Key parameters at a glance

A radius of 13.50 Earth radii
A mass of 485.33 Earth masses
Surface gravity around 2.66 g
An orbital period of 1,211.170 days
Semi-major axis 2.3700 AU
Distance from Earth 306.12 light-years
Earth Similarity Index 0.344
Travel time at Voyager 1 speed 5,398,344 years

HD 23127 b Planet Profile

Physical Specs

Radius

13.50 R⊕

Radius (Jupiter)

1.210 R♃

Mass

485.33 M⊕

Mass (Jupiter)

1.527 M♃

Density

1.08 g/cm³

Surface Gravity

2.66 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.344

HZ Position Unknown

Controversial No

Discovery

Year 2006

Method Radial Velocity

Facility Anglo-Australian Telescope

Telescope 3.9 m Anglo-Australian Telescope

Size rank in cohort

Rank by radius

#671of 1771

top 37.8%

This planet

13.50R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 45350 b 13.50 R⊕ HD 82943 b 13.50 R⊕ HD 27442 b 13.50 R⊕

Metric	Earth	HD 23127 b	Jupiter
Radius (R⊕)	1.00	13.50	11.21
Mass (M⊕)	1.00	485.33	317.83
Density (g/cm³)	5.51	1.08	1.33
Surface Gravity (g)	1.00	2.66	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	485.326 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 23127

HIP

HIP 17054

TIC

TIC 311924816

Gaia DR2

Gaia DR2 4680773217379728128

Gaia DR3

Gaia DR3 4680773217379728128

System

HD 23127

Percentile among Gas Giant cohort

Radius 13.500 R⊕ · percentile 59 / cohort 1771

Mass 485.326 M⊕ · percentile 48 / cohort 1747

Orbital period 1,211.17 d · percentile 80 / cohort 1533

Distance 93.86 pc · percentile 34 / cohort 1759

ESI 0.344 · percentile 69 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

1,211.170 days

Semi-major axis

2.3700 AU

Eccentricity

0.406

Inclination

— °

Year Length

A year here lasts about 3.32 Earth years on a highly eccentric trajectory at a mean orbital distance of 2.3700 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.344

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

O Toole et al. 2007

Instrument

UCLES Spectrograph

Publication

2007-05

Observation locale

Ground

Discovery cohort

Planets confirmed in 2006 at Anglo-Australian Telescope (3 shown).

HD 159868 b · Gas Giant HD 20782 b · Gas Giant HD 187085 b · Gas Giant

Host System: HD 23127

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,843 K — hotter than the Sun (5,778 K)

Estimated Age

4.51 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.490 R☉

Stellar Mass

1.208 M☉

Metallicity [Fe/H]

0.29

Extended Stellar Properties

Surface gravity (log g)

4.146 dex

Stellar density

0.333 g/cm³

Systemic radial velocity

19.17 km/s

Rotational v·sin i

3.30 km/s

Rotation period

33.00 days

Metallicity ratio

[Fe/H]

Distance

93.86 parsec

Light-years 306.12 ly

V-band magnitude

8.58 mag

Voyager-speed travel 5,398,344 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

10.626 mas

Total Proper Motion

160.703 mas/yr

PM Right Ascension

73.62 mas/yr

PM Declination

142.85 mas/yr

Galactic Cartesian (pc)

x = 0.287 · y = 0.408 · z = -0.867

Equatorial (J2000)

RA 54.84913° · Dec -60.07723°

Galactic ℓ, b

273.942° · -46.484°

Ecliptic λ, β

5.852° · -73.220°

HTM-20 index

1209565935

Observation Record

Photometric series

RV measurements

Archive notes