Key parameters at a glance

A radius of 13.70 Earth radii
A mass of 384.57 Earth masses
Surface gravity around 2.05 g
An orbital period of 119.270 days
Semi-major axis 0.5200 AU
Equilibrium temperature 405 K (132 °C)
Distance from Earth 97.78 light-years
Earth Similarity Index 0.332
Travel time at Voyager 1 speed 1,724,395 years

HD 52265 b Planet Profile

Physical Specs

Radius

13.70 R⊕

Radius (Jupiter)

1.220 R♃

Mass

384.57 M⊕

Mass (Jupiter)

1.210 M♃

Density

0.82 g/cm³

Surface Gravity

2.05 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.332

HZ Position Unknown

Controversial No

Discovery

Year 2000

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#554of 1771

top 31.2%

This planet

13.70R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 148164 b 13.70 R⊕ HD 114783 b 13.70 R⊕ HD 159243 b 13.70 R⊕

Metric	Earth	HD 52265 b	Jupiter
Radius (R⊕)	1.00	13.70	11.21
Mass (M⊕)	1.00	384.57	317.83
Density (g/cm³)	5.51	0.82	1.33
Surface Gravity (g)	1.00	2.05	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	384.574 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 52265

HIP

HIP 33719

TIC

TIC 268565917

Gaia DR2

Gaia DR2 3101382419728401408

Gaia DR3

Gaia DR3 3101382419728401408

System

HD 52265

Percentile among Gas Giant cohort

Radius 13.700 R⊕ · percentile 66 / cohort 1771

Mass 384.574 M⊕ · percentile 41 / cohort 1747

Orbital period 119.27 d · percentile 54 / cohort 1533

Distance 29.98 pc · percentile 7 / cohort 1759

ESI 0.332 · percentile 66 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

119.270 days

Semi-major axis

0.5200 AU

Eccentricity

0.270

Inclination

— °

Year Length

A year here lasts approximately 119.27 Earth days (32.7% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.5200 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

42.970 m/s

Transit mid-time (BJD)

2,456,393.4600

Long. of periastron (ω)

242.00°

Angular separation (arcsec)

17.30000

Eq. Temperature

405K

(132 °C)

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.332

0 = alien, 1 = Earth-identical

Insufficient insolation data — the surface is too hot to retain surface water.

Discovery Paper

Primary reference

Butler et al. 2000

Instrument

HIRES Spectrometer

Publication

2000-12

Observation locale

Ground

Discovery cohort

Planets confirmed in 2000 at W. M. Keck Observatory (4 shown).

HD 168443 c · Gas Giant HD 46375 b · Gas Giant HD 16141 b · Gas Giant BD-10 3166 b · Gas Giant

Host System: HD 52265

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,136 K — hotter than the Sun (5,778 K)

Estimated Age

3.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.320 R☉

Stellar Mass

1.204 M☉

Metallicity [Fe/H]

0.21

Extended Stellar Properties

Surface gravity (log g)

4.360 dex

Stellar density

0.571 g/cm³

Systemic radial velocity

53.92 km/s

Rotational v·sin i

5.20 km/s

Activity index (log R'HK)

-5.020

Metallicity ratio

[Fe/H]

Distance

29.98 parsec

Light-years 97.78 ly

V-band magnitude

6.29 mag

Voyager-speed travel 1,724,395 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

33.326 mas

Total Proper Motion

141.608 mas/yr

PM Right Ascension

-116.52 mas/yr

PM Declination

80.47 mas/yr

Galactic Cartesian (pc)

x = -0.259 · y = 0.961 · z = -0.094

Equatorial (J2000)

RA 105.07464° · Dec -5.36681°

Galactic ℓ, b

218.717° · -0.481°

Ecliptic λ, β

107.036° · -27.919°

HTM-20 index

1863092853

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes