Key parameters at a glance

A radius of 12.80 Earth radii
A mass of 1,913.64 Earth masses
Surface gravity around 11.68 g
An orbital period of 2,041.542 days
Semi-major axis 3.1660 AU
Equilibrium temperature 157 K (-117 °C)
Distance from Earth 286.38 light-years
Earth Similarity Index 0.330
Travel time at Voyager 1 speed 5,050,328 years

HD 95544 b Planet Profile

Physical Specs

Radius

12.80 R⊕

Radius (Jupiter)

1.140 R♃

Mass

1,913.64 M⊕

Mass (Jupiter)

6.021 M♃

Density

5.01 g/cm³

Surface Gravity

11.68 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.330

HZ Position Outer

Controversial No

Discovery

Year 2021

Method Radial Velocity

Facility Haute-Provence Observatory

Telescope 1.93 m Telescope

Size rank in cohort

Rank by radius

#1063of 1771

top 60.0%

This planet

12.80R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 240210 b 12.80 R⊕ HD 29985 b 12.80 R⊕ HD 148164 c 12.80 R⊕

Metric	Earth	HD 95544 b	Jupiter
Radius (R⊕)	1.00	12.80	11.21
Mass (M⊕)	1.00	1,913.64	317.83
Density (g/cm³)	5.51	5.01	1.33
Surface Gravity (g)	1.00	11.68	2.53
Insolation (S⊕)	1.00	0.10	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Best measured mass	1,913.645 M⊕	Direct mass measurement (not derived).
Minimum mass (M sin i)	2,173.946 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 95544

HIP

HIP 54203

TIC

TIC 156103616

Gaia DR2

Gaia DR2 1133573746387113856

Gaia DR3

Gaia DR3 1133573746387113856

System

HD 95544

Percentile among Gas Giant cohort

Radius 12.800 R⊕ · percentile 37 / cohort 1771

Mass 1,913.645 M⊕ · percentile 79 / cohort 1747

Orbital period 2,041.54 d · percentile 85 / cohort 1533

Distance 87.80 pc · percentile 32 / cohort 1759

ESI 0.330 · percentile 65 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2,041.542 days

Semi-major axis

3.1660 AU

Eccentricity

0.049

Inclination

86.50 °

Year Length

A year here lasts about 5.59 Earth years on a nearly circular orbit at a mean orbital distance of 3.1660 AU.

Extended Orbital Architecture

Semi-major axis / stellar radius

669.000

RV semi-amplitude (K)

95.359 m/s

Long. of periastron (ω)

151.53°

Angular separation (arcsec)

36.10000

Eq. Temperature

157K

(-117 °C)

Insolation (S⊕)

0.10

Earth = 1.00

Earth Similarity (ESI)

0.330

0 = alien, 1 = Earth-identical

Beyond the outer HZ boundary (too cold) — surface water would be frozen.

Detection Signatures

Radial velocity

Stellar wobble has been measured spectroscopically.

Astrometry

Positional wobble of the host star was measured.

Discovery Paper

Primary reference

Demangeon et al. 2021

Instrument

SOPHIE Spectrograph

Publication

2021-09

Observation locale

Ground

Discovery cohort

Planets confirmed in 2021 at Haute-Provence Observatory (11 shown).

HD 27969 b · Gas Giant HD 109286 b · Gas Giant HD 211403 b · Gas Giant HD 80869 b · Gas Giant BD+63 1405 b · Gas Giant HD 331093 b · Gas Giant BD+45 564 b · Gas Giant HD 115954 b · Gas Giant HD 124330 b · Gas Giant HD 155193 b · Gas Giant BD+55 362 b · Gas Giant

Host System: HD 95544

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,722 K — cooler than the Sun (5,778 K)

Estimated Age

—

Stellar Radius

1.088 R☉

Stellar Mass

1.010 M☉

Metallicity [Fe/H]

0.11

Extended Stellar Properties

Surface gravity (log g)

4.070 dex

Stellar density

0.246 g/cm³

Rotational v·sin i

3.30 km/s

Metallicity ratio

[Fe/H]

Distance

87.80 parsec

Light-years 286.38 ly

V-band magnitude

8.39 mag

Voyager-speed travel 5,050,328 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

11.360 mas

Total Proper Motion

218.714 mas/yr

PM Right Ascension

-213.86 mas/yr

PM Declination

-45.82 mas/yr

Galactic Cartesian (pc)

x = -0.151 · y = 0.037 · z = 0.988

Equatorial (J2000)

RA 166.32318° · Dec 81.03899°

Galactic ℓ, b

127.809° · 35.060°

Ecliptic λ, β

109.525° · 63.079°

HTM-20 index

761787417