Key parameters at a glance

A radius of 13.60 Earth radii
A mass of 411.59 Earth masses
Surface gravity around 2.23 g
An orbital period of 577.600 days
Semi-major axis 1.3010 AU
Distance from Earth 114.55 light-years
Earth Similarity Index 0.331
Travel time at Voyager 1 speed 2,020,047 years

1 sibling around HD 65216

HD 65216 b 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 65216 b this	Gas Giant	13.60	411.59	577.600	—	2003
HD 65216 c	Gas Giant	13.40	645.19	5,370.000	—	2013

HD 65216 b Planet Profile

Physical Specs

Radius

13.60 R⊕

Radius (Jupiter)

1.220 R♃

Mass

411.59 M⊕

Mass (Jupiter)

1.295 M♃

Density

0.90 g/cm³

Surface Gravity

2.23 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.331

HZ Position Unknown

Controversial No

Discovery

Year 2003

Method Radial Velocity

Facility La Silla Observatory

Telescope 1.2 m Leonhard Euler Telescope

Size rank in cohort

Rank by radius

#609of 1771

top 34.3%

This planet

13.60R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 19994 b 13.60 R⊕ HD 205739 b 13.60 R⊕ HD 79498 b 13.60 R⊕

Metric	Earth	HD 65216 b	Jupiter
Radius (R⊕)	1.00	13.60	11.21
Mass (M⊕)	1.00	411.59	317.83
Density (g/cm³)	5.51	0.90	1.33
Surface Gravity (g)	1.00	2.23	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	411.590 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 65216

HIP

HIP 38558

TIC

TIC 382625142

Gaia DR2

Gaia DR2 5287961677550103424

Gaia DR3

Gaia DR3 5287961677550103424

System

HD 65216

Percentile among Gas Giant cohort

Radius 13.600 R⊕ · percentile 63 / cohort 1771

Mass 411.590 M⊕ · percentile 43 / cohort 1747

Orbital period 577.60 d · percentile 70 / cohort 1533

Distance 35.12 pc · percentile 10 / cohort 1759

ESI 0.331 · percentile 65 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

577.600 days

Semi-major axis

1.3010 AU

Eccentricity

0.270

Inclination

— °

Year Length

A year here lasts about 1.58 Earth years on a mildly elliptical path at a mean orbital distance of 1.3010 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.331

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Mayor et al. 2004

Instrument

CORALIE Spectrograph

Publication

2004-02

Observation locale

Ground

Discovery cohort

Planets confirmed in 2003 at La Silla Observatory (11 shown).

HD 169830 c · Gas Giant HD 111232 b · Gas Giant HD 82943 c · Gas Giant HD 142415 b · Gas Giant HD 82943 b · Gas Giant HD 121504 b · Gas Giant HD 114386 b · Gas Giant HD 19994 b · Gas Giant HD 41004 B b · Gas Giant HD 216770 b · Gas Giant HD 6434 b · Gas Giant

Host System: HD 65216

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,612 K — cooler than the Sun (5,778 K)

Estimated Age

4.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

0.880 R☉

Stellar Mass

0.874 M☉

Metallicity [Fe/H]

-0.17

Extended Stellar Properties

Surface gravity (log g)

4.440 dex

Stellar density

2.023 g/cm³

Systemic radial velocity

42.67 km/s

Rotational v·sin i

1.00 km/s

Metallicity ratio

[M/H]

Distance

35.12 parsec

Light-years 114.55 ly

V-band magnitude

7.97 mag

Voyager-speed travel 2,020,047 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

28.445 mas

Total Proper Motion

191.755 mas/yr

PM Right Ascension

-123.63 mas/yr

PM Declination

146.58 mas/yr

Galactic Cartesian (pc)

x = -0.211 · y = 0.390 · z = -0.896

Equatorial (J2000)

RA 118.42096° · Dec -63.64669°

Galactic ℓ, b

276.274° · -17.614°

Ecliptic λ, β

179.521° · -77.802°

HTM-20 index

236945258

Observation Record

Photometric series

RV measurements

Archive notes