocity

5.80 km/s

Rotational v·sin i

5.67 km/s

Rotation period

9.03 days

Activity index (log R'HK)

-4.600

Metallicity ratio

[Fe/H]

Distance

35.26 parsec

Light-years 115.00 ly

V-band magnitude

6.89 mag

Voyager-speed travel 2,028,071 yr

Multi-band Host Photometry — 12 bands

Astrometric Data

Parallax

28.332 mas

Total Proper Motion

156.117 mas/yr

PM Right Ascension

-47.30 mas/yr

PM Declination

-148.78 mas/yr

Galactic Cartesian (pc)

x = -0.585 · y = 0.705 · z = 0.402

Equatorial (J2000)

RA 129.68945° · Dec 23.68527°

Galactic ℓ, b

201.244° · 33.438°

Ecliptic λ, β

125.949° · 5.063°

HTM-20 index

-463656631