Key parameters at a glance

A radius of 12.20 Earth radii
A mass of 5,085.25 Earth masses
Surface gravity around 34.17 g
An orbital period of 2,690.000 days
Semi-major axis 3.8000 AU
Distance from Earth 119.73 light-years
Earth Similarity Index 0.320
Travel time at Voyager 1 speed 2,111,356 years

HD 73256 c Planet Profile

Physical Specs

Radius

12.20 R⊕

Radius (Jupiter)

1.090 R♃

Mass

5,085.25 M⊕

Mass (Jupiter)

16.000 M♃

Density

15.40 g/cm³

Surface Gravity

34.17 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.320

HZ Position Unknown

Controversial No

Discovery

Year 2023

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#1410of 1771

top 79.6%

This planet

12.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

FU Tau b 12.20 R⊕ HD 168443 c 12.20 R⊕ HIP 5158 c 12.20 R⊕

Metric	Earth	HD 73256 c	Jupiter
Radius (R⊕)	1.00	12.20	11.21
Mass (M⊕)	1.00	5,085.25	317.83
Density (g/cm³)	5.51	15.40	1.33
Surface Gravity (g)	1.00	34.17	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	5,085.255 M⊕	Direct mass measurement (not derived).

Star Catalogue Identifiers

HD 73256

HIP

HIP 42214

TIC

TIC 11665403

Gaia DR2

Gaia DR2 5643762781311698048

Gaia DR3

Gaia DR3 5643762781311698048

System

HD 73256

Percentile among Gas Giant cohort

Radius 12.200 R⊕ · percentile 19 / cohort 1771

Mass 5,085.255 M⊕ · percentile 94 / cohort 1747

Orbital period 2,690.00 d · percentile 88 / cohort 1533

Distance 36.71 pc · percentile 11 / cohort 1759

ESI 0.320 · percentile 63 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,690.000 days

Semi-major axis

3.8000 AU

Eccentricity

0.160

Inclination

29.00 °

Year Length

A year here lasts about 7.36 Earth years on a mildly elliptical path at a mean orbital distance of 3.8000 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.320

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Philipot et al. 2023

Instrument

HARPS Spectrograph

Publication

2023-08

Observation locale

Ground

Discovery cohort

Planets confirmed in 2023 at La Silla Observatory (12 shown).

GJ 367 c · Super-Earth GJ 367 d · Sub-Neptune TOI-544 c · Neptune-like HD 74698 b · Neptune-like HD 75302 b · Gas Giant BD-210397 c · Gas Giant HD 108202 b · Gas Giant HIP 54597 b · Gas Giant HD 135625 b · Gas Giant HD 185283 b · Gas Giant BD-210397 b · Gas Giant HD 94771 b · Gas Giant

Host System: HD 73256

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,570 K — cooler than the Sun (5,778 K)

Estimated Age

2.20 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.945 R☉

Stellar Mass

1.000 M☉

Metallicity [Fe/H]

0.29

Extended Stellar Properties

Surface gravity (log g)

4.474 dex

Stellar density

1.622 g/cm³

Systemic radial velocity

29.73 km/s

Rotational v·sin i

3.50 km/s

Rotation period

13.97 days

Activity index (log R'HK)

-4.460

Metallicity ratio

[Fe/H]

Distance

36.71 parsec

Light-years 119.73 ly

V-band magnitude

8.08 mag

Voyager-speed travel 2,111,356 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

27.213 mas

Total Proper Motion

193.982 mas/yr

PM Right Ascension

-182.02 mas/yr

PM Declination

67.08 mas/yr

Galactic Cartesian (pc)

x = -0.546 · y = 0.672 · z = -0.501

Equatorial (J2000)

RA 129.09500° · Dec -30.03733°

Galactic ℓ, b

251.537° · 6.450°

Ecliptic λ, β

142.601° · -46.595°

HTM-20 index

-1515191837