Key parameters at a glance

A radius of 14.20 Earth radii
A mass of 162.09 Earth masses
Surface gravity around 0.80 g
An orbital period of 2.246 days
Semi-major axis 0.0300 AU
Distance from Earth 176.88 light-years
Earth Similarity Index 0.255
Travel time at Voyager 1 speed 3,119,203 years

HD 212301 b Planet Profile

Physical Specs

Radius

14.20 R⊕

Radius (Jupiter)

1.270 R♃

Mass

162.09 M⊕

Mass (Jupiter)

0.510 M♃

Density

0.31 g/cm³

Surface Gravity

0.80 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.255

HZ Position Unknown

Controversial No

Discovery

Year 2005

Method Radial Velocity

Facility La Silla Observatory

Telescope 3.6 m ESO Telescope

Size rank in cohort

Rank by radius

#334of 1771

top 18.8%

This planet

14.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

OGLE-2011-BLG-0251L b 14.20 R⊕ HIP 57274 c 14.20 R⊕ HD 187123 b 14.20 R⊕

Metric	Earth	HD 212301 b	Jupiter
Radius (R⊕)	1.00	14.20	11.21
Mass (M⊕)	1.00	162.09	317.83
Density (g/cm³)	5.51	0.31	1.33
Surface Gravity (g)	1.00	0.80	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	162.093 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 212301

HIP

HIP 110852

TIC

TIC 317057430

Gaia DR2

Gaia DR2 6356860393345181824

Gaia DR3

Gaia DR3 6356860393345181824

System

HD 212301

Percentile among Gas Giant cohort

Radius 14.200 R⊕ · percentile 79 / cohort 1771

Mass 162.093 M⊕ · percentile 14 / cohort 1747

Orbital period 2.25 d · percentile 9 / cohort 1533

Distance 54.23 pc · percentile 22 / cohort 1759

ESI 0.255 · percentile 46 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

2.246 days

Semi-major axis

0.0300 AU

Eccentricity

0.000

Inclination

— °

Year Length

A year here lasts approximately 2.25 Earth days (0.6% of a terrestrial year) on a nearly circular orbit at a mean orbital distance of 0.0300 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.255

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Lo Curto et al. 2006

Instrument

HARPS Spectrograph

Publication

2006-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2005 at La Silla Observatory (10 shown).

HD 4308 b · Neptune-like GJ 581 b · Neptune-like HD 11977 b · Gas Giant HD 142022 A b · Gas Giant HD 102117 b · Neptune-like HD 101930 b · Gas Giant HD 27894 b · Gas Giant HD 93083 b · Gas Giant HD 63454 b · Gas Giant HD 2638 b · Gas Giant

Host System: HD 212301

Spectral Class

F-type yellow-white

Effective Temperature

6,239 K — hotter than the Sun (5,778 K)

Estimated Age

1.00 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.160 R☉

Stellar Mass

1.550 M☉

Metallicity [Fe/H]

0.18

Extended Stellar Properties

Surface gravity (log g)

4.500 dex

Stellar density

1.083 g/cm³

Systemic radial velocity

4.87 km/s

Rotational v·sin i

7.00 km/s

Metallicity ratio

[Fe/H]

Distance

54.23 parsec

Light-years 176.88 ly

V-band magnitude

7.76 mag

Voyager-speed travel 3,119,203 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

18.411 mas

Total Proper Motion

120.038 mas/yr

PM Right Ascension

76.86 mas/yr

PM Declination

-92.20 mas/yr

Galactic Cartesian (pc)

x = 0.196 · y = -0.084 · z = -0.977

Equatorial (J2000)

RA 336.88040° · Dec -77.71832°

Galactic ℓ, b

311.908° · -36.780°

Ecliptic λ, β

292.800° · -59.685°

HTM-20 index

1236157305

Observation Record

Photometric series

RV measurements

Archive notes