Key parameters at a glance

A radius of 14.00 Earth radii
A mass of 127.13 Earth masses
Surface gravity around 0.65 g
An orbital period of 223.920 days
Semi-major axis 0.7710 AU
Distance from Earth 167.19 light-years
Earth Similarity Index 0.244
Travel time at Voyager 1 speed 2,948,410 years

2 siblings around HD 11506

HD 11506 c shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 11506 c this	Gas Giant	14.00	127.13	223.920	—	2008
HD 11506 b	Gas Giant	12.90	1,551.00	1,617.700	—	2007
HD 11506 d	Gas Giant	12.30	4,068.20	26,500.000	—	2022

HD 11506 c Planet Profile

Physical Specs

Radius

14.00 R⊕

Radius (Jupiter)

1.250 R♃

Mass

127.13 M⊕

Mass (Jupiter)

0.400 M♃

Density

0.26 g/cm³

Surface Gravity

0.65 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.244

HZ Position Unknown

Controversial No

Discovery

Year 2008

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#415of 1771

top 23.4%

This planet

14.00R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 9446 b 14.00 R⊕ HD 156411 b 14.00 R⊕ HD 224693 b 14.00 R⊕

Metric	Earth	HD 11506 c	Jupiter
Radius (R⊕)	1.00	14.00	11.21
Mass (M⊕)	1.00	127.13	317.83
Density (g/cm³)	5.51	0.26	1.33
Surface Gravity (g)	1.00	0.65	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	127.131 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 11506

HIP

HIP 8770

TIC

TIC 266680498

Gaia DR2

Gaia DR2 5137855525488932864

Gaia DR3

Gaia DR3 5137855525488932864

System

HD 11506

Percentile among Gas Giant cohort

Radius 14.000 R⊕ · percentile 74 / cohort 1771

Mass 127.131 M⊕ · percentile 9 / cohort 1747

Orbital period 223.92 d · percentile 58 / cohort 1533

Distance 51.26 pc · percentile 20 / cohort 1759

ESI 0.244 · percentile 42 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

223.920 days

Semi-major axis

0.7710 AU

Eccentricity

0.228

Inclination

— °

Year Length

A year here lasts approximately 223.92 Earth days (61.3% of a terrestrial year) on a mildly elliptical path at a mean orbital distance of 0.7710 AU.

Extended Orbital Architecture

RV semi-amplitude (K)

12.000 m/s

Transit mid-time (BJD)

2,453,212.0000

Long. of periastron (ω)

-120.00°

Angular separation (arcsec)

15.00000

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.244

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Tuomi Kotiranta 2009

Instrument

HIRES Spectrometer

Publication

2009-03

Observation locale

Ground

Discovery cohort

Planets confirmed in 2008 at W. M. Keck Observatory (7 shown).

HD 11964 c · Neptune-like HD 183263 c · Gas Giant HD 187123 c · Gas Giant HD 73534 b · Gas Giant HR 8799 d · Gas Giant HD 179079 b · Unclassified HD 7924 b · Unclassified

Host System: HD 11506

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

6,123 K — hotter than the Sun (5,778 K)

Estimated Age

2.50 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.240 R☉

Stellar Mass

1.220 M☉

Metallicity [Fe/H]

0.30

Extended Stellar Properties

Surface gravity (log g)

4.390 dex

Stellar density

0.641 g/cm³

Systemic radial velocity

-7.53 km/s

Rotational v·sin i

5.50 km/s

Rotation period

15.00 days

Activity index (log R'HK)

-5.060

Metallicity ratio

[Fe/H]

Distance

51.26 parsec

Light-years 167.19 ly

V-band magnitude

7.51 mag

Voyager-speed travel 2,948,410 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

19.479 mas

Total Proper Motion

100.159 mas/yr

PM Right Ascension

21.91 mas/yr

PM Declination

-97.73 mas/yr

Galactic Cartesian (pc)

x = 0.831 · y = 0.446 · z = -0.334

Equatorial (J2000)

RA 28.21066° · Dec -19.50740°

Galactic ℓ, b

187.759° · -73.995°

Ecliptic λ, β

18.376° · -28.922°

HTM-20 index

-891410030

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes